Test first component.

VisualComponentsForm/VisualComponentsForm/FormMain.Designer.cs

@@ -1,6 +1,6 @@
 namespace VisualComponentsForm
 {
-    partial class Form1
+    partial class FormMain
     {
         /// <summary>
         ///  Required designer variable.
@@ -28,10 +28,10 @@
         /// </summary>
         private void InitializeComponent()
         {
-            this.components = new System.ComponentModel.Container();
-            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
-            this.ClientSize = new System.Drawing.Size(800, 450);
-            this.Text = "Form1";
+            components = new System.ComponentModel.Container();
+            AutoScaleMode = AutoScaleMode.Font;
+            ClientSize = new Size(800, 450);
+            Text = "Form1";
         }
 
         #endregion

VisualComponentsForm/VisualComponentsForm/FormMain.cs

@@ -1,8 +1,8 @@
 namespace VisualComponentsForm
 {
-    public partial class Form1 : Form
+    public partial class FormMain : Form
     {
-        public Form1()
+        public FormMain()
         {
             InitializeComponent();
         }

VisualComponentsForm/VisualComponentsForm/FormMain.resx

@@ -1,24 +1,24 @@
 <?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 
+
+    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="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>
@@ -26,36 +26,36 @@
         <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 
+
+    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 
+
+    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 
+
+    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 
+
+    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 
+    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 
+    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 
+    value   : The object must be serialized into a byte array
             : using a System.ComponentModel.TypeConverter
             : and then encoded with base64 encoding.
     -->

VisualComponentsForm/VisualComponentsForm/Program.cs

@@ -11,7 +11,7 @@ namespace VisualComponentsForm
             // To customize application configuration such as set high DPI settings or default font,
             // see https://aka.ms/applicationconfiguration.
             ApplicationConfiguration.Initialize();
-            Application.Run(new Form1());
+            Application.Run(new FormMain());
         }
     }
 }

VisualComponentsLib/CustomListBox/MyListBox.cs

@@ -8,6 +8,40 @@ namespace VisualComponentsLib.CustomListBox
 {
     public class MyListBox : ListBox
     {
+        //получение выбранного значения
+        string _chooiceElem { get; set; } = string.Empty;
 
+        //делегат на смену значения
+        public delegate void GetNewVal(string data, EventArgs e);
+
+        //событие
+        public event GetNewVal ChangeSelectedVal;
+
+        //base constructor; привязываем событие к делегату
+        public MyListBox() : base() 
+        {
+            ChangeSelectedVal += _changeSelectedVal;
+        }
+
+        public void _addNewElem(string data)
+        {
+            Items.Add(data);
+        }
+
+        public void _clearListBox()
+        {
+            Items.Clear();
+        }
+
+        public void _clickToList(string data, EventArgs e)
+        {
+            ChangeSelectedVal(data, e);
+        }
+
+        //перезапись поля при событии смены значения
+        public void _changeSelectedVal(string data, EventArgs e)
+        {
+            _chooiceElem = data;
+        }
     }
 }