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  • LINQ-to-SQL and SQL Compact - database file sharing problem

    - by Eye of Hell
    Hello. I'm learing LINQ-to-SQL right now and i have wrote a simple application that define SQL data: [Table( Name = "items" )] public class Item { [ Column( IsPrimaryKey = true, IsDbGenerated = true ) ] public int Id; [ Column ] public string Name; } I have launched 2 copy of application connected to the same .sdf file and tested if all database modifications in one application affects another application. But strange thing arise. If i use InsertOnSubmit() and DeleteOnSubmit() in one application, added/removed items are instantly visible in other application via 'select' LINQ queue. But if i try to modify 'Name' field in one application, it is NOT visible in other applicaton until it reconnects the database :(. The test code i use: var Items = from c in db.Items where Id == c.Id select c; foreach( var Item in Items ) { Item.Name = "new name"; break; } db.SubmitChanges(); Can anyone suggest what i'm doing wrong and why InsertOnSubmit()/DeleteOnSubmit works and SubmitChanges() don't?

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  • "Order By" in LINQ-to-SQL Causes performance issues

    - by panamack
    I've set out to write a method in my C# application which can return an ordered subset of names from a table containing about 2000 names starting at the 100th name and returning the next 20 names. I'm doing this so I can populate a WPF DataGrid in my UI and do some custom paging. I've been using LINQ to SQL but hit a snag with this long executing query so I'm examining the SQL the LINQ query is using (Query B below). Query A runs well: SELECT TOP (20) [t0].[subject_id] AS [Subject_id], [t0].[session_id] AS [Session_id], [t0].[name] AS [Name] FROM [Subjects] AS [t0] WHERE (NOT (EXISTS( SELECT NULL AS [EMPTY] FROM ( SELECT TOP (100) [t1].[subject_id] FROM [Subjects] AS [t1] WHERE [t1].[session_id] = 1 ORDER BY [t1].[name] ) AS [t2] WHERE [t0].[subject_id] = [t2].[subject_id] ))) AND ([t0].[session_id] = 1) Query B takes 40 seconds: SELECT TOP (20) [t0].[subject_id] AS [Subject_id], [t0].[session_id] AS [Session_id], [t0].[name] AS [Name] FROM [Subjects] AS [t0] WHERE (NOT (EXISTS( SELECT NULL AS [EMPTY] FROM ( SELECT TOP (100) [t1].[subject_id] FROM [Subjects] AS [t1] WHERE [t1].[session_id] = 1 ORDER BY [t1].[name] ) AS [t2] WHERE [t0].[subject_id] = [t2].[subject_id] ))) AND ([t0].[session_id] = 1) ORDER BY [t0].[name] When I add the ORDER BY [t0].[name] to the outer query it slows down the query. How can I improve the second query? This was my LINQ stuff Nick int sessionId = 1; int start = 100; int count = 20; // Query subjects with the shoot's session id var subjects = cldb.Subjects.Where<Subject>(s => s.Session_id == sessionId); // Filter as per params var orderedSubjects = subjects .OrderBy<Subject, string>( s => s.Col_zero ); var filteredSubjects = orderedSubjects .Skip<Subject>(start) .Take<Subject>(count);

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  • Making an owner-draw button transparent against its arbitrary background in WINCE

    - by EndsOfInvention
    Hi I am trying to place an owner-draw button transparently onto a background. I have no trouble doing this when the background is a solid colour but if the background is an image I cannot seem to get the correct HDC (handle to device context) to Bitblt() the area that button covers. The HDC that is passed as part of the DRAWITEMSTRUCT gives me a button-default-grey area. If I attempt to get the parent of the HWND and then the device context of that i.e pdc = GetDC(GetParent(hWnd)); then the background that gets BitBlt'd is the background of the last painted window. I hope this question makes sense. this is the code I have: pdis = (LPDRAWITEMSTRUCT)(lParam); hdc = pdis->hDC; button = pdis->CtlID - IDC_BUTOFFSET; //pdc = GetDC((hWnd)); pdc = GetDC(GetParent(hWnd)); hbm = CreateCompatibleBitmap(pdc, Buttons_[button]->bc.Size.cx, Buttons_[button]->bc.Size.cy); SelectObject(hdc, hbm); BitBlt(hdc, 0, 0, Buttons_[button]->bc.Size.cx, Buttons_[button]->bc.Size.cy, pdc, Buttons_[button]->bc.Position.x, Buttons_[button]->bc.Position.y, SRCCOPY); TIA Best regards Ends

