Добавление кода проекта

WinFormsApp2/.vs/WinFormsApp2/v17/DocumentLayout.backup.json

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+            {
+              "$type": "Document",
+              "DocumentIndex": 1,
+              "Title": "DbConnection.cs",
+              "DocumentMoniker": "C:\\Users\\vlade\\Desktop\\\u043F\u0440\u0430\u043A\u0442\u0438\u043A\u0430\\WinFormsApp2\\WinFormsApp2\\DbConnection.cs",
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+              "ToolTip": "C:\\Users\\vlade\\Desktop\\\u043F\u0440\u0430\u043A\u0442\u0438\u043A\u0430\\WinFormsApp2\\WinFormsApp2\\DbConnection.cs",
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+            {
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+              "WhenOpened": "2026-06-03T16:43:50.91Z"
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+        {
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+          "SelectedChildIndex": -1,
+          "Children": [
+            {
+              "$type": "Bookmark",
+              "Name": "ST:0:0:{34e76e81-ee4a-11d0-ae2e-00a0c90fffc3}"
+            }
+          ]
+        }
+      ]
+    }
+  ]
+}

WinFormsApp2/WinFormsApp2.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36811.4 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WinFormsApp2", "WinFormsApp2\WinFormsApp2.csproj", "{07C80FE2-991B-4C74-9D8F-FEB2098EA442}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{07C80FE2-991B-4C74-9D8F-FEB2098EA442}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{07C80FE2-991B-4C74-9D8F-FEB2098EA442}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{07C80FE2-991B-4C74-9D8F-FEB2098EA442}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{07C80FE2-991B-4C74-9D8F-FEB2098EA442}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {B2BB366F-6CFE-4149-BA37-FF4905E6DA42}
+	EndGlobalSection
+EndGlobal

WinFormsApp2/WinFormsApp2/DbConnection.cs

@@ -0,0 +1,41 @@
+using Npgsql;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace WinFormsApp2
+{
+    internal class DbConnection
+    {
+        static public string login = "";
+        static public string password = "";
+        
+        static public NpgsqlConnection conn;
+        static public NpgsqlCommand cmd;
+        static public NpgsqlDataAdapter dataAdapter;
+        static public bool Connect()
+        {
+            try
+            {
+                string connStr = $"host = 245e1-rw.db.pub.dbaas.postgrespro.ru; port = 5432; database = dbpractice;username ={login}; password = {password};";
+                conn = new NpgsqlConnection(connStr);
+                conn.Open();
+                cmd = new NpgsqlCommand();
+                cmd.Connection = conn;
+                dataAdapter = new NpgsqlDataAdapter(cmd);
+                return true;
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show("Ошибка" + ex);
+                return false;
+            }
+        }
+        static public void CloseConnection()
+        {
+            conn.Close();
+        }
+    }
+}

WinFormsApp2/WinFormsApp2/Form1.Designer.cs

@@ -0,0 +1,80 @@
+namespace WinFormsApp2
+{
+    partial class Form1
+    {
+        /// <summary>
+        ///  Required designer variable.
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary>
+        ///  Clean up any resources being used.
+        /// </summary>
+        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Windows Form Designer generated code
+
+        /// <summary>
+        ///  Required method for Designer support - do not modify
+        ///  the contents of this method with the code editor.
+        /// </summary>
+        private void InitializeComponent()
+        {
+            textBox1 = new TextBox();
+            textBox2 = new TextBox();
+            button1 = new Button();
+            SuspendLayout();
+            // 
+            // textBox1
+            // 
+            textBox1.Location = new Point(329, 140);
+            textBox1.Name = "textBox1";
+            textBox1.Size = new Size(159, 27);
+            textBox1.TabIndex = 0;
+            // 
+            // textBox2
+            // 
+            textBox2.Location = new Point(329, 184);
+            textBox2.Name = "textBox2";
+            textBox2.Size = new Size(159, 27);
+            textBox2.TabIndex = 1;
+            // 
+            // button1
+            // 
+            button1.Location = new Point(327, 232);
+            button1.Name = "button1";
+            button1.Size = new Size(161, 29);
+            button1.TabIndex = 2;
+            button1.Text = "Вход";
+            button1.UseVisualStyleBackColor = true;
+            button1.Click += button1_Click;
+            // 
+            // Form1
+            // 
+            AutoScaleDimensions = new SizeF(8F, 20F);
+            AutoScaleMode = AutoScaleMode.Font;
+            ClientSize = new Size(800, 450);
+            Controls.Add(button1);
+            Controls.Add(textBox2);
+            Controls.Add(textBox1);
+            Name = "Form1";
+            Text = "Form1";
+            ResumeLayout(false);
+            PerformLayout();
+        }
+
+        #endregion
+
+        private TextBox textBox1;
+        private TextBox textBox2;
+        private Button button1;
+    }
+}

