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  • March 2010 Meeting of Israel Dot Net Developers User Group (IDNDUG)

    - by Jackie Goldstein
    Note the special date of this meeting - Wednesday March 24, 2010 For our March 2010 meeting of the Israel Dot Net Developers User Group we have the opportunity for a special meeting with Brad Abrams from Microsoft Corp, who will in Israel for the Developer Academy 4 event. Our user group meeting will be held on Wednesday March 24, 2010 .   This meeting will focus on building Line of Business applications with Silverlight 4, RIA Services and VS2010. Abstract: Building Business Applications...(read more)

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  • ASP.NET MVC: Using ProfileRequiredAttribute to restrict access to pages

    - by DigiMortal
    If you are using AppFabric Access Control Services to authenticate users when they log in to your community site using Live ID, Google or some other popular identity provider, you need more than AuthorizeAttribute to make sure that users can access the content that is there for authenticated users only. In this posting I will show you hot to extend the AuthorizeAttribute so users must also have user profile filled. Semi-authorized users When user is authenticated through external identity provider then not all identity providers give us user name or other information we ask users when they join with our site. What all identity providers have in common is unique ID that helps you identify the user. Example. Users authenticated through Windows Live ID by AppFabric ACS have no name specified. Google’s identity provider is able to provide you with user name and e-mail address if user agrees to publish this information to you. They both give you unique ID of user when user is successfully authenticated in their service. There is logical shift between ASP.NET and my site when considering user as authorized. For ASP.NET MVC user is authorized when user has identity. For my site user is authorized when user has profile and row in my users table. Having profile means that user has unique username in my system and he or she is always identified by this username by other users. My solution is simple: I created my own action filter attribute that makes sure if user has profile to access given method and if user has no profile then browser is redirected to join page. Illustrating the problem Usually we restrict access to page using AuthorizeAttribute. Code is something like this. [Authorize] public ActionResult Details(string id) {     var profile = _userRepository.GetUserByUserName(id);     return View(profile); } If this page is only for site users and we have user profiles then all users – the ones that have profile and all the others that are just authenticated – can access the information. It is okay because all these users have successfully logged in in some service that is supported by AppFabric ACS. In my site the users with no profile are in grey spot. They are on half way to be users because they have no username and profile on my site yet. So looking at the image above again we need something that adds profile existence condition to user-only content. [ProfileRequired] public ActionResult Details(string id) {     var profile = _userRepository.GetUserByUserName(id);     return View(profile); } Now, this attribute will solve our problem as soon as we implement it. ProfileRequiredAttribute: Profiles are required to be fully authorized Here is my implementation of ProfileRequiredAttribute. It is pretty new and right now it is more like working draft but you can already play with it. public class ProfileRequiredAttribute : AuthorizeAttribute {     private readonly string _redirectUrl;       public ProfileRequiredAttribute()     {         _redirectUrl = ConfigurationManager.AppSettings["JoinUrl"];         if (string.IsNullOrWhiteSpace(_redirectUrl))             _redirectUrl = "~/";     }              public override void OnAuthorization(AuthorizationContext filterContext)     {         base.OnAuthorization(filterContext);           var httpContext = filterContext.HttpContext;         var identity = httpContext.User.Identity;           if (!identity.IsAuthenticated || identity.GetProfile() == null)             if(filterContext.Result == null)                 httpContext.Response.Redirect(_redirectUrl);          } } All methods with this attribute work as follows: if user is not authenticated then he or she is redirected to AppFabric ACS identity provider selection page, if user is authenticated but has no profile then user is by default redirected to main page of site but if you have application setting with name JoinUrl then user is redirected to this URL. First case is handled by AuthorizeAttribute and the second one is handled by custom logic in ProfileRequiredAttribute class. GetProfile() extension method To get user profile using less code in places where profiles are needed I wrote GetProfile() extension method for IIdentity interface. There are some more extension methods that read out user and identity provider identifier from claims and based on this information user profile is read from database. If you take this code with copy and paste I am sure it doesn’t work for you but you get the idea. public static User GetProfile(this IIdentity identity) {     if (identity == null)         return null;       var context = HttpContext.Current;     if (context.Items["UserProfile"] != null)         return context.Items["UserProfile"] as User;       var provider = identity.GetIdentityProvider();     var nameId = identity.GetNameIdentifier();       var rep = ObjectFactory.GetInstance<IUserRepository>();     var profile = rep.GetUserByProviderAndNameId(provider, nameId);       context.Items["UserProfile"] = profile;       return profile; } To avoid round trips to database I cache user profile to current request because the chance that profile gets changed meanwhile is very minimal. The other reason is maybe more tricky – profile objects are coming from Entity Framework context and context has also HTTP request as lifecycle. Conclusion This posting gave you some ideas how to finish user profiles stuff when you use AppFabric ACS as external authentication provider. Although there was little shift between us and ASP.NET MVC with interpretation of “authorized” we were easily able to solve the problem by extending AuthorizeAttribute to get all our requirements fulfilled. We also write extension method for IIdentity that returns as user profile based on username and caches the profile in HTTP request scope.

