Question

I have a class ‘userdetails’ which is having a event called ‘detailschanged’. It will be raised whenever the user detail changes.
When i am creating a new object of ‘userdetails’ (objUserDetails) in my new form, i ll subscribe to event ‘detailschanged’ to indicate the user about the datachange.

objUserDetails.detailschanged += InformtoUser

InformtoUser is a method in new form. In InformtoUser method i am accessing form’s control(say label’s text property).
When the control is accessed I am getting ‘Cross Thread Operation’ error.
How to avoid this cross thread operation??

Answer 1

UI controls can only be updated from UI thread.
If you are working with WinForms you should do:

mycontrol.Invoke((MethodInvoker)(() =>
{
  mycontrol.Text="some text";
}));

And if you are in WPF then you should use the dispatcher:

myControl.Dispatcher.BeginInvoke(DispatcherPriority.Background, new Action(() => myControl.Text = ""));