sql-server-ce-4

I'm building a .NET 4 WPF application using Entity Framework code first and SQL Server Compact 4.0. I'm trying to call DbContext.SaveChanges() on a background thread to avoid blocking the UI, but I'm occasionally getting the following exception: System.AccessViolationException occurred Message=Attempted to read or write protected memory. This is often an indication that other memory is corrupt. Source=System.Data.SqlServerCe StackTrace: at System.Data.SqlServerCe.NativeMethodsHelper.OpenStore(IntPtr pOpenInfo, IntPtr pfnOnFlushFailure, IntPtr& pStoreService, IntPtr& pStoreServer, IntPtr&

I seldomly use SQL and I cannot find anything similar in my archive so I'm asking this simple query question: I need a query which one returns personID and only the first seenTime Records: seenID | personID | seenTime 108 3 13:34 109 2 13:56 110 3 14:22 111 3 14:31 112 4 15:04 113 2 15:52 Wanted result: personID | seenTime 3 13:34 2 13:56 4 15:04 That's what I did & failed: SELECT t.attendanceID, t.seenPersonID, t.seenTime (SELECT ROW_NUMBER() OVER (PARTITION BY seenID ORDER BY seenID) AS RowNo, seenID, seenPersonID, seenTime FROM personAttendances) t WHERE t.RowNo=1 P.S: Notice SQL CE 4 If

What is the correct way to save a graph of objects whose state you don't know? By state I mean whether they are new or existing database entries that are being updated. For instance, if I have: public class Person { public int Id { get; set; } public int Name { get; set; } public virtual ICollection<Automobile> Automobiles { get; set; } } public class Automobile { public int Id { get; set; } public int Name { get; set; } public short Seats { get; set; } public virtual ICollection<MaintenanceRecord> MaintenanceRecords { get; set ;} public virtual Person Person { get; set; } } public class

I develop some application that needs SQL Server CE 4.0 installed. I do all job under Windows 7 64-bit so I have installed SQL Server CE 4.0 64-bit. How I can do some checking if there is installed SQL Server CE 4.0 32-bit/64-bit when I start the application/or installer? Which is the approach in general? Any clue, articles and etc? Thanks!! P.S. I read this link How can InstallShield check if SQL Server 2005 (3.1) Compact Edition (CE) is installed but it doesn't help. Just include all the required files with your app, and it will run on both x86 and x64 - see my blog post here: http://erikej

I'm inserting a lot of data into SQL Server CE 4.0 using Entity Framework 4.2 (code-first), and the performance is abysmal when compared to direct SQL insertion. The model is very simple: public class DocMember { public DocMember() { this.Items = new List<DocItem>(); } public int Id { get; set; } public string Name { get; set; } public string MemberType { get; set; } public string AssemblyName { get; set; } public virtual IList<DocItem> Items { get; set; } } public class DocItem { public int Id { get; set; } public DocMember Member { get; set; } public string PartType { get; set; } public