WinFormsApp2/WinFormsApp2/Form1.cs

@@ -0,0 +1,30 @@
+namespace WinFormsApp2
+{
+    public partial class Form1 : Form
+    {
+        public Form1()
+        {
+            InitializeComponent();
+        }
+
+        private void button1_Click(object sender, EventArgs e)
+        {
+            if (textBox1.Text == "" || textBox2.Text == "")
+            {
+                MessageBox.Show("Ââåäèòå ëîãèí è ïàðîëü!");
+            }
+            else
+            {
+                DbConnection.login = textBox1.Text;
+                DbConnection.password = textBox2.Text;
+
+                if (DbConnection.Connect() == true)
+                {
+                    new MainForm().Show();
+                    this.Hide();
+                }
+                
+            }
+        }
+    }
+}

WinFormsApp2/WinFormsApp2/Form1.resx

@@ -0,0 +1,120 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!--
+    Microsoft ResX Schema
+
+    Version 2.0
+
+    The primary goals of this format is to allow a simple XML format
+    that is mostly human readable. The generation and parsing of the
+    various data types are done through the TypeConverter classes
+    associated with the data types.
+
+    Example:
+
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+
+    There are any number of "resheader" rows that contain simple
+    name/value pairs.
+
+    Each data row contains a name, and value. The row also contains a
+    type or mimetype. Type corresponds to a .NET class that support
+    text/value conversion through the TypeConverter architecture.
+    Classes that don't support this are serialized and stored with the
+    mimetype set.
+
+    The mimetype is used for serialized objects, and tells the
+    ResXResourceReader how to depersist the object. This is currently not
+    extensible. For a given mimetype the value must be set accordingly:
+
+    Note - application/x-microsoft.net.object.binary.base64 is the format
+    that the ResXResourceWriter will generate, however the reader can
+    read any of the formats listed below.
+
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>

