I don't know really about your code but did you try out the following suggestions
http://msdn.microsoft.com/en-us/library/ee230083.aspx
and http://msdn.microsoft.com/en-us/library/ee230085.aspx
http://msdn.microsoft.com/en-us/library/ee230083.aspx
and http://msdn.microsoft.com/en-us/library/ee230085.aspx