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• Breaking changes in .NET 4.0

  - by Andrei Taptunov

  There is a lot of information about new features and classes in new 4.0 however there are also changes that may affect esixting applications, for example Timespan now implements IFormattable and old string.Format() with invalid options will throw exception instead of calling simple ToString(). However, CLR team provides a nice feature to enable behaviour from previous version with configuration setting - TimeSpan_LegacyFormatMode . CLR Inside Out Access to events inside the class where they are declared using += or -= will lead to call add/remove generated accessors that return void. Some code wan't even compile in 4.0. Chris Burrows Blog CAS is deprecated and to enable it one still need to use special setting in configuration - NetFx40_LegacySecurityPolicy So I wonder what are other changes and is it possible to find at least preliminary list of changes that will or may break existing functionality with release of .NET 4.0 ?

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• ASP.Net double-click problem

  - by David Archer

  Hi there, having a slight problem with an ASP.net page of mine. If a user were to double click on a "submit" button it will write to the database twice (i.e. carry out the 'onclick' method on the imagebutton twice) How can I make it so that if a user clicks on the imagebutton, just the imagebutton is disabled? I've tried: <asp:ImageButton runat="server" ID="VerifyStepContinue" ImageUrl=image src ToolTip="Go" TabIndex="98" CausesValidation="true" OnClick="methodName" OnClientClick="this.disabled = true;" /> But this OnClientClick property completely stops the page from being submitted! Any help? Sorry, yes, I do have Validation controls... hence the icky problem.

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• Global "ajax call" notification with asp.net mvc/jquery

  - by Joel Martinez

  I need to be notified any time a largeish asp.net mvc web application makes an ajax call to the server. We're using both jquery, and the built-in Ajax.* methods to do the remote calls, and I would like a global way of knowing when we make a call without having to manually inject some sort of "IsMakingCall" method to every request. The root problem we're trying to solve is session timeout. If the user leaves a page up and goes to lunch (for example), they get errors when they get back because the ajax call is returning the login page instead of the expected json or partial html result. My idea was to have a js timer which would be reset any time we make an ajax call. That way, if the timer runs out (ie. their session has now timed out) I can just auto-log them out. This is how sites like bank of america and mint.com work. Thanks!

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• Where to get apache poi port for .net

  - by Nassign

  I would like to know if there is a website where I could download the Apache POI ported for .net? I already found this link in the web http://www.apache.org/~avik/dist/poi-2.5.1-dev-20040708.dll But the version of apache poi now is 3.6, I was wondering if there is a latest version out there? Does the apache foundation support such porting? I already tried to search the apache website too with no avail. As for using Microsoft library, the excel interopt is not that good for concurrent processing like a web backend. If I use the DocumentFormat.OpenXML library, I have a limitation of creating office 2007 document only.

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• ASP.NET MVC View Engine Comparison

  - by McKAMEY

  EDIT: added a community wiki to begin capturing people's experience with various View Engines. Please respectfully add any experiences you've had. I've been searching on SO & Google for a breakdown of the various View Engines available for ASP.NET MVC, but haven't found much more than simple high-level descriptions of what a view engine is. I'm not necessarily looking for "best" or "fastest" but rather some real world comparisons of advantages / disadvantages of the major players (e.g. the default WebFormViewEngine, MvcContrib View Engines, etc.) for various situations. I think this would be really helpful in determining if switching from the default engine would be advantageous for a given project or development group. Has anyone encountered such a comparison?

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• Session state in asp.net mvc

  - by tiff

  I would like to know how to use session state in a simple log in log out in asp.net mvc.. I have a code here in my controller that I've retrieved from my mysql database for my session log in..but I don't really know how to manipulate it.. <AcceptVerbs(HttpVerbs.Post)> _ Function Index(ByVal username As String, ByVal password As String, ByVal department As String) As ActionResult Dim user As DataTable user = Account.userSelect(username:=username, password:=password, department:=department) If user.Rows.Count = 0 Then Return RedirectToAction("Index", "Home") Else Session("username") = user.Rows(0).Item("username") Session("department") = user.Rows(0).Item("department") Return RedirectToAction("News", "Administration") End If End Function Thank you!