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  • Back to Basics: Structuring a Web Page with CSS and ASP.NET

    Nick Harrison explains why such habits as using nested HTML Tables to position content in the right place on the browser page is bad practice and, nowadays, avoidable. This is just one 'Markup smell' that he discusses on the way to demonstrating the benefits of CSS Style-sheets and ASP.NET Master Pages. span.fullpost {display:none;}

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  • Google Chrome Loses ASP.NET Sessions - Need FavIcon

    - by nannette
    I had programmed a brilliant web page in ASP.NET 4.0 and lo and behold, this one page lost its sessions in Google Chrome. I could run it locally in debug and could not reproduce the issues in Chrome. Didn't happen in IE or Firefox, only Chrome on the published server. I finally found in a forum where someone mentioned that Google Chrome looks for favicons and if it doesn't find one it will throw a 302 redirect and kill the session. http://stackoverflow.com/questions/8247842/session-data-lost-in-chrome...(read more)

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  • Ninject & Entity Framework =(sometimes) "The ObjectContext instance has been disposed ..."

    - by n26
    I am using Ninject and ADO.Net Entity Framework in my Aps.Net (Mvc) website. I bind the ObjectContext to Ninject using the RequestScope: Bind<Entities>().ToSelf().InRequestScope().WithConstructorArgument("connectionString", _connectionString); In most cases this works perferct. But sometimes I got the following error: The ObjectContext instance has been disposed and can no longer be used for operations that require a connection. This error occurs at different positions while getting, updating, inserting or deleting data. In some cases this error occurs until I reset my webapp and sometimes it disappears after some requests. I am displeased that I have no more details. Because it seems that there is no pattern when and where this error occurs. Because the time and position is allways different :( Some hints or ideas?

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  • Zend Studio Intellisense + zend Framework

    - by Ilya Biryukov
    Hi. I've got a very annoying problem with my Zend studio. I have a zend framework project I am working on. The actual zend framework code is inside my project (in library folder) and then ZS seems to reference to its own version of zend framework. As the result, I get 2 versions of the same function/class in my intellisense which is annoying to say the least. Today I had the last drop of patience with zend studio when I showed 4 copies of the same class (imagine what's its like looking at a large namespace times 4!). So, how do I remove all references inside ZS to its own version of ZF? Thanks!

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  • VS 2010 and Entity Framework: accessing SQL Server 2000 databases

    - by pcampbell
    Consider a Visual Studio 2010 project whose requirement is to model the data using Entity Framework. The datasource is a SQL Server 2000 database. The first step is creating a new ADO.NET Entity Data Model item. The Entity Data Model Wizard prompts for a Data Connection. When creating a new Connection, you will need to use a provider other than SqlClient. Usually it's SQLOLEDB. The list of data providers only has SqlClient or ".NET Framework Data Provider for SQL Server". Is there a work-around for Visual Studio 2010 to create or use data connections to SQL Server 2000 using the Entity Framework?

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  • How to create an Entity Framework model from an existing SQLite database in Visual Studio 2008?

    - by splattne
    I've installed the System.Data.SQLite ADO.NET Provider from http://sqlite.phxsoftware.com/. I can connect to the database from within Visual Studio, I can open table schemas, views etc. I'd like to use an existing SQLite database to create an Entity Framework model in Visual Studio 2008. When I try to create a new ADO.NET Entity Data Model (.edmx) file using the wizard, the existing SQLite connection is not in the list though. Also, it's not possible to create a SQLite connection because there is no provider for SQLite. It only lists SQL Server, SQL Server file and SQL Server Compact 3.5. Any idea how to solve this problem?

