myposter.ReturnUrlChange += new vvBMTAutoPost.ReturnUrlChangedEventHandler(MyReturnUrlChangedEvent);

private void MyReturnUrlChangedEvent(object sender, ReturnUrlChangeEventArgs returnurl)
		{
			//do whatever you want here...
			Print ("Change detected "+returnurl);
                        //this prints the returnurl, three values are possible: 
                        //"Working" , "Error" and the actual img wrapped url of the uploaded img.
		}

private vvBMTAutoPost myposter = new vvBMTAutoPost();

myposter.makepost(...
and myposter.makeimgpost(...

myposter.ErrorCodeChange += new vvBMTAutoPost.ErrorCodeChangedEventHandler(MyErrorCodeChangedEvent);

private void MyErrorCodeChangedEvent(object sender, ErrorCodeChangeEventArgs error)
		{
			//do whatever you want here...
			Print ("Change detected "+error.ErrorCode);//this prints the change detect and the error code
		}

myposter.ErrorCodeChange -= new vvBMTAutoPost.ErrorCodeChangedEventHandler(MyErrorCodeChangedEvent);