C# WinForms - How to Select All Text in a Multiline Textbox

You can either override KeyUp or KeyDown for your TextBox. Simply use the following code...

Code Snippet

1. private void TextBox_KeyUp(object sender, KeyEventArgs e)
2. {
3.     if (e.KeyData == (Keys.Control | Keys.A))
4.         TextBox.SelectAll();
5. }

End of Code Snippet