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• ASP.NET 4.0 Features

  ASP.NET v4 is released with Visual studio 2010. Web developers are presented with a bewildering range of new features and so Ludmal De Silva has described what he considers to be the most important new features in ASP.NET V4

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• AJAX basics with jQuery in ASP.NET

  ASP.NET now has support for the jQuery JavaScript library. Although ASP.NET integrated AJAX technology by introducing the is the UpdatePanel server control, jQuery offers an alternative, and more versatile, way of doing it and a great deal more besides. Matteo shows how easy it is to get started with using jQuery.

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• How to Deploy an ASP.NET Web API- and Browser-based Application to a Production Environment [closed]

  - by lmttag

  Possible Duplicate: How to Deploy an ASP.NET Web API- and Browser-based Application to a Production Environment We have an ASP.NET Web API server that serves up a SQL Server data driven website. The API uses JSON to transfer data from SQL Server to the front end. We need to move it to an internal production environment (nothing will be exposed on the public Internet) and we’re having problems - or just not understanding what needs to be done. There are two domains: The corporate domain - where all users login normally. The process domain - contains the database the Web API needs to access. The IT staff wants to put a DMZ between the two domains to house the IIS app and shield the users on the corporate domain from having access into the process domain directly. The ideal configuration is: corp domain (end users) <–> firewall (open port 80) <–> DMZ (web server running IIS) <–> firewall (open port 80 or 1433????) <–> process domain (IIS for Web API and SQL Server) We don’t really understand how to deploy our browser/Web API application in this scenario. Do we need to break up our application so that all the client code is on the IIS server in the DMZ, while the Web API gets installed on the server in the process domain? Does the entire app (client code and Web API) stay together on the IIS server in the DMZ, which then somehow accesses the SQL Server instance to get data? From the IIS server and app in the DMZ, would you simply access the Web API on the server in the process domain by going to http://server/appname/api/getitmes? In the second firewall between the DMZ and the process domain, would you have to open port 1433 or just port 80 since the Web API is a HTTP endpoint? Or, is there some better way of deployment (i.e., how ASP.NET Web API single page applications written all in HTML5 and JavaScript supposed to be deployed to production environments?)? NB: The servers are Win2k8 R2, SQL Server 2k8 R2, and IIS 7.5.

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• Edit problem on asp.net mvc

  - by ognjenb

  <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<IEnumerable<MvcKVteam.Models.transporter>>" %> <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> Transporters </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h2>Transporters</h2> <table class="data-table" id=""> <tr> <th> Id </th> <th> ContactId </th> <th> Name </th> <th> Notes </th> <th> PreferredCurrency </th> <th> PriceList </th> <th> SeviceTypeAvailible </th> <th> Contact </th> </tr> <% foreach (var item in Model) { %> <tr> <td> <%= Html.Encode(item.Id) %> </td> <td> <%= Html.Encode(item.ContactId) %> </td> <td> <%= Html.Encode(item.Name) %> </td> <td> <%= Html.Encode(item.Notes) %> </td> <td> <%= Html.Encode(item.PreferredCurrency) %> </td> <td> <%= Html.Encode(item.PriceList) %> </td> <td> <%= Html.Encode(item.SeviceTypeAvailible) %> </td> <td> <%= Html.ActionLink("View contact info", "Edit", new { id = item.ContactId }) %> </td> </tr> <% } %> </table> <p> <%= Html.ActionLink("Create New", "Create") %> </p> This action for Edit: public ActionResult Edit(int id) { var FilesQuery1 = from i in FilesEntities.contact where i.Id == id select i; return View(FilesQuery1); } When click on "View contact info" link I have this error: The model item passed into the dictionary is of type 'System.Data.Objects.ObjectQuery`1[MvcKVteam.Models.contact]', but this dictionary requires a model item of type 'MvcKVteam.Models.contact'.

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• ASP.NET MVC 3: Razor’s @: and <text> syntax