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  • Using Structuremap to manage ObjectContext Lifetime in ASP.NET MVC

    - by Diego Correa
    Hi, what I want to know If there is a way or an good article on how to manage the objectcontext life cycle through structuremap (I saw an example with ninject). Since I'm new to the methods and possibilities of SM I really don't know How/If possible to make it. In the first moment I wanted to make a singleton of the objectcontext per httpcontext. Thanks for any advice.

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  • Adding bindingRedirect element in web.config when upgrading from asp.net mvc 1 to asp.net mvc 2

    - by mallows98
    Hi all, I have got a question with regards to upgrading asp.net mvc applications from v1 to v2... I've noticed in the ASP.NET MVC v2 Release notes that we need to add this code (please see below) when upgrading, but it did not state what would be the purpose of it because I've tried experimenting some of my apps to asp.net mvc 2 without adding this particular section in web.config. <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <dependentAssembly> <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35"/> <bindingRedirect oldVersion="1.0.0.0" newVersion="2.0.0.0"/> </dependentAssembly> </assemblyBinding> </runtime> Would there be implications should I not place this? Thanks!

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  • C# asp.net EF MVC postgresql error 23505: Duplicate key violates unique constraint

    - by user2721755
    EDIT: It was issue with database table - dropping and recreating table id column did the work. Problem solved. I'm trying to build web application, that is connected to postgresql database. Results are displaying in view with Kendo UI. When I'm trying to add new row (with Kendo UI 'Add new record' button), I get error 23505: 'Duplicate key violates unique constraint'. My guess is, that EF takes id to insert from the beginning, not the last one, because after 35 (it's number of rows in table) tries - and errors - adding works perfectly. Can someone help me to understand, what's wrong? Model: using System.ComponentModel.DataAnnotations; using System.ComponentModel.DataAnnotations.Schema; namespace MainConfigTest.Models { [Table("mainconfig", Schema = "public")] public class Mainconfig { [Column("id")] [Key] [Editable(false)] public int Id { get; set; } [Column("descr")] [Editable(true)] public string Descr { get; set; } [Column("hibversion")] [Required] [Editable(true)] public long Hibversion { get; set; } [Column("mckey")] [Required] [Editable(true)] public string Mckey { get; set; } [Column("valuexml")] [Editable(true)] public string Valuexml { get; set; } [Column("mcvalue")] [Editable(true)] public string Mcvalue { get; set; } } } Context: using System.Data.Entity; namespace MainConfigTest.Models { public class MainConfigContext : DbContext { public DbSet<Mainconfig> Mainconfig { get; set; } } } Controller: namespace MainConfigTest.Controllers { public class MainConfigController : Controller { #region Properties private Models.MainConfigContext db = new Models.MainConfigContext(); private string mainTitle = "Mainconfig (Kendo UI)"; #endregion #region Initialization public MainConfigController() { ViewBag.MainTitle = mainTitle; } #endregion #region Ajax [HttpGet] public JsonResult GetMainconfig() { int take = HttpContext.Request["take"] == null ? 5 : Convert.ToInt32(HttpContext.Request["take"]); int skip = HttpContext.Request["skip"] == null ? 0 : Convert.ToInt32(HttpContext.Request["skip"]); Array data = (from Models.Mainconfig c in db.Mainconfig select c).OrderBy(c => c.Id).ToArray().Skip(skip).Take(take).ToArray(); return Json(new Models.MainconfigResponse(data, db.Mainconfig.Count()), JsonRequestBehavior.AllowGet); } [HttpPost] public JsonResult Create() { try { Mainconfig itemToAdd = new Mainconfig() { Descr = Convert.ToString(HttpContext.Request["Descr"]), Hibversion = Convert.ToInt64(HttpContext.Request["Hibversion"]), Mckey = Convert.ToString(HttpContext.Request["Mckey"]), Valuexml = Convert.ToString(HttpContext.Request["Valuexml"]), Mcvalue = Convert.ToString(HttpContext.Request["Mcvalue"]) }; db.Mainconfig.Add(itemToAdd); db.SaveChanges(); return Json(new { Success = true }); } catch (InvalidOperationException ex) { return Json(new { Success = false, msg = ex }); } } //other methods } } Kendo UI script in view: <script type="text/javascript"> $(document).ready(function () { $("#config-grid").kendoGrid({ sortable: true, pageable: true, scrollable: false, toolbar: ["create"], editable: { mode: "popup" }, dataSource: { pageSize: 5, serverPaging: true, transport: { read: { url: '@Url.Action("GetMainconfig")', dataType: "json" }, update: { url: '@Url.Action("Update")', type: "Post", dataType: "json", complete: function (e) { $("#config-grid").data("kendoGrid").dataSource.read(); } }, destroy: { url: '@Url.Action("Delete")', type: "Post", dataType: "json" }, create: { url: '@Url.Action("Create")', type: "Post", dataType: "json", complete: function (e) { $("#config-grid").data("kendoGrid").dataSource.read(); } }, }, error: function (e) { if(e.Success == false) { this.cancelChanges(); } }, schema: { data: "Data", total: "Total", model: { id: "Id", fields: { Id: { editable: false, nullable: true }, Descr: { type: "string"}, Hibversion: { type: "number", validation: {required: true,}, }, Mckey: { type: "string", validation: { required: true, }, }, Valuexml:{ type: "string"}, Mcvalue: { type: "string" } } } } }, //end DataSource // generate columns etc. Mainconfig table structure: id serial NOT NULL, descr character varying(200), hibversion bigint NOT NULL, mckey character varying(100) NOT NULL, valuexml character varying(8000), mcvalue character varying(200), CONSTRAINT mainconfig_pkey PRIMARY KEY (id), CONSTRAINT mainconfig_mckey_key UNIQUE (mckey) Any help will be appreciated.