WinFormsApp2/WinFormsApp2/MainForm.Designer.cs

@@ -0,0 +1,146 @@
+namespace WinFormsApp2
+{
+    partial class MainForm
+    {
+        /// <summary>
+        /// Required designer variable.
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary>
+        /// Clean up any resources being used.
+        /// </summary>
+        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Windows Form Designer generated code
+
+        /// <summary>
+        /// Required method for Designer support - do not modify
+        /// the contents of this method with the code editor.
+        /// </summary>
+        private void InitializeComponent()
+        {
+            dataGridView1 = new DataGridView();
+            textBox1 = new TextBox();
+            textBox2 = new TextBox();
+            label1 = new Label();
+            button1 = new Button();
+            button2 = new Button();
+            button3 = new Button();
+            button4 = new Button();
+            ((System.ComponentModel.ISupportInitialize)dataGridView1).BeginInit();
+            SuspendLayout();
+            // 
+            // dataGridView1
+            // 
+            dataGridView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.AutoSize;
+            dataGridView1.Location = new Point(25, 21);
+            dataGridView1.Name = "dataGridView1";
+            dataGridView1.RowHeadersWidth = 51;
+            dataGridView1.Size = new Size(422, 236);
+            dataGridView1.TabIndex = 2;
+            dataGridView1.CellContentClick += dataGridView1_CellContentClick;
+            // 
+            // textBox1
+            // 
+            textBox1.Location = new Point(26, 271);
+            textBox1.Name = "textBox1";
+            textBox1.Size = new Size(324, 27);
+            textBox1.TabIndex = 3;
+            // 
+            // textBox2
+            // 
+            textBox2.Location = new Point(453, 47);
+            textBox2.Name = "textBox2";
+            textBox2.Size = new Size(276, 27);
+            textBox2.TabIndex = 4;
+            // 
+            // label1
+            // 
+            label1.AutoSize = true;
+            label1.Location = new Point(461, 23);
+            label1.Name = "label1";
+            label1.Size = new Size(73, 20);
+            label1.TabIndex = 5;
+            label1.Text = "Фамилия";
+            // 
+            // button1
+            // 
+            button1.Location = new Point(26, 303);
+            button1.Name = "button1";
+            button1.Size = new Size(94, 29);
+            button1.TabIndex = 6;
+            button1.Text = "Поиск";
+            button1.UseVisualStyleBackColor = true;
+            button1.Click += button1_Click;
+            // 
+            // button2
+            // 
+            button2.Location = new Point(453, 80);
+            button2.Name = "button2";
+            button2.Size = new Size(94, 29);
+            button2.TabIndex = 7;
+            button2.Text = "Добавит";
+            button2.UseVisualStyleBackColor = true;
+            button2.Click += button2_Click;
+            // 
+            // button3
+            // 
+            button3.Location = new Point(553, 80);
+            button3.Name = "button3";
+            button3.Size = new Size(94, 29);
+            button3.TabIndex = 8;
+            button3.Text = "Изменить";
+            button3.UseVisualStyleBackColor = true;
+            button3.Click += button3_Click;
+            // 
+            // button4
+            // 
+            button4.Location = new Point(453, 228);
+            button4.Name = "button4";
+            button4.Size = new Size(94, 29);
+            button4.TabIndex = 9;
+            button4.Text = "Удалить";
+            button4.UseVisualStyleBackColor = true;
+            button4.Click += button4_Click;
+            // 
+            // MainForm
+            // 
+            AutoScaleDimensions = new SizeF(8F, 20F);
+            AutoScaleMode = AutoScaleMode.Font;
+            ClientSize = new Size(800, 450);
+            Controls.Add(button4);
+            Controls.Add(button3);
+            Controls.Add(button2);
+            Controls.Add(button1);
+            Controls.Add(label1);
+            Controls.Add(textBox2);
+            Controls.Add(textBox1);
+            Controls.Add(dataGridView1);
+            Name = "MainForm";
+            Text = "MainForm";
+            ((System.ComponentModel.ISupportInitialize)dataGridView1).EndInit();
+            ResumeLayout(false);
+            PerformLayout();
+        }
+
+        #endregion
+
+        private DataGridView dataGridView1;
+        private TextBox textBox1;
+        private TextBox textBox2;
+        private Label label1;
+        private Button button1;
+        private Button button2;
+        private Button button3;
+        private Button button4;
+    }
+}

WinFormsApp2/WinFormsApp2/MainForm.cs

@@ -0,0 +1,59 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace WinFormsApp2
+{
+    public partial class MainForm : Form
+    {
+        public MainForm()
+        {
+            InitializeComponent();
+
+            Table.LoadTable();
+            dataGridView1.DataSource = Table.dt;
+        }
+        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
+        {
+
+        }
+
+        private void button2_Click(object sender, EventArgs e)
+        {
+            if(textBox2.Text == "")
+            {
+                MessageBox.Show("Заполните поля");
+            }
+            else
+            {
+               Table.Add(textBox2.Text);
+            }
+            Table.LoadTable();
+
+        }
+
+        private void button3_Click(object sender, EventArgs e)
+        {
+            int id = Convert.ToInt32(dataGridView1.CurrentRow.Cells["id"].Value);
+            Table.Update(id, textBox2.Text);
+            Table.LoadTable();
+        }
+
+        private void button4_Click(object sender, EventArgs e)
+        {
+
+        }
+
+        private void button1_Click(object sender, EventArgs e)
+        {
+            Table.Search(textBox1.Text);
+            
+        }
+    }
+}

