Question

probably a simple one, have a dozen textboxes that each contain one character. i’m try to process the delete key to clear the current text in the current textbox, then i want it to decrement the tab index by go and go back to edit the previous textbox. i don’t know how to reference the current textbox’s tab index and go back one. to go to the next one i’m merely performing a send key for ‘TAB’.

in my keyprocess function i have:

//DEL goes back one text box and clears it
            if (keyData == (Keys.Delete))
            {
                //Clear textbox
                //Go back one textbox to edit
                return true;
            }

again once i finished editing a text box i am sending:

 SendKeys.Send("{TAB}");

maybe there is a better way to do this.

Answer 1

You can find the previous TextBox with the GetNextControl method:

if (e.KeyCode == Keys.Delete)
{
    var textBox = ((TextBox) sender);
    textBox.Text = string.Empty;

    var previous = textBox.Parent.GetNextControl(textBox, false);
    if (previous != null)
        previous.Focus();

    e.Handled = true;
}

Or as @Mr Lister suggested you can send the SHIFT+TAB key combination with:
SendKeys.Send("+{TAB}"); but it’s a little hacky solution.