TextBox MyTextBox = new TextBox();
Button MyButton = new Bitton();

Panel.Controls.Add(MyTextBox);
Panel.Controls.Add(MyButton);

public partial class _Default : System.Web.UI.Page 
{
    Label label1 = new Label ( );
    AdvanceButton button1 = new AdvanceButton ( );
    public int test = 1;

    public void TestFunction(Object sender,
    EventArgs e)
    {
        AdvanceButton ab1 = new AdvanceButton();
        ab1 = (AdvanceButton)sender;

        label1.Text = ab1.LabelName;
    }

    protected void Page_Load(object sender, EventArgs e)
    {

        button1.Text = "Button1";
        label1.Text = "before push butyton text";

        Panel1.Controls.Add ( label1 );
        Panel1.Controls.Add ( button1 );

        button1.Click += new EventHandler ( TestFunction );
    }
    protected void Button1_Click ( object sender, EventArgs e )
    {

        


    }
}

public class AdvanceButton:Button
{
	public AdvanceButton()
	{
		
	}

    public String LabelName = "label name ahaha";
}