How to distinguish in a C# event if a change was made from code or by the user?

Question

I have a simple TextBox that is empty in the beginning. I have a simple event, _TextChanged, to know when the user changed anything in that TextBox. However, the event fires if I do anything with it myself from within code. Like setting textbox.Text = "Test"; or similar.

    private void textNazwa_TextChanged(object sender, EventArgs e) {         changesToClient = true;     } 

How do I make the event only fire on user interaction and not code changes?

Answer 1

I've been using this process, and it seems to work well. If the event fires and the focus is not in the textbox, then I ignore the request, so when I set the text the focus is elsewhere, but when the user is typing in the textbox, it has the focus, so I acknowledge the changes.

private void textNazwa_TextCanged(object sender, EventArgs e) {     if ( !textNazwa.Focused)          return;  }