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• Methods of providing custom reports for an asp.net application

  - by Jarrod

  In our windows application, we used crystal reports. If a customer needed a custom report, we could create it and then send them the rpt file. The customer would then simply add the report file to a custom folder, and could access it directly from our application. Using a web app, how is this possible. It seems like anything created, using ssrs, crystal, or even telerik reporting must be embedded. What are some methods for providing custom reports to users of an asp.net web application?

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• ASP.NET / WCF - Execute Server.Execute Asynchronously

  - by user208662

  Hello, I need to run the HttpContext.Current.Server.Execute method in my ASP.NET application. This application has a WCF operation that does some processing. Currently, I am to do my processing correctly from within my WCF operation. However, I would like to do this asynchronously. In an error to attempt this asynchronously, I tried running Server.Execute in the DoWork event handler of a BackgroundWorker. Unfortunately, this throws an error that says "object reference not set to an instance of an object" The HttpContext element is not null. I checked that. It is some property nested in the HttpContext object that appears to be null. However, I have not been able to identify why this won't work. It happens as soon as I move the processing to the BackgroundWorker thread. My question is, how can I asynchronously execute the Server.Execute method? Thank you,

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• Problem sending mail with simple .net application. Server refusal error.

  - by Fatih

  I have a very simple .net application for testing SMTP on .net. But i am receiving this weird error. "System.Net.Mail.SmtpException: Failure sending mail. --- System.Net.WebException: Unable to connect to the remote server --- System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it" SMTP server is remote and doesn't need any kind of authentication so i don't need credentials. But i can send mails from this computer with outlook using same smtp server and same smtp settings without any problem. Any ideas? It will be appreciated so much. Imports System.Net.Mail Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim smtp As New SmtpClient smtp.Host = "10.241.128.220" smtp.Port = 25 smtp.Send("[email protected]", "[email protected]", "test", "test") End Sub

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• Generic HTTP Handler in ASP.Net

  - by Bruno Brant

  Hello all, I want to write a custom HTTP Handler in ASP.Net (I'm using C# currently) that filters all requests to, say, .aspx files, and then, depending on the page name that comes with the requests, I redirect the user to a page. So far, I've written a handler that filter "*", that is, everything. Let's say I receive a request for "Page.aspx", and want to send the user to "AnotherPage.aspx". So I call Redirect on that response and pass "AnotherPage.aspx" as the new page. The problem is that this will once more trigger my handler, which will do nothing. This will leave the user without any response. So, is there a way to send the request to the other handlers (cascade the message) once I've dealt with it? Thanks, Bruno

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• Which version of Windows 7 for .NET Developers

  - by Dkong

  Hi, I'm looking to upgrade my laptop from Windows Vista to Windows 7. As a .NET developer I'm not interested in developing Windows 7 components at this stage, but was curious which version would suffice to Install Visual Studio/SQL Server and do some web development testing against the local instance of IIS. I don't care too much about the superfluous features of any Windows 7 editions, I just need to know which one will keep me right for running apps and writing some code. Also, does Windows 7 force the "run as administrator" against VS? Any recommendations?

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• Does Google index HTTPS ASP.NET pages?

  - by ncakmak

  I have an online application that all of its pages use HTTPS. I have 3 questions: Does Google index HTTPS pages? I have a password protected single ASP.NET page (using HTTPS). Password protection is basically achieved by a Session object. When the correct password is entered, it hides the login panel and displays the same page which has a sensitive data. Is this page indexed by Google? I have a Secure folder that I implemented Forms Authentication. All pages in folder use HTTPS as well. Are the pages in this folder indexed by Google? Thank you for your help, Niyazi