WinFormsApp2/WinFormsApp2/MainForm.resx

@@ -0,0 +1,120 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!--
+    Microsoft ResX Schema
+
+    Version 2.0
+
+    The primary goals of this format is to allow a simple XML format
+    that is mostly human readable. The generation and parsing of the
+    various data types are done through the TypeConverter classes
+    associated with the data types.
+
+    Example:
+
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+
+    There are any number of "resheader" rows that contain simple
+    name/value pairs.
+
+    Each data row contains a name, and value. The row also contains a
+    type or mimetype. Type corresponds to a .NET class that support
+    text/value conversion through the TypeConverter architecture.
+    Classes that don't support this are serialized and stored with the
+    mimetype set.
+
+    The mimetype is used for serialized objects, and tells the
+    ResXResourceReader how to depersist the object. This is currently not
+    extensible. For a given mimetype the value must be set accordingly:
+
+    Note - application/x-microsoft.net.object.binary.base64 is the format
+    that the ResXResourceWriter will generate, however the reader can
+    read any of the formats listed below.
+
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>

WinFormsApp2/WinFormsApp2/Program.cs

@@ -0,0 +1,17 @@
+namespace WinFormsApp2
+{
+    internal static class Program
+    {
+        /// <summary>
+        ///  The main entry point for the application.
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+            // To customize application configuration such as set high DPI settings or default font,
+            // see https://aka.ms/applicationconfiguration.
+            ApplicationConfiguration.Initialize();
+            Application.Run(new Form1());
+        }
+    }
+}

WinFormsApp2/WinFormsApp2/Table.cs

@@ -0,0 +1,93 @@
+using Npgsql;
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace WinFormsApp2
+{
+    
+    internal class Table
+    {
+        static public DataTable dt = new DataTable();
+
+        static public void LoadTable()
+        {
+            try
+            {
+                dt.Clear();
+                DbConnection.cmd.CommandText = @"select * from employees";
+                DbConnection.dataAdapter.SelectCommand = DbConnection.cmd;
+                DbConnection.dataAdapter.Fill(dt);
+            }
+            catch(Exception ex) 
+            {
+                MessageBox.Show("Error: ", ex.Message);
+            }
+        }
+        static public void Add(string data)
+        {
+            try
+            {
+                dt.Clear();
+                DbConnection.cmd.CommandText = @"insert into employees (last_name) values (@d)";
+                DbConnection.cmd.Parameters.Clear();
+                DbConnection.cmd.Parameters.AddWithValue("@d", data);
+                DbConnection.cmd.ExecuteNonQuery();
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show("ERROR: ", ex.Message);
+            }
+        }
+        static public void Delete(int id)
+        {
+            try
+            {
+                dt.Clear();
+                DbConnection.cmd.CommandText = @"delete from employees where id = @i";
+                DbConnection.cmd.Parameters.Clear();
+                DbConnection.cmd.ExecuteNonQuery();
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show("ERROR: ", ex.Message);
+            }
+        }
+        static public void Update(int id, string data)
+        {
+            try
+            {
+                dt.Clear();
+                DbConnection.cmd.CommandText = @"update employees set last_name = @d where id = @i";
+                DbConnection.cmd.Parameters.Clear();
+                DbConnection.cmd.Parameters.AddWithValue("@i", id);
+                DbConnection.cmd.Parameters.AddWithValue("@d", data);
+                DbConnection.cmd.ExecuteNonQuery();
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show("ERROR: ", ex.Message);
+            }
+        }
+        static public void Search(string data)
+        {
+            try
+            {
+                dt.Clear();
+                DbConnection.cmd.CommandText = @"select * from employees where last_name like '%' || @d || '%'";
+                DbConnection.cmd.Parameters.Clear();
+                DbConnection.cmd.Parameters.AddWithValue("@d", data);
+                DbConnection.dataAdapter.SelectCommand = DbConnection.cmd;
+                DbConnection.dataAdapter.Fill(dt);
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show("ERROR: ", ex.Message);
+            }
+        }
+
+    }
+}

