Restrict to only English chars

Question

I have a Winform with some edit boxes.

The form can be loaded in other languages too, like chinese! the requirement is that certain textboxes should accept only English chars for Example When user types in Tex box 1, it should be in english Whereas in if he types in Text box 2 and 3 it should be in Chinese ?

Is it possible to do something like this !

Answer 1

Yes, it's certainly possible. You can add a validation event handler that checks the character. You could have a dictionary of permissible characters, or if you restrict the character to a certain encoding (perhaps UTF-8), you could compare the character to a range of characters using < and >.

To be more specific: You can handle the KeyPress event. If e.KeyChar is invalid, set e.Handled to true.

Try this:

private void textBox_KeyPress(object sender, KeyPressEventArgs e)
{
    if (System.Text.Encoding.UTF8.GetByteCount(new char[] { e.KeyChar }) > 1)
    {
        e.Handled = true;
    }
}