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• ASP.NET MVC Web structure

  - by ile

  This is database structure. It is used to build simple cms in asp.net mvc. Before I run deeper into developing site, I want to make sure if this would be "correct" web structure: Articles: Controllers folder: Create controllers ArticleCategoryController and ArticleController Models folder: ArticleCategoryRepository and ArticleRepository View folder: ArticleCategory folder (Create.aspx, Edit.aspx, Index.aspx, Details.aspx); Article folder (Create.aspx, Edit.aspx, Index.aspx, Details.aspx) Photos: Controllers folder: Create controllers PhotoAlbumController and PhotoController Models folder: PhotoAlbumRepository and PhotoRepository View folder: PhotoAlbum folder (Create.aspx, Edit.aspx, Index.aspx, Details.aspx); Photo folder (Create.aspx, Edit.aspx, Index.aspx, Details.aspx) and so on... Is there a better way or this is ok? Thanks. Ile

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• Membership provider stopped working on using Membership Provider in ASP.Net MVC

  - by Michael Meadows

  I have a production ASP.Net MVC application that has been using the membership service. It has worked fine, up until today. Nothing has changed on the server, but I now have this error: System.Configuration.Provider.ProviderException: The 'System.Web.Security.SqlMembershipProvider' requires a database schema compatible with schema version '1'. However, the current database schema is not compatible with this version. You may need to either install a compatible schema with aspnet_regsql.exe (available in the framework installation directory), or upgrade the provider to a newer version. I checked the asp_schemaversions table, and it looks fine. Please any help would be appreciated.

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• File Upload multiple files in asp.net (similar to gmail)

  - by superstar

  Hi Guys, I need suggestions with regards to the multiple file upload using File Upload control in asp.net(along with C#). I have a File Upload Control, so i click the 'Browse' button and when i select a file from the select file dialog, i want the file to be shown as a link below the File Upload Control( somewhat similar to gmail). This file should be seen such a way that it can be deleted, if i wanted to. And also i should be able to upload another file from the File Upload control. All these files should be uploaded to a location when i use a button click event in the end. I think i have made myself clear. Any Suggestions are really helpful. Thanks.

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• SSL Form Post in ASP.NET MVC 1.0

  - by goombaloon

  I'd like to use SSL for the post action on the login page of my MVC 1.0 app. I've seen some articles related to the [RequireSSL] attribute in ASP.NET MVC Futures. However, since this works using a redirect, I assume it's not an option (can't redirect a POST, correct?). Ultimately, my goal is to get the Html.BeginForm method to render "https://..." as the form's action so that I can secure the information being posted (login info). How have others handled this?

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• A definitive guide to Url Encoding in ASP .NET

  - by cbp

  I am starting to realise that there are about a bazillion different methods for encoding urls in .NET. I keep finding new ones. They all work slightly differently, but they all have essentially the same summary comments. Does anyone have a definitive matrix that shows the exact differences between the following methods: HttpUtility.UrlEncode HttpUtility.UrlPathEncode Server.UrlEncode Uri.EscapeUriString Uri.EscapeDataString ... are they any more? Also it would be good to match these up with use-cases e.g.: Urls in href attributes of a tags Urls to be displayed to the user in HTML Urls as querystring values (i.e. to be sent in GET requests) Urls to be sent in POST requests etc

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• How to style alternating rows in asp.net mvc

  - by YeahStu

  I am using a <% foreach ...% loop to list a collection of items on my website. I want to add a different background color for the style of alternating rows in my list. I have found a way to do this but I am not satisfied with it as it seems like a hack. Here is what I have done to solve it so far: <table> <% int counter = 0; foreach (var item in Model) { counter++; if (counter % 2 == 0) { %> <tr class="colorfull"> <% } else { %> <tr> <% } %> ... Is there a best practice that I am missing that people are using for this scenario in ASP.NET MVC?

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• Security for ASP.NET application running on intranet / VPN

  - by Ryan

  Hi, I have an ASP.NET app that sits on our intranet, using the WindowsIdentity to identify the user: WindowsIdentity wi = HttpContext.Current.User.Identity as WindowsIdentity; if (wi == null || wi.Name == null) { noAccess("No WindowsIdentity"); return; } string username = wi.Name; if (username.Contains("\\")) username = username.Substring(username.LastIndexOf("\\") + 1); This works fine on our Intranet. However, when users from other offices (separate network, with firewall open) they get a password request input box. Why are they getting the password dialogue? What is the recommended way identify users of the app? I want to avoid using password, but windows identities. Anyone attempting to access the application is inside a trusted network. Thanks a lot for any help Ryan

