Deciphering NullReferenceException or Binding Reference Cycle Errors in Windows Phone 7.1

I recently ran across a very, very difficult problem to diagnose and fix, and I couldn't find this issue going on anywhere else so I thought I'd write about it here in case it comes up again for anyone else.  In a Windows Phone 7.1 (i.e. Mango) application, you have a service reference – in…

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Writing A SharePoint 2010 People Picker Control for Silverlight

One of the sorely missing pieces in the Silverlight toolbox for SharePoint developers is a people picker control.  There is a control that SharePoint provides, which you can use in a web part or custom layouts page (the PeopleEditor class).  Silverlight code though all executes on the client side, so there isn’t an out of…

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