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  • C#: How to set AsyncWaitHandle in Compact Framework?

    - by Thorsten Dittmar
    Hi, I'm using a TcpClient in one of my Compact Framework 2.0 applications. I want to receive some information from a TCP server. As the Compact Framework does not support the timeout mechanisms of the "large" framework, I'm trying to implement my own timeout-thing. Basically, I want to do the following: IAsyncResult result = client.BeginRead(buffer, 0, size, ..., stream); if (!result.AsyncWaitHandle.WaitOne(5000, false)) // Handle timeout private void ReceiveFinished(IAsyncResult ar) { NetworkStream stream = (NetworkStream)ar.AsyncState; int numBytes = stream.EndRead(ar); // SIGNAL IASYNCRESULT.ASYNCWAITHANDLE HERE ... HOW?? } I'd like to call Set for the IAsyncResult.AsyncWaitHandle, but it doesn't have such a method and I don't know which implementation to cast it to. How do I set the wait handle? Or is it automatically set by calling EndRead? The documentation suggests that I'd have to call Set myself... Thanks for any help!

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  • What would cause ANY .NET application to crash immediately... except a project I create and Debug in

    - by blak3r
    My software recently got deployed to a customer who said that the application was crashing immediately after it started. After some initial debugging, the customer provided me remote access to one of the computers which was unable to run the application. I found that the crash wasn't specific to my application. Any application which depended on the .NET framework crashed immediately. Conveniently, Visual Studio 2008 was installed so I created a quick hello world application on it and clicked Debug. The application worked fine. But, then when I tried to execute the generated binaries in the /bin/Debug/HelloWorld.exe directory outside of visual studio it crashed. List of things i've tried (UPDATED): I checked that "Everyone" has Read&Execute permissions for c:\Windows. To test that the problem was with the .NET Framework (and not my application), I attempted to download Paint .NET on to the computers. The setup frontend crashed in the same manner. Performed a repair of the .NET framework as outlined in http://support.microsoft.com/kb/908077 (Boy was this fun and time consuming). No luck. Installed .NET 3.5 SP1 (before it just had .NET 3.5) Note: my application targets 2.0 so I did this more as a long shot... but i learned in the process that .NET 3.5 SP1 also updates the underlying frameworks. Ran Aaron Stebner's .NET Setup Verification Tool. This tool indicated that .NET was successfully installed. (I forget if i checked all the versions but at least 2.0 worked). Tested some mini hello world applications which were targeted for .NET 2.0 and .NET 3.5 and both crashed in the same way. Tried launching .NET apps via windbg cmd line. Doing this did allow me invoke my simple hello world applications. So, simple .NET hello world works when invoked by windbg or by launching via debug in visual studio... but doesn't if i try to execute it standalone. I created a dump file using WinDbg. It wasn't