Question

I need to call tabControl1_SelectedIndexChanged from Form1 in Form2

I have no idea how do this.

Answer 1

In general, you don’t call events from other classes. The idea is that events expose subscribe/unsubscribe behaviour. The implementation can choose to also expose a method which raises the event, but it doesn’t have to – and if the control you’re using doesn’t expose such a method for the SelectedIndexChanged event, you can’t force it to.

It’s not clear what you’re trying to achieve, but you may be able to programmatically select the appropriate tab instead – I’d expect that to raise the appropriate event. Rather than expose the tab control directly from Form1 to Form2 (which I hope are only placeholder names – give your forms meaningful names 🙂 it would be cleaner to expose a method in Form1 to perform the selection of the appropriate tab. That’s a more meaningful operation to perform on Form1 – it doesn’t rely as heavily on the implementation details. On the other hand, you may be able to create an even cleaner design using MVP patterns (or whatever suits you best).