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.NET/C#/WinForms: small code snippet to enable Ctrl-A for select all in a single/multi-line TextBox

Posted by jpluimers on 2012/12/04

WinForms does not automatically enable Ctrl-A as “Select All” action.

The below code snippet works when you bind it to the KeyDown event of a TextBox (actually the event is on Control).

The e.SuppressKeyPress = true suppresses the bell sound in a multiline TextBox, as e.Handled = true won’t.

        private void textBox_KeyDown_HandleCtrlAToSelectAllText(object sender, KeyEventArgs e)
        {
            TextBox textBox = sender as TextBox;
            if (null != textBox)
            {
                if (e.Control && e.KeyCode == Keys.A)
                {
                    textBox.SelectAll();
                    e.SuppressKeyPress = true;
                }
            }
        }

–jeroen

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