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  • Issue connecting to SQL Compact Edition on Windows Mobile 6 Emulator

    - by Chad
    I am developing an application for Windows Mobile 6 using an emulator. When I try to open the database connection to the SDF file it is throwing an exception that it is not able to connect or find the file. My questions are: Where on the mobile device is the SDF file supposed to be deployed? Does the SDF file get automatically deployed to the emulator when I build the project (like in then windows forms app) or do I have to do that manually? Any help would be appreciated.

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  • Using Entity Framework for SQL Compact Edition 3.5 does not respect mode=exclusive property of conne

    - by AJ
    I am using SQL Server Compact 3.5 edition with Entity Framework and I want to have exclusive lock on the database as documented here http://msdn.microsoft.com/en-us/library/ms171817.aspx. However when you pass this in a connection string to Entity Framework it does not respect this at all. An example of the connection string as following private static readonly string _ConnectionStringFormat = @"metadata=res://*/Model.csdl|res://*/Model.ssdl|res://*/Model.msl; provider=System.Data.SqlServerCe.3.5; provider connection string='Data Source={0};Mode=Exclusive'"; If anyone has come across this issue before and have found out how to resolve this, then please let me know. Thanks Aj

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  • SQLce DAL Linq to Sql or EntityFramework

    - by bretddog
    Hi, I'm learning databases, using SqlCe, and need business object to database mapping. Currently I try to decide if to use Linq to Sql, or EntityFramework. (I understand a bit L2S, but haven't familiarized with EF yet) The program will only be debeloped and used by myself, so I have good control of the priorities: I don't need to consider potential change of database type or data storage type, as I'm quite certain SQLce will stay sufficient. I DO expect continued development and changes to the data scheme while the program is in active use; change business object properties (Hence database columns), and possibly overall table scheme. So old data must be transported to new scheme. I also want to keep a decent degree of layer separation DAL/BLL, although this may not be necessary, it is good for me to learn these principles. My question is: With these priorities, would I have any benefit by choosing either Linq2Sql vs. EntityFramwork? (and please explain why) Btw, the project involves very simple table scheme with only 4-5 tables and very simple relations. Thanks!

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  • What are the common issues that can cause slow boot times of Windows CE6 Images?

    - by Psychic
    I am relatively new to Platform Builder, and whilst I am able to produce nk.bin files, they boot very slowly, 80-100 seconds, so I think there may be some checkbox somewhere that I need to set (or clear)! I've already removed kitl, profiling, etc in the project settings, and set the project to 'release build' & 'ship'. When I looked at the startup event log (in debug), there doesn't appear to be any specific point where it is slow. The log pretty much scrolls all the way through with no major pauses. One thing I found strange was that although the nk.bin file was a lot smaller in release build (just under 12Mb), the boot time didn't noticeably change from the debug build... The board is a Vortex86DX_60A and I'm building CE6. Are there any 'common builder mistakes' that I may be missing here, or is this going to be something a little deeper?

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  • Where should I catch WM_HIBERNATE and WM_CLOSE in Windows Mobile/WinCE?

    - by afriza
    I have read about Windows Mobile's X button's behaviour, WM_HIBERNATE, and WM_CLOSE on Low Memory Situation. MSDN on WM_HIBERNATE: This message is sent to an application when system resources are running low. An application should attempt to release as many resources as possible when sent this message by unloading dialog boxes, destroying windows, or freeing up as much local storage as possible without changing the internal state. MSDN on WM_CLOSE: This message is sent as a signal that a window or an application should terminate. Where should I catch the message? in the main message pump? in every window? or only some windows? If I am using MFC, where should I catch it?

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  • In native C++, how does one use a SqlCe .sdf database?