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• Problem with Ajax Toolkit ASP.NET (Visual Basic)

  - by AZIRAR

  Hey, I'm trying to use Ajax Toolkit in ASP.NET page to display a Calendar Extender with this code, but it's not working for me. <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <div> <br /> <br /> <b>Calendar :</b><br /> <asp:TextBox ID="Date1" runat="server"></asp:TextBox> <asp:CalendarExtender ID="CalendarExtender1" runat="server" TargetControlID="Date1"> </asp:CalendarExtender> </div> </form> It's not displaying the calendar. What's the problem ?

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• ASP.NET FormsAuthentication Cookie Problem

  - by Niels Bosma

  We use FormAuthentication to manage logins and I have a case where a customer complains where he can login from one computer but to from another. I can see in my logs that his authentican is successfull but he gets bumped back to the login page. I can reproduce the symptons by disabling cookies so I asked the customer to test if cookies are enabled on http://www.tempesttech.com/cookies/cookietest1.asp, but this came out positive. What have I missed? Is there any antivirus/security software that can mess up (ASP.NET) cookies? The user is using IE7 and claims to have F-secure installed.

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• ASP.NET plugin architecture for SaaS?

  - by chopps

  Hey Everyone, Been doing a bit of research and have a few questions about using a Plugin architecture for asp.net. I have used it before for a single application and works well but was wondering if it technically possible to use this architecture for a SaaS? Once code base but custom plugins for each customer using some form of custom folders to organize the plugins? Idea would be to use one main code base instead of having to maintain code for N number of clients. Ideas? Thoughts? Experience either way?

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• Calling generic method in spring.net application context

  - by Bert Vandamme

  Hi, I'm trying to invoke this method in spring.net, but i'm having trouble getting the configuration right. Method: public void AddRepository(IRepository repository) where TEntity : IEntity { Repositories.Add(repository.GetType().Name, repository); } Config: <object type="Spring.Objects.Factory.Config.MethodInvokingFactoryObject, Spring.Core"> <property name="TargetObject"> <ref local="RepositoryFactory" /> </property> <property name="TargetMethod" value="AddRepository"/> <property name="Arguments"> <list> <ref object="BinaryAssetFileRepository"/> </list> </property> </object>" Is it possible to address generic methods in this way? Thx, Bert

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• Developing ASP.NET MVC UI Extensions - best approach

  - by user252160

  What are the best practices in developing rich UI extensions for ASP.NET MVC (I mean asynchronous / partial loading, slick effects, skinning etc) ? I saw that Telerik has an MVC suite of extensions, but haven't tried them yet, so I cannot comment on them. My biggest concern as of the moment is how to structure the code of my extensions so that C#, ASP markup, and JQuery remain separate from each other, yet encapsulated in a way that the extension must be easy to distribute and reuse. I know that the user control approach had many flaws, yet it sort of allowed application developers to just reference a control, set some parameters and get it going in a few minutes. I'd like to achieve the same kind of portability/reusability as I still keep the code easy to extend and build upon. Now, some ideas that come to mind as topics for discussion are: template helpers vs. extension method helpers or a possible integration efficient use of jQuery - naming conventions - - asynchronous action loading - etc you can add whatever comes to your mind

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• Creating a new record using AJAX in ASP.NET-MVC

  - by RememberME

  I am having the hardest time wrapping my head around this. I recently asked this question Create/Edit/Save data in a jQuery pop-up for ASP.NET-MVC and Linq2Sql I'm sure that the response is the right way to go, but I just can't figure out how to write the back-end code to make it work. I originally made my site by following the nerddinner tutorial. I have a subcontracts model and a subcontracts controller. On my subcontract entry page, I'd like for there to be a pop-up/dialog box where the user can enter a new company if the company isn't already in the drop-down list. Do I need to create a new company controller? I wouldn't have a company model b/c the company table is linked to my subcontracts table within the subcontracts dbml. Can anyone point me to an example somewhere? Or offer any help.

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