all that revealing to me. FAULTING_IP: mscorwks!PEImage::GetEntryPointToken+21 79f4ff9d f6401010 test byte ptr [eax+10h],10h EXCEPTION_RECORD: 0012f710 -- (.exr 0x12f710) ExceptionAddress: 79f4ff9d (mscorwks!PEImage::GetEntryPointToken+0x00000021) ExceptionCode: c0000005 (Access violation) ExceptionFlags: 00000000 NumberParameters: 2 Parameter[0]: 00000000 Parameter[1]: 00000010 Attempt to read from address 00000010 FAULTING_THREAD: 00000b44 PROCESS_NAME: MyProcess.exe ERROR_CODE: (NTSTATUS) 0x80000003 - {EXCEPTION} Breakpoint A breakpoint has been reached. EXCEPTION_CODE: (HRESULT) 0x80000003 (2147483651) - One or more arguments are invalid DETOURED_IMAGE: 1 NTGLOBALFLAG: 0 APPLICATION_VERIFIER_FLAGS: 0 MANAGED_STACK: !dumpstack -EE OS Thread Id: 0xb44 (0) Current frame: ChildEBP RetAddr Caller,Callee EXCEPTION_OBJECT: !pe cb10b4 Exception object: 00cb10b4 Exception type: System.ExecutionEngineException Message: <none> InnerException: <none> StackTrace (generated): <none> StackTraceString: <none> HResult: 80131506 MANAGED_OBJECT_NAME: System.ExecutionEngineException CONTEXT: 0012f72c -- (.cxr 0x12f72c) eax=00000000 ebx=00000000 ecx=00000000 edx=0000000e esi=001a1490 edi=00000001 eip=79f4ff9d esp=0012f9f8 ebp=0012fa1c iopl=0 nv up ei pl zr na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010246 mscorwks!PEImage::GetEntryPointToken+0x21: 79f4ff9d f6401010 test byte ptr [eax+10h],10h ds:0023:00000010=?? Resetting default scope READ_ADDRESS: 00000010 FOLLOWUP_IP: mscorwks!PEImage::GetEntryPointToken+21 79f4ff9d f6401010 test byte ptr [eax+10h],10h BUGCHECK_STR: APPLICATION_FAULT_NULL_CLASS_PTR_DEREFERENCE_SHUTDOWN PRIMARY_PROBLEM_CLASS: NULL_CLASS_PTR_DEREFERENCE_SHUTDOWN DEFAULT_BUCKET_ID: NULL_CLASS_PTR_DEREFERENCE_SHUTDOWN LAST_CONTROL_TRANSFER: from 79ef02b5 to 79f4ff9d STACK_TEXT: 79f4ff9d mscorwks!PEImage::GetEntryPointToken+0x21 79ef02b5 mscorwks!PEFile::GetEntryPointToken+0xa0 79eefeaf mscorwks!SystemDomain::ExecuteMainMethod+0xd4 79fb9793 mscorwks!ExecuteEXE+0x59 79fb96df mscorwks!_CorExeMain+0x15c 7900b1b3 mscoree!_CorExeMain+0x2c 7c817077 kernel32!BaseProcessStart+0x23 SYMBOL_STACK_INDEX: 0 SYMBOL_NAME: mscorwks!PEImage::GetEntryPointToken+21 FOLLOWUP_NAME: MachineOwner MODULE_NAME: mscorwks IMAGE_NAME: mscorwks.dll DEBUG_FLR_IMAGE_TIMESTAMP: 471ef729 STACK_COMMAND: .cxr 0012F72C ; kb ; dds 12f9f8 ; kb FAILURE_BUCKET_ID: NULL_CLASS_PTR_DEREFERENCE_SHUTDOWN_80000003_mscorwks.dll!PEImage::GetEntryPointToken BUCKET_ID: APPLICATION_FAULT_NULL_CLASS_PTR_DEREFERENCE_SHUTDOWN_DETOURED_mscorwks!PEImage::GetEntryPointToken+21 WATSON_STAGEONE_URL: http://watson.microsoft.com/StageOne/MyProcess_exe/2_4_4_39/4a8a192c/unknown/0_0_0_0/bbbbbbb4/80000003/00000000.htm?Retriage=1 Followup: MachineOwner Edit 1:The event log details for this error say it's a .NET Runtime version 2.0.50727.3053 - Fatal Execution Engine Error (7A097706)(80131506). Edit 2 (10-7-09): This issue is still active. Edit 3 (3-29-10): This update is to let everyone know that I never did successfully solve the problem. The customer who's machine this was on lost interest in solving it and just reimaged the machine :(. Thanks for all the contributions though.

