C#文本框只能输入数字和退格

/**////C#文本框只能输入数字和退?




private void TextBox_KeyPress(object sender, KeyPressEventArgs e)




...{


if(e.KeyChar!=8&&!Char.IsDigit(e.KeyChar))




...{


e.Handled = true;


}


}






/**////或?




private void TextBox_KeyPress(object sender, KeyPressEventArgs e)




...{


if(e.KeyChar!=''&&!Char.IsDigit(e.KeyChar))




...{


e.Handled = true;


}


}