WinFormsApp2/WinFormsApp2/WinFormsApp2.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWindowsForms>true</UseWindowsForms>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Npgsql" Version="10.0.3" />
+  </ItemGroup>
+
+</Project>

WinFormsApp2/WinFormsApp2/WinFormsApp2.csproj.user

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Compile Update="Form1.cs">
+      <SubType>Form</SubType>
+    </Compile>
+    <Compile Update="MainForm.cs">
+      <SubType>Form</SubType>
+    </Compile>
+  </ItemGroup>
+</Project>

WinFormsApp2/WinFormsApp2/bin/Debug/net8.0-windows/WinFormsApp2.deps.json

@@ -0,0 +1,93 @@
+{
+  "runtimeTarget": {
+    "name": ".NETCoreApp,Version=v8.0",
+    "signature": ""
+  },
+  "compilationOptions": {},
+  "targets": {
+    ".NETCoreApp,Version=v8.0": {
+      "WinFormsApp2/1.0.0": {
+        "dependencies": {
+          "Npgsql": "10.0.3"
+        },
+        "runtime": {
+          "WinFormsApp2.dll": {}
+        }
+      },
+      "Microsoft.Extensions.DependencyInjection.Abstractions/8.0.0": {
+        "runtime": {
+          "lib/net8.0/Microsoft.Extensions.DependencyInjection.Abstractions.dll": {
+            "assemblyVersion": "8.0.0.0",
+            "fileVersion": "8.0.23.53103"
+          }
+        }
+      },
+      "Microsoft.Extensions.Logging.Abstractions/8.0.0": {
+        "dependencies": {
+          "Microsoft.Extensions.DependencyInjection.Abstractions": "8.0.0"
+        },
+        "runtime": {
+          "lib/net8.0/Microsoft.Extensions.Logging.Abstractions.dll": {
+            "assemblyVersion": "8.0.0.0",
+            "fileVersion": "8.0.23.53103"
+          }
+        }
+      },
+      "Npgsql/10.0.3": {
+        "dependencies": {
+          "Microsoft.Extensions.Logging.Abstractions": "8.0.0",
+          "System.Diagnostics.DiagnosticSource": "9.0.11"
+        },
+        "runtime": {
+          "lib/net8.0/Npgsql.dll": {
+            "assemblyVersion": "10.0.3.0",
+            "fileVersion": "10.0.3.0"
+          }
+        }
+      },
+      "System.Diagnostics.DiagnosticSource/9.0.11": {
+        "runtime": {
+          "lib/net8.0/System.Diagnostics.DiagnosticSource.dll": {
+            "assemblyVersion": "9.0.0.0",
+            "fileVersion": "9.0.1125.51716"
+          }
+        }
+      }
+    }
+  },
+  "libraries": {
+    "WinFormsApp2/1.0.0": {
+      "type": "project",
+      "serviceable": false,
+      "sha512": ""
+    },
+    "Microsoft.Extensions.DependencyInjection.Abstractions/8.0.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-cjWrLkJXK0rs4zofsK4bSdg+jhDLTaxrkXu4gS6Y7MAlCvRyNNgwY/lJi5RDlQOnSZweHqoyvgvbdvQsRIW+hg==",
+      "path": "microsoft.extensions.dependencyinjection.abstractions/8.0.0",
+      "hashPath": "microsoft.extensions.dependencyinjection.abstractions.8.0.0.nupkg.sha512"
+    },
+    "Microsoft.Extensions.Logging.Abstractions/8.0.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-arDBqTgFCyS0EvRV7O3MZturChstm50OJ0y9bDJvAcmEPJm0FFpFyjU/JLYyStNGGey081DvnQYlncNX5SJJGA==",
+      "path": "microsoft.extensions.logging.abstractions/8.0.0",
+      "hashPath": "microsoft.extensions.logging.abstractions.8.0.0.nupkg.sha512"
+    },
+    "Npgsql/10.0.3": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-7nb5YzXuvWWJxB0J8DiyL3we+X4FOctZrt0fIBnucOIaIevFEEwGQVZKtiu9olXdlNAK1eNgqSral6r/jlhI4w==",
+      "path": "npgsql/10.0.3",
+      "hashPath": "npgsql.10.0.3.nupkg.sha512"
+    },
+    "System.Diagnostics.DiagnosticSource/9.0.11": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-/QzMFklOm8Ak//YB0I2kR+ByxUndT63ucrRWQm0xZsuLExJWrVDeGKtYZDuBackd9dThbwMdOotIEc4c4KwJiw==",
+      "path": "system.diagnostics.diagnosticsource/9.0.11",
+      "hashPath": "system.diagnostics.diagnosticsource.9.0.11.nupkg.sha512"
+    }
+  }
+}

