What can I do to resolve a “Row not found or changed” Exception in LINQ to SQL on a SQL Server?

The query generates the following SQL: UPDATE [Sessions] SET [Is_Active] = @p0, [Disconnected] = @p1 WHERE 0 = 1 -- @p0: Input Boolean (Size = 0; Prec = 0; Scale = 0) [False] -- @p1: Input DateTime (Size = 0; Prec = 0; Scale = 0) [9/4/2008 5:12:02 PM] -- Context: SqlProvider(SqlCE) Model: AttributedMetaModel Build: 3.5.21022.8 The obvious problem is the WHERE 0=1, After the record was loaded, I've confirmed that all the properties in the "deviceSessionRecord" are correct to include the primary key. Also when catching the "ChangeConflictException" there is no additional information about why this failed. I've also confirmed that this exception get's thrown with exactly one record in the database (the record I'm attempting to update) I solved this error by redragging over a table from the server explorer to the designer and re-building. or change nullable value.