Detecting ctrl+left click on winforms application

Question

How do I detect when the users holds ctrl and left clicks on a button in a windows forms application?

Answer 1

You need to check the value of Form.ModifierKeys to see if Control was pressed, e.g.:

    btn.Click += new EventHandler(btn_Click);

    private void btn_Click(object sender, EventArgs e)
    {
        if (Form.ModifierKeys == Keys.Control)
        {
            // Do Ctrl-Left Click Work
        }
    }