private void txtUserName1_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar >= (char)Keys.D0 && e.KeyChar <= (char)Keys.D9 || e.KeyChar == (char)Keys.Back)
{
e.Handled = false;
}
else
{
e.Handled = true;
}
ComForm.IsAlphAndNum(e);
}