Programalama > C#

		private void tb3_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
		{
			if ((int)e.KeyChar >= 47 && (int)e.KeyChar <= 58)
			{
				e.Handled = false;//Basilan tusu yaz
			}
			else if ((int)e.KeyChar == 8)
			{
				e.Handled = false;//Basilan tusu yaz
			}
			else
			{
				e.Handled = true;//Basilan tusu yoksay ve yazma
			}
		}