http://blogs.msdn.com/sqlservercompact/archive/2009/05/06/troubleshooting-access-violation-exception-while-using-sql-server-compact-database-with-ado-net-provider.aspxPossible causes for Access Violation exception in general: An access violation occurs in unmanaged or unsafe code when the code attempts to read or write to memory that has not been allocated, or to which it does not have access. This usually occurs becauseen-USCommunityServer 2.1 SP1 (Build: 61025.2)