WinFormsApp2/WinFormsApp2/bin/Debug/net8.0-windows/WinFormsApp2.runtimeconfig.json

@@ -0,0 +1,19 @@
+{
+  "runtimeOptions": {
+    "tfm": "net8.0",
+    "frameworks": [
+      {
+        "name": "Microsoft.NETCore.App",
+        "version": "8.0.0"
+      },
+      {
+        "name": "Microsoft.WindowsDesktop.App",
+        "version": "8.0.0"
+      }
+    ],
+    "configProperties": {
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": true,
+      "CSWINRT_USE_WINDOWS_UI_XAML_PROJECTIONS": false
+    }
+  }
+}

WinFormsApp2/WinFormsApp2/obj/Debug/net8.0-windows/.NETCoreApp,Version=v8.0.AssemblyAttributes.cs

@@ -0,0 +1,4 @@
+// <autogenerated />
+using System;
+using System.Reflection;
+[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETCoreApp,Version=v8.0", FrameworkDisplayName = ".NET 8.0")]

WinFormsApp2/WinFormsApp2/obj/Debug/net8.0-windows/WinFormsApp2.AssemblyInfo.cs

@@ -0,0 +1,25 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     Этот код создан программой.
+//     Исполняемая версия:4.0.30319.42000
+//
+//     Изменения в этом файле могут привести к неправильной работе и будут потеряны в случае
+//     повторной генерации кода.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
+[assembly: System.Reflection.AssemblyCompanyAttribute("WinFormsApp2")]
+[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
+[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+468df59c8fe4408fc9de3cfcb3ad5dad4c289930")]
+[assembly: System.Reflection.AssemblyProductAttribute("WinFormsApp2")]
+[assembly: System.Reflection.AssemblyTitleAttribute("WinFormsApp2")]
+[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
+[assembly: System.Runtime.Versioning.TargetPlatformAttribute("Windows7.0")]
+[assembly: System.Runtime.Versioning.SupportedOSPlatformAttribute("Windows7.0")]
+
+// Создано классом WriteCodeFragment MSBuild.
+

WinFormsApp2/WinFormsApp2/obj/Debug/net8.0-windows/WinFormsApp2.AssemblyInfoInputs.cache

@@ -0,0 +1 @@
+eef6909f4b9addbfee97a64119cecb32f1259a2dfe8cffbb51eb4af64b84de87

WinFormsApp2/WinFormsApp2/obj/Debug/net8.0-windows/WinFormsApp2.GeneratedMSBuildEditorConfig.editorconfig