  - by ScottGu

  This is another in a series of posts I’m doing that cover some of the new ASP.NET MVC 3 features: New @model keyword in Razor (Oct 19th) Layouts with Razor (Oct 22nd) Server-Side Comments with Razor (Nov 12th) Razor’s @: and <text> syntax (today) In today’s post I’m going to discuss two useful syntactical features of the new Razor view-engine – the @: and <text> syntax support. Fluid Coding with Razor ASP.NET MVC 3 ships with a new view-engine option called “Razor” (in addition to the existing .aspx view engine).  You can learn more about Razor, why we are introducing it, and the syntax it supports from my Introducing Razor blog post.  Razor minimizes the number of characters and keystrokes required when writing a view template, and enables a fast, fluid coding workflow. Unlike most template syntaxes, you do not need to interrupt your coding to explicitly denote the start and end of server blocks within your HTML. The Razor parser is smart enough to infer this from your code. This enables a compact and expressive syntax which is clean, fast and fun to type. For example, the Razor snippet below can be used to iterate a list of products: When run, it generates output like:   One of the techniques that Razor uses to implicitly identify when a code block ends is to look for tag/element content to denote the beginning of a content region.  For example, in the code snippet above Razor automatically treated the inner <li></li> block within our foreach loop as an HTML content block because it saw the opening <li> tag sequence and knew that it couldn’t be valid C#.  This particular technique – using tags to identify content blocks within code – is one of the key ingredients that makes Razor so clean and productive with scenarios involving HTML creation. Using @: to explicitly indicate the start of content Not all content container blocks start with a tag element tag, though, and there are scenarios where the Razor parser can’t implicitly detect a content block. Razor addresses this by enabling you to explicitly indicate the beginning of a line of content by using the @: character sequence within a code block.  The @: sequence indicates that the line of content that follows should be treated as a content block: As a more practical example, the below snippet demonstrates how we could output a “(Out of Stock!)” message next to our product name if the product is out of stock: Because I am not wrapping the (Out of Stock!) message in an HTML tag element, Razor can’t implicitly determine that the content within the @if block is the start of a content block.  We are using the @: character sequence to explicitly indicate that this line within our code block should be treated as content. Using Code Nuggets within @: content blocks In addition to outputting static content, you can also have code nuggets embedded within a content block that is initiated using a @: character sequence.  For example, we have two @: sequences in the code snippet below: Notice how within the second @: sequence we are emitting the number of units left within the content block (e.g. - “(Only 3 left!”). We are doing this by embedding a @p.UnitsInStock code nugget within the line of content. Multiple Lines of Content Razor makes it easy to have multiple lines of content wrapped in an HTML element.  For example, below the inner content of our @if container is wrapped in an HTML <p> element – which will cause Razor to treat it as content: For scenarios where the multiple lines of content are not wrapped by an outer HTML element, you can use multiple @: sequences: Alternatively, Razor also allows you to use a <text> element to explicitly identify content: The <text> tag is an element that is treated specially by Razor. It causes Razor to interpret the inner contents of the <text> block as content, and to not render the containing <text> tag element (meaning only the inner contents of the <text> element will be rendered – the tag itself will not).  This makes it convenient when you want to render multi-line content blocks that are not wrapped by an HTML element.  The <text> element can also optionally be used to denote single-lines of content, if you prefer it to the more concise @: sequence: The above code will render the same output as the @: version we looked at earlier.  Razor will automatically omit the <text> wrapping element from the output and just render the content within it.  Summary Razor enables a clean and concise templating syntax that enables a very fluid coding workflow.  Razor’s smart detection of <tag> elements to identify the beginning of content regions is one of the reasons that the Razor approach works so well with HTML generation scenarios, and it enables you to avoid having to explicitly mark the beginning/ending of content regions in about 95% of if/else and foreach scenarios. Razor’s @: and <text> syntax can then be used for scenarios where you want to avoid using an HTML element within a code container block, and need to more explicitly denote a content region. Hope this helps, Scott P.S. In addition to blogging, I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu

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• ASP.NET, HTTP 404 and SEO

  - by paxer

  The other day our SEO Manager told me that he is not happy about the way ASP.NET application return HTTP response codes for Page Not Found (404) situation. I've started research and found interesting things, which could probably help others in similar situation.  1) By default ASP.NET application handle 404 error by using next web.config settings           <customErrors defaultRedirect="GenericError.htm" mode="On">             <error statusCode="404" redirect="404.html"/>           </customErrors> However this approach has a problem, and this is actually what our SEO manager was talking about. This is what HTTP return to request in case of Page not Found situation. So first of all it return HTTP 302 Redirect code and then HTTP 200 - ok code. The problem : We need to have HTTP 404 response code at the end of response for SEO purposes.  Solution 1 Let's change a bit our web.config settings to handle 404 error not on static html page but on .aspx page      <customErrors defaultRedirect="GenericError.htm" mode="On">             <error statusCode="404" redirect="404.aspx"/>           </customErrors> And now let's add in Page_Load event on 404.aspx page next lines     protected void Page_Load(object sender, EventArgs e)             {                 Response.StatusCode = 404;             } Now let's run our test again Now it has got better, last HTTP response code is 404, but my SEO manager still was not happy, becouse we still have 302 code before it, and as he said this is bad for Google search optimization. So we need to have only 404 HTTP code alone. Solution 2 Let's comment our web.config settings     <!--<customErrors defaultRedirect="GenericError.htm" mode="On">             <error statusCode="404" redirect="404.html"/>           </customErrors>--> Now, let's open our Global.asax file, or if it does not exist in your project - add it. Then we need to add next logic which will detect if server error code is 404 (Page not found) then handle it.       protected void Application_Error(object sender, EventArgs e)             {                            Exception ex = Server.GetLastError();                 if (ex is HttpException)                 {                     if (((HttpException)(ex)).GetHttpCode() == 404)                         Server.Transfer("~/404.html");                 }                 // Code that runs when an unhandled error occurs                 Server.Transfer("~/GenericError.htm");                  } Cool, now let's start our test again... Yehaa, looks like now we have only 404 HTTP response code, SEO manager and Google are happy and so do i:) Hope this helps!  

