What's wrong with my LinqDataSource? - Method not found!

I've been having a very weird problem in Visual Studio 2008 when trying to use the automatic operations for the Linqdatasource (insert, update or delete).

It seems that no matter what I try I get this weird "Method not found" problem.

Unfortunately there doesn't seem to be a lot of help out on the web about why this may be happening.

I'm starting to think that there may be something goofed up with my 3.5 Framework or Visual Studio 2008.

Here's the error and a link to the problem I posted out on the ASP.NET forums.

If anybody has come across this weird problem let me know.

Unfortunately the 1 person that has replied on the discussion forums hasn't been much help and offers up only basic suggestions as to why it may not be working, all of which were things that I had already known or tried right off the bat.

System.MissingMethodException: Method not found: 'System.Object System.Web.UI.WebControls.Parameter.GetValue(System.Object, Boolean)'.

Generated: Mon, 04 Aug 2008 12:40:10 GMT
System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.MissingMethodException: Method not found: 'System.Object System.Web.UI.WebControls.Parameter.GetValue(System.Object, Boolean)'.
at System.Web.UI.WebControls.LinqDataSourceView.MergeDictionaries(Object dataObjectType, ParameterCollection reference, IDictionary source, IDictionary destination, IDictionary destinationCopy)
at System.Web.UI.WebControls.LinqDataSourceView.BuildInsertDataObject(Object table, IDictionary values)
at System.Web.UI.WebControls.LinqDataSourceView.ExecuteInsert(IDictionary values)
at System.Web.UI.DataSourceView.Insert(IDictionary values, DataSourceViewOperationCallback callback)
at System.Web.UI.WebControls.FormView.HandleInsert(String commandArg, Boolean causesValidation)
at System.Web.UI.WebControls.FormView.HandleEvent(EventArgs e, Boolean causesValidation, String validationGroup)
at System.Web.UI.WebControls.FormView.OnBubbleEvent(Object source, EventArgs e)
at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
at System.Web.UI.WebControls.FormViewRow.OnBubbleEvent(Object source, EventArgs e)
at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
at System.Web.UI.WebControls.LinkButton.OnCommand(CommandEventArgs e)
at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument)
at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
--- End of inner exception stack trace ---
at System.Web.UI.Page.HandleError(Exception e)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest()
at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context)
at System.Web.UI.Page.ProcessRequest(HttpContext context)
at ASP.sellyourhome\_aspx.ProcessRequest(HttpContext context)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)