Question

My user can enter some text into the combobox but I wish that this text is automatically shown in capital letters (as if user had capslock on). Any ideas how to do this?

Answer 1

You will want to handle the KeyPress event.

private void ComboBox_KeyPress(object sender, KeyPressEventArgs e)
{
    if (e.KeyChar >= 'a' && e.KeyChar <= 'z')
        e.KeyChar -= (char)32;
}

32 is just the difference in ASCII values between lowercase and uppercase letters.