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  • Multi page forms on ASP.NET MVC

    - by Jay
    Hi, I have decided to use ASP.NET MVC to develop multi page (registration) forms in asp.net. There will be two buttons on each page that allows the user to navigate to the previous and next page. When the user navigates back to a page they recently filled out, the data should be displayed to them. I understand ASP.NET MVC should remain stateless but how should I maintain page information when the user navigates back and forth. Should I? Save the information to a database and retrieve information for each page change? save information to the session? Load all the fields and display only whats's needed with javascript? This registration form is going to be used in multiple sites but with different sets of questions (Some may be the same). IF performance is a main concern, should I avoid generating these forms dynamically? Jay

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  • Entity Framework + SQLite deployment

    - by Pompair
    Hi, I have a ASP.NET MVC app that is using SQLite database through Entity Framework. Everything works on VS 2008's local development webserver. However, deploying the web app to my service provider causes this error: [ArgumentException: Unable to find the requested .Net Framework Data Provider. It may not be installed.] System.Data.Common.DbProviderFactories.GetFactory(String providerInvariantName) +1308959 System.Data.EntityClient.EntityConnection.GetFactory(String providerString) +35 Service provider has commented that they do not support SQLite. I had though that SQLite is independent of service provider's settings since it's App_Data deployable. Has anyone experiences of a succesfull Entity Framework + SQLite deployment? Cheers, -pom-

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  • trying to decide between asp.net and jsp

    - by Amir
    Hey Guys, I am wondering if anyone can shed some lights on the situation. I am about to start a project and trying to figure out what solution is best to go with asp.net or java jsp pages I have personally worked alot with .net and am really happy with the framework and Visual studio as IDE I find it easy to work with and there is a massive community support behind .net, i can get alot done quickly I have not every written anything use java jsp, there will be a learning curve here , so my experience is limited here. however after seeing jira i am very impressed with its capabilities, it has changed alot since the old days ( java 1.2 ) that i used to work with, and the fact that it runs under linux is a huge plus, so i am trying to decide is the learning curve, worth the price ? so given the situation above what would you recommended? Thanks, Amir

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  • Any competitors to db4o on compact framework?

    - by MrJeepster
    We've been trying db4o for persisting objects on the compact framework. It works very well from our tests so far. However, it appears they are on the expensive side for small startups with minimal units needed. Does anyone know of any similar object databases for the compact framework? How about a open source one that is free for commercial use? :) Thank you. EDIT: We're really looking for an object database. We don't want to create our own persistence framework at this point and would prefer being able to just save/retrieve the actual object trees.

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  • ASP.NET MVC Concurrency with RowVersion in Edit Action

    - by Jorin
    I'm wanting to do a simple edit form for our Issue Tracking app. For simplicity, the HttpGet Edit action looks something like this: // Issues/Edit/12 public ActionResult Edit(int id) { var thisIssue = edmx.Issues.First(i => i.IssueID == id); return View(thisIssue); } and then the HttpPost action looks something like this: [HttpPost] public ActionResult Edit(int id, FormCollection form) { // this is the dumb part where I grab the object before I update it. // concurrency is sidestepped here. var thisIssue = edmx.Issues.Single(c => c.IssueID == id); TryUpdateModel(thisIssue); if (ModelState.IsValid) { edmx.SaveChanges(); TempData["message"] = string.Format("Issue #{0} successfully modified.", id); return RedirectToAction("Index"); } return View(thisIssue); } Which works wonderfully. However, the concurrency check doesn't work because in the Post, I'm re-retreiving the current entity right before I attempt to update it. However, with EF, I don't know how to use the fanciness of SaveChanges() but attach my thisIssue to the context. I tried to call edmx.Issues.Attach(thisIssue) but I get The object cannot be attached because it is already in the object context. An object can only be reattached when it is in an unchanged state. How do I handle concurrency in MVC with EF and/or how do I properly Attach my edited object to the context? Thanks in advance