    - by Omer Sabic
    Is there a simple way, without .NET? I've found some libraries but none for SqlCe 3.5. There is http://sqlcehelper.codeplex.com/ but it's far from done, since a major feature like using a password is not yet implemented. I've looked at the source and it uses OLEdb to handle the database. The offical Microsoft Northwind example (that is shipped with SQL Compact 3.1, but not with 3.5) also doesn't work, I've tried setting it up with no success. Actually I don't have a sample working code. Was anyone able to set it up paired with a passworded .sdf? What are the alternatives? Thanks.

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  • Construct a LPCWSTR on WinCE in C++ (Zune/ZDK)

    - by James Cadd
    What's a good way to construct an LPCWSTR on WinCE 6? I'd like to find something similar to String.Format() in C#. My attempt is: OSVERSIONINFO vi; memset (&vi, 0, sizeof vi); vi.dwOSVersionInfoSize = sizeof vi; GetVersionEx (&vi); char buffer[50]; int n = sprintf(buffer, "The OS version is: %d.%d", vi.dwMajorVersion, vi.dwMinorVersion); ZDKSystem_ShowMessageBox(buffer, MESSAGEBOX_TYPE_OK); That ZDKSystem_ShowMessageBox refers to the ZDK for hacked Zunes available at: http://zunedevwiki.org This line of code works well with the message box call: ZDKSystem_ShowMessageBox(L"Hello Zune", MESSAGEBOX_TYPE_OK); My basic goal is to look at the exact version of WinCE running on a Zune HD to see which features are available (i.e. is it R2 or earlier?). Also I haven't seen any tags for the ZDK so please edit if something is more fitting!

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  • Can SQL Server Compact be used as both a Source and Destination in SSIS?

    - by Rich
    I'm wondering if SQL Server Compact Edition can be used as both a Source and Destination in an SSIS dataflow. I know I can setup a SQLMOBILE connection manager, and I've found some information that mentions using it as a Destination, but nothing on using it as a Source. What I'm looking to do is to transfer data from one SQL Server Compact file to another.

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  • How do I select the first row per group in an SQL Query?

    - by mafutrct
    I've got this SQL query: SELECT Foo, Bar, SUM(Values) AS Sum FROM SomeTable GROUP BY Foo, Bar ORDER BY Foo DESC, Sum DESC This results in an output similar to this: 47 1 100 47 0 10 47 2 10 46 0 100 46 1 10 46 2 10 44 0 2 I'd like to have only the first row per Foo and ignore the rest. 47 1 100 46 0 100 44 0 2 How do I do that?

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  • Delete a Row from a DataGridView given its index

    - by Ruben Trancoso
    My DataGridView is a single line selection and theres a rowEnter Event where I get the line index every time the selected line changes. private void rowEnter(object sender, DataGridViewCellEventArgs e) { currentRowIndex = e.RowIndex; } when I press a delete button I use the same index to delete the row myDataSet.Avaliado.Rows[currentRowIndex].Delete(); avaliadoTableAdapter.Update(myDataSet.Avaliado); it works fine if no column in the DataGridView is sorted, otherwise a get an error. What should be the way to know the row index in the dataset that corresponds to the rowindex from the DataGridView?

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  • How can i Update /Get values in windows form while moving one form to other form(like cookies)?

    - by Jeyavel
    Hi, How can i Update /Get values in windows form while moving one form to other form(like cookies)? i need to update the values to some variable and again i am going to refer stored values and need to do some calculations. i have used Cookies in ASP.Net but i am not able to find out same concept in C#.net Windows forms . can any one help me for resolve this issues? Regards, Jeyavel N

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  • SQL Compact - Hang on invalid file

    - by eWolf
    I use Linq to Sql Compact with code generated by sqlmetal. When I open an invalid database, like eg an mp3, I can create the DataContext without getting an Exception. But when I query any data or call DatabaseExists, the application hangs. Why is no exception thrown? Is this a known problem?

