Question

Assuming there are buttons with all the letters from the alphabet set as Text.
I want to call a function in these buttons and use this letter as argument.
Can I use the same piece of code for each button in some way?

something like

functionname(this.Text);

Problem is, that “this” referrs to the Form and not to the specific button.

Answer 1

In most event mechanisms you can obtain the source of the event; in classic win forms vents this is typically called “sender”. You can cast the sender to what you know it is, or some common base-type. For example:

void SomeEventHandler(object sender, SomeEventArgs e) {
    string text = ((Control)sender).Text;
    // ...
}

Hence with this a single event-handler can handle all the buttons.

This may vary subtly between infrastructure / tools (WCF, XNA etc) but fundamentally should remain similar.