@@ -0,0 +1,22 @@
+is_global = true
+build_property.ApplicationManifest = 
+build_property.StartupObject = 
+build_property.ApplicationDefaultFont = 
+build_property.ApplicationHighDpiMode = 
+build_property.ApplicationUseCompatibleTextRendering = 
+build_property.ApplicationVisualStyles = 
+build_property.TargetFramework = net8.0-windows
+build_property.TargetPlatformMinVersion = 7.0
+build_property.UsingMicrosoftNETSdkWeb = 
+build_property.ProjectTypeGuids = 
+build_property.InvariantGlobalization = 
+build_property.PlatformNeutralAssembly = 
+build_property.EnforceExtendedAnalyzerRules = 
+build_property._SupportedPlatformList = Linux,macOS,Windows
+build_property.RootNamespace = WinFormsApp2
+build_property.ProjectDir = C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\
+build_property.EnableComHosting = 
+build_property.EnableGeneratedComInterfaceComImportInterop = 
+build_property.CsWinRTUseWindowsUIXamlProjections = false
+build_property.EffectiveAnalysisLevelStyle = 8.0
+build_property.EnableCodeStyleSeverity = 

WinFormsApp2/WinFormsApp2/obj/Debug/net8.0-windows/WinFormsApp2.GlobalUsings.g.cs

@@ -0,0 +1,10 @@
+// <auto-generated/>
+global using global::System;
+global using global::System.Collections.Generic;
+global using global::System.Drawing;
+global using global::System.IO;
+global using global::System.Linq;
+global using global::System.Net.Http;
+global using global::System.Threading;
+global using global::System.Threading.Tasks;
+global using global::System.Windows.Forms;

WinFormsApp2/WinFormsApp2/obj/Debug/net8.0-windows/WinFormsApp2.csproj.CoreCompileInputs.cache

@@ -0,0 +1 @@
+43592f717399150508347ddde03c6dbcb195da70d510dd3d724f659f6463205d

WinFormsApp2/WinFormsApp2/obj/Debug/net8.0-windows/WinFormsApp2.csproj.FileListAbsolute.txt

@@ -0,0 +1,24 @@
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\bin\Debug\net8.0-windows\WinFormsApp2.exe
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\bin\Debug\net8.0-windows\WinFormsApp2.dll
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\bin\Debug\net8.0-windows\Microsoft.Extensions.Logging.Abstractions.dll
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\bin\Debug\net8.0-windows\Npgsql.dll
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\bin\Debug\net8.0-windows\System.Diagnostics.DiagnosticSource.dll
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\bin\Debug\net8.0-windows\Microsoft.Extensions.DependencyInjection.Abstractions.dll
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\WinFormsApp2.csproj.AssemblyReference.cache
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\WinFormsApp2.Form1.resources
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\WinFormsApp2.MainForm.resources
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\WinFormsApp2.csproj.GenerateResource.cache
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\WinFormsApp2.GeneratedMSBuildEditorConfig.editorconfig
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\WinFormsApp2.AssemblyInfoInputs.cache
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\WinFormsApp2.AssemblyInfo.cs
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\WinFormsApp2.csproj.CoreCompileInputs.cache
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\WinFormsApp2.sourcelink.json
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\WinForms.CF340A35.Up2Date
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\WinFormsApp2.dll
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\refint\WinFormsApp2.dll
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\WinFormsApp2.pdb
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\bin\Debug\net8.0-windows\WinFormsApp2.deps.json
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\bin\Debug\net8.0-windows\WinFormsApp2.runtimeconfig.json
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\bin\Debug\net8.0-windows\WinFormsApp2.pdb
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\WinFormsApp2.genruntimeconfig.cache
+C:\Users\vlade\Desktop\практика\WinFormsApp2\WinFormsApp2\obj\Debug\net8.0-windows\ref\WinFormsApp2.dll

WinFormsApp2/WinFormsApp2/obj/Debug/net8.0-windows/WinFormsApp2.designer.deps.json

