C# WinApp อยากทราบขั้นตอนการทำงานของ control ครับ

public class txt : System.Windows.Forms.TextBox
	{
         public txt()
		{
                  // ใส่คำสั่งตรงนี้
                }
        }

public class TorTextbox : TextBox
    {
        public TorTextbox()
        {
 
        }
        [DefaultValue("")]
        public string testvalue { get; set; }
    }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Windows.Forms.Design;

namespace UserControl_2
{

    //Declare a class that inherits from ToolStripControlHost.
    [ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability.ToolStrip | ToolStripItemDesignerAvailability.StatusStrip)]
    public class ToolStripTextBox : ToolStripTextBoxControl
    {
        public ToolStripTextBox() : base(CreateControlInstance()) { }

        public TextBox dateTimePicker
        {
            get
            {
                return Control as TextBox;
            }
        }

        private static Control CreateControlInstance()
        {
            TextBox mtb = new TextBox();
           // mtb.Format = DateTimePickerFormat.Short;
            mtb.MinimumSize = new System.Drawing.Size(100, 16);
            return mtb;
        }
    }

    public class ToolStripTextBoxControl : ToolStripControlHost
    {
        public ToolStripTextBoxControl()
            : base(new Control())
        {
        }
        public ToolStripTextBoxControl(Control c)
            : base(c)
        {
        }
    }


     

}