How can I allow ctrl+a with TextBox in winform?

Question

I\'m asking the question already asked (and even answered) here: Why are some textboxes not accepting Control + A shortcut to select all by default

But that answer d

Answer 1

Like other answers indicate, Application.EnableVisualStyles() should be called. Also the TextBox.ShortcutsEnabled should be set to true. But if your TextBox.Multiline is enabled then Ctrl+A will not work (see MSDN documentation). Using RichTextBox instead will get around the problem.

Answer 2

Quick answer is that if you are using multiline true you have to explicitly call the select all.

private void tbUsername_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.A && e.Control)
    {
        tbUsername.SelectAll();
    }
}

Answer 3

Textbox has a method SelectAll() and worked well for me. (.net 4.5)