@@ -0,0 +1,80 @@
+{
+  "runtimeTarget": {
+    "name": ".NETCoreApp,Version=v8.0",
+    "signature": ""
+  },
+  "compilationOptions": {},
+  "targets": {
+    ".NETCoreApp,Version=v8.0": {
+      "Microsoft.Extensions.DependencyInjection.Abstractions/8.0.0": {
+        "runtime": {
+          "lib/net8.0/Microsoft.Extensions.DependencyInjection.Abstractions.dll": {
+            "assemblyVersion": "8.0.0.0",
+            "fileVersion": "8.0.23.53103"
+          }
+        }
+      },
+      "Microsoft.Extensions.Logging.Abstractions/8.0.0": {
+        "dependencies": {
+          "Microsoft.Extensions.DependencyInjection.Abstractions": "8.0.0"
+        },
+        "runtime": {
+          "lib/net8.0/Microsoft.Extensions.Logging.Abstractions.dll": {
+            "assemblyVersion": "8.0.0.0",
+            "fileVersion": "8.0.23.53103"
+          }
+        }
+      },
+      "Npgsql/10.0.3": {
+        "dependencies": {
+          "Microsoft.Extensions.Logging.Abstractions": "8.0.0",
+          "System.Diagnostics.DiagnosticSource": "9.0.11"
+        },
+        "runtime": {
+          "lib/net8.0/Npgsql.dll": {
+            "assemblyVersion": "10.0.3.0",
+            "fileVersion": "10.0.3.0"
+          }
+        }
+      },
+      "System.Diagnostics.DiagnosticSource/9.0.11": {
+        "runtime": {
+          "lib/net8.0/System.Diagnostics.DiagnosticSource.dll": {
+            "assemblyVersion": "9.0.0.0",
+            "fileVersion": "9.0.1125.51716"
+          }
+        }
+      }
+    }
+  },
+  "libraries": {
+    "Microsoft.Extensions.DependencyInjection.Abstractions/8.0.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-cjWrLkJXK0rs4zofsK4bSdg+jhDLTaxrkXu4gS6Y7MAlCvRyNNgwY/lJi5RDlQOnSZweHqoyvgvbdvQsRIW+hg==",
+      "path": "microsoft.extensions.dependencyinjection.abstractions/8.0.0",
+      "hashPath": "microsoft.extensions.dependencyinjection.abstractions.8.0.0.nupkg.sha512"
+    },
+    "Microsoft.Extensions.Logging.Abstractions/8.0.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-arDBqTgFCyS0EvRV7O3MZturChstm50OJ0y9bDJvAcmEPJm0FFpFyjU/JLYyStNGGey081DvnQYlncNX5SJJGA==",
+      "path": "microsoft.extensions.logging.abstractions/8.0.0",
+      "hashPath": "microsoft.extensions.logging.abstractions.8.0.0.nupkg.sha512"
+    },
+    "Npgsql/10.0.3": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-7nb5YzXuvWWJxB0J8DiyL3we+X4FOctZrt0fIBnucOIaIevFEEwGQVZKtiu9olXdlNAK1eNgqSral6r/jlhI4w==",
+      "path": "npgsql/10.0.3",
+      "hashPath": "npgsql.10.0.3.nupkg.sha512"
+    },
+    "System.Diagnostics.DiagnosticSource/9.0.11": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-/QzMFklOm8Ak//YB0I2kR+ByxUndT63ucrRWQm0xZsuLExJWrVDeGKtYZDuBackd9dThbwMdOotIEc4c4KwJiw==",
+      "path": "system.diagnostics.diagnosticsource/9.0.11",
+      "hashPath": "system.diagnostics.diagnosticsource.9.0.11.nupkg.sha512"
+    }
+  }
+}

WinFormsApp2/WinFormsApp2/obj/Debug/net8.0-windows/WinFormsApp2.designer.runtimeconfig.json

@@ -0,0 +1,24 @@
+{
+  "runtimeOptions": {
+    "tfm": "net8.0",
+    "frameworks": [
+      {
+        "name": "Microsoft.NETCore.App",
+        "version": "8.0.0"
+      },
+      {
+        "name": "Microsoft.WindowsDesktop.App",
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