Disallow paste in Textbox

Why would you want to prevent paste, but allow typing?
If an App did that to me, then I would probably be quite annoyed.

If you really must, then derive a class from textbox, and override WndProc. You can then filter the WM_PASTE message, and disregard it. That should do it.

public class myTextBox : TextBox
    {
    private const int WM_PASTE = 0x302;
    protected override void WndProc(ref Message m)
        {
        if (m.Msg != WM_PASTE)
            {
            base.WndProc(ref m);
            }
        }
    }

I still think it's a bad idea though...

Another method you may want to check is to set the property ShortcutsEnabled to false. Although that will disable both pasting and copying, and presumably any other short-cuts you can think of.

Otherwise as OriginalGriff said, I'd check for the WM_PASTE message. It's a lot more robust than checking the key presses and disabling the context menu.