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  • Question about WinForms TrackBar control in .Net

    - by Jules
    Does anyone know the millisecond interval, used by the framework trackbar, between calling the ValueChanged event when moving the grip with a mouse? I've implemented my own trackbar and I'd like the behaviour to be consistent with what the user expects. I've had a look in reflector but it's one of those controls where most of the implementation is not viewable. ETA: Actually, thinking about it, it's not as simple as that. For small changes, the TrackBar is raising the event for every change. However, if you make a large fast change with the grip, it will not raise the event for every step. Just wondering exactly how the framework does this? Thanks

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  • LINQ to SQL vs Entity Framework for an app with a future SQL Azure version

    - by Craig L
    I've got a vertical market Dot Net Framework 1.1 C#/WinForms/SQL Server 2000 application. Currently it uses ADO.Net and Microsoft's SQLHelper for CRUD operations. I've successfully converted it to Dot Net Framework 4 C#/WinForms/ SQL Server 2008. What I'd like to do is also offer my customers the ability to use SQL Azure as a backend storage for their data instead of local/LAN SQL Server. If I know SQL Azure is in my application's future, should I: A. Switch to LINQ to SQL B. Swith to Entity Framework C. Stick with ADO.Net and SQLHelper Thanks !

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  • Constructing an object and calling a method without assignment in VB.Net

    - by mdryden
    I'm not entirely sure what to call what C# does, so I haven't had any luck searching for the VB.Net equivalent syntax (if it exists, which I suspect it probably doesn't). In c#, you can do this: public void DoSomething() { new MyHelper().DoIt(); // works just fine } But as far as I can tell, in VB.Net, you must assign the helper object to a local variable or you just get a syntax error: Public Sub DoSomething() New MyHelper().DoIt() ' won't compile End Sub Just one of those curiosity things I run into from day to day working on mixed language projects - often there is a VB.Net equivalent which uses less than obvious syntax. Anyone?

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  • Rewriting VB.NET Lambda experession as a C# statement

    - by ChadD
    I downgraded my app from version 4 of the framework to version 4 and now I want to implement this VB.NET lambda function statement (which works on 3.5) Dim colLambda As ColumnItemValueAccessor = Function(rowItem As Object) General_ItemValueAccessor(rowItem, colName) and rewrite it in C#. This was my attempt: ColumnItemValueAccessor colLambda = (object rowItem) => General_ItemValueAccessor(rowItem, colName); When I did this, I get the following error: Error 14 One or more types required to compile a dynamic expression cannot be found. Are you missing references to Microsoft.CSharp.dll and System.Core.dll? C:\Source\DotNet\SqlSmoke\SqlSmoke\UserControls\ScriptUserControl.cs 84 73 SqlSmoke However, when I downgraded the app from version 4.0 of the framework to 3.5 (because our users only hae 3.5 and don't have rights to install 4.0). when I did this, the reference to "Microsoft.CSharp" was broken. Can I rewrite the VB.NET command in C# using syntax that is valid in C# 3.5 as I was able to in VB.NET? What would the syntax be?

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  • asp.net mvc deployment

    - by Casey
    I've been dealing with a legacy asp.net 2.0 web site that was originally setup to deploy everything (source uncompiled) to the target server. I've been looking at doing some major upgrades and want to move to asp.net mvc. I'm coming from mostly a Java background where we typically deploy everything inside of a Web ARchive (war file) and the application server takes it from there. Is there a similar concept in the .net world? Right now in my mvc test app, I just put the compiled code into the deployed bin folder and the rest of the script/view files there as well. From what I have been reading it seems that most use the Publish feature of VS.

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