How to disable a textbox keyboard shorcuts in c#?

Question

I've just noticed that Textbox have a default shortcut so that whenever you press Ctrl + H, it starts with deleting letters as if you pressed BackSpace.

This can get quite annoying since I want to open a Form whenever Ctrl + H is pressed. Is there any way to stop the backspacing while still being able to use it to open the Windows Form?

Answer 1

CTRL-H is the ASCII BS (Backspace) character.

You can disable (or redefine) it, since CTRL+H and BackSpace are not exactly the same thing. There are a few examples listed on this question with other keys.

You need to add the KeyEventHandler in your Form1.Designer.cs like this:

this.textBox1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.textBox1_KeyDown);

And in your Form1.cs add this function:

private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.H && e.Modifiers == Keys.Control)
    {
        //uncomment if ReadOnly is not working
        //e.SuppressKeyPress  = true;
        
        textbox1.ReadOnly = true;
        Form2 form2 = new Form2();
        form2.Show();
        textbox1.ReadOnly = false;
    }
}