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• Posting from ASP.NET WebForms page to another URL

  - by hajan

  Few days ago I had a case when I needed to make FORM POST from my ASP.NET WebForms page to an external site URL. More specifically, I was working on implementing Simple Payment System (like Amazon, PayPal, MoneyBookers). The operator asks to make FORM POST request to a given URL in their website, sending parameters together with the post which are computed on my application level (access keys, secret keys, signature, return-URL… etc). So, since we are not allowed nesting another form inside the <form runat=”server”> … </form>, which is required because other controls in my ASPX code work on server-side, I thought to inject the HTML and create FORM with method=”POST”. After making some proof of concept and testing some scenarios, I’ve concluded that I can do this very fast in two ways: Using jQuery to create form on fly with the needed parameters and make submit() Using HttpContext.Current.Response.Write to write the form on server-side (code-behind) and embed JavaScript code that will do the post Both ways seemed fine. 1. Using jQuery to create FORM html code and Submit it. Let’s say we have ‘PAY NOW’ button in our ASPX code: <asp:Button ID="btnPayNow" runat="server" Text="Pay Now" /> Now, if we want to make this button submit a FORM using POST method to another website, the jQuery way should be as follows: <script src="http://ajax.aspnetcdn.com/ajax/jquery/jquery-1.5.1.js" type="text/javascript"></script> <script type="text/javascript">     $(function () {         $("#btnPayNow").click(function (event) {             event.preventDefault();             //construct htmlForm string             var htmlForm = "<form id='myform' method='POST' action='http://www.microsoft.com'>" +                 "<input type='hidden' id='name' value='hajan' />" +             "</form>";             //Submit the form             $(htmlForm).appendTo("body").submit();         });     }); </script> Yes, as you see, the code fires on btnPayNow click. It removes the default button behavior, then creates htmlForm string. After that using jQuery we append the form to the body and submit it. Inside the form, you can see I have set the htttp://www.microsoft.com URL, so after clicking the button you should be automatically redirected to the Microsoft website (just for test, of course for Payment I’m using Operator's URL). 2. Using HttpContext.Current.Response.Write to write the form on server-side (code-behind) and embed JavaScript code that will do the post The C# code behind should be something like this: public void btnPayNow_Click(object sender, EventArgs e) {     string Url = "http://www.microsoft.com";     string formId = "myForm1";     StringBuilder htmlForm = new StringBuilder();     htmlForm.AppendLine("<html>");     htmlForm.AppendLine(String.Format("<body onload='document.forms[\"{0}\"].submit()'>",formId));     htmlForm.AppendLine(String.Format("<form id='{0}' method='POST' action='{1}'>", formId, Url));     htmlForm.AppendLine("<input type='hidden' id='name' value='hajan' />");     htmlForm.AppendLine("</form>");     htmlForm.AppendLine("</body>");     htmlForm.AppendLine("</html>");     HttpContext.Current.Response.Clear();     HttpContext.Current.Response.Write(htmlForm.ToString());     HttpContext.Current.Response.End();             } So, with this code we create htmlForm string using StringBuilder class and then just write the html to the page using HttpContext.Current.Response.Write. The interesting part here is that we submit the form using JavaScript code: document.forms["myForm1"].submit() This code runs on body load event, which means once the body is loaded the form is automatically submitted. Note: In order to test both solutions, create two applications on your web server and post the form from first to the second website, then get the values in the second website using Request.Form[“input-field-id”] I hope this was useful post for you. Regards, Hajan

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• ASP.Net performance counters

  - by nikolaosk

  I was involved in designing and implementing an ASP.Net application some time ago. After we deployed the application we wanted to monitor various aspects of the application. We can use the Performance Monitor. In my windows Server 2008 machine, I go to Start-Run and type " perfmon " and the Performance monitor window pops up. There are thousands of counters in there and it is impossible for anyone to know them all. Most people I know use the Performance Monitor to add counters to monitor SQL Server...(read more)

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• Quick ways to boost performance and scalability of ASP.NET, WCF and Desktop Clients

  - by