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  • WinCE and PC USB communication

    - by sebeksd
    We are developing some device and we need to find good solution for one of needed functionality. Thing is that we need communicate WinCE 6.0 (ARM) and Windows on PC. Easiest way is of course COM port but in our case it is impossible (all serial ports are used on WinCE and we don't want to add one more). Second option is LAN but for us it is not the best option for few reasons. So there is third option we could use. USB to USB communication but how to do that ? Of course WinCE is USB Device and PC is USB Host so all hardware basics are meet. We could use Active sync but there are few problems with it: - WinCE 6.0 is not working with WMDC (drivers on device just crash after connecting device with PC) and I didn't find any solution for it so in this case we need to use WinXP on PC side (old ActiveSync) - we need to filter communication with active sync to only our application, no other non authorized software should be allowed (what I know this is imposible to obtain). So propably best way to do what we need is to communicate throug USB like standard COM (serial communication). The question is, how it could be made, are we need to write driver on WinCE and also a Driver on Windows (PC), or there are better solution? Maybe some driver for WinCE 6.0 that would emulate Virtual COM on PC side (and of course allow standard Read/Write to it on WinCE side) ? Could someone tell me if something like that exists ?

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  • Entity Framework 4 and SQL Compact 4: How to generate database?

    - by David Veeneman
    I am developing an app with Entity Framework 4 and SQL Compact 4, using a Model First approach. I have created my EDM, and now I want to generate a SQL Compact 4.0 database to act as a data store for the model. I bring up the Generate Database Wizard and click the New Connection button to create a connection for the generated file. The Choose Data Source dialog appears, but SQL Compact 4.0 is not listed in the list of available data sources: I am running VS 2010 SP1 (beta) and I have installed the VS 2010 Tools for SQL Compact 4.0. I can create a SQL Compact 4.0 data connection from the Server Explorer. It is only in the Generate Database Wizard that the 4.0 option doesn't appear. BTW, my SQL Compact 4.0 installation does include System.Data.SqlServerCe.Entity.dll. So I should have the SQL Compact components I need. Am I doing something incorrectly, or is this a bug? Does anyone have a fix or a workaround? Thanks for your help.

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  • Sql Server Compact Edition version error.

    - by Tim
    I am working on .NET ClickOnce project that uses Sql Server 2005 Compact Edition to synchronize remote data through the use of a Merge replication. This application has been live for nearly a year now, and while we encounter occasional synchronization errors, things run quite smoothly for the most part. Yesterday a user reported an error that I have never seen before and have yet to find any information for online. Many users synchronize every night, and I haven't received error reports from anyone else, so this issue must be isolated to this particular user / client machine. Here are the full details of the error: -Error Code : 80004005 -Message : The message contains an unexpected replication operation code. The version of SQL Server Compact Edition Client Agent and SQL Server Compact Edition Server Agent should match. [ replication operation code = 31 ] -Minor Error : 28526 -Source : Microsoft SQL Server Compact Edition -Numeric Parameters : 31 One interesting thing that I've found is that his data does get synchronized to the server, so this error must occur after the upload completes. I have yet to determine whether or not changes at the server are still being downloaded to his subscription. Thinking that maybe there was some kind of version conflict going on, I had a remote desktop session with this user last night and uninstalled both the application and the SQL Server Compact Edition prerequisite, then reinstalled both from our ClickOnce publication site. I also removed his existing local database file so that upon synchronization, an entirely new subscription would be issued to him. Still his errors continue. I suppose the error may be somewhat general, and the text in the error message stating that the versions should match may not necessarily reflect the problem at hand. This site contains the only official reference to this error that I've been able to find, and it offers no more detail than the error message itself. Has anyone else encountered this error? Or at least know more about SQL Compact to have a better guess as to what is going on here? Any help / suggestions will be greatly appreciated!

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  • Will NKDbgPrintfW be compiled to nop in release build?

    - by Johann Gerell
    I know about and have used the macros DEBUGMSG, RETAILMSG, ERRORMSG, that all take a condition parameter. For general formatted debug output, though, I want to use ::NKDbgPrintfW directly and wonder if someone knows if it compiles to a nop in optimised release builds or if my own macro wrapper around it with #ifdef DEBUG is still needed?

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