Sometimes when we try to update UI elements from a different thread in Silverlight( asynchronous callbacks such as xml, json, WCF), we will run into invalid cross-thread access error if a “Dispatcher.BeginInvoke” is not used.

In most cases we can use the following and it will work fine.

this.Dispatcher.BeginInvoke(delegate()
            {
                //do something here
            });

However, this won’t work on static functions/methods, because for the most obvious reason, “this” can not be used in static function.

System.Windows.Deployment.Current.Dispatcher.BeginInvoke(delegate()
                {
                   //do something here
                });