Disallow entry from numeric keyboard to custom date textbox and pass entry to textbox

[EgoSum]

Can someone help me with custom text box?

I want change behavior custom date text box - disallow entry and pass entry from numeric keyboard to a text box. Code below disallow entry, but how I can pass entry?

public class myDateTextBox : AMS.TextBox.DateTextBox
{[INDENT]protected override bool ProcessDialogKey(Keys keyData)
{[INDENT]if (keyData >= Keys.NumPad0 && keyData <= Keys.NumPad9)
{[INDENT]base.ProcessDialogKey(keyData);
return true;[/INDENT]
}[/INDENT]
return base.ProcessDialogKey(keyData);
}[/INDENT]
}

I try something like this, but it dosen't work.

public class x
{ // ...[INDENT]private void textBox_KeyDown(object sender, KeyEventArgs e)
{[INDENT]if (e.KeyCode >= Keys.NumPad0 && e.KeyCode <= Keys.NumPad9)
{[INDENT]textBox.Text = Convert.ToString(e.KeyData);[/INDENT]
}[/INDENT]
}[/INDENT]
}

Thanks in advance for any help.