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Possible Duplicate:
Restrict numbers and letters in textbox – C#
I have a textbox called TextBox1. The user should only be allowed to enter capital letters. Other characters have to be denied. How can I do that?
private void TextBox1_KeyDown(object sender, KeyEventArgs e)
{
if (!"ABCDEFGHIJKLMNOPQRSTUVWXYZ".Contains(Convert.ToChar(e.KeyValue)))
{
SendKeys.Send(Convert.ToChar(0).ToString());
}
}
Use MaskedTextbox instead. Much easier. Your mask can be something like this:
>???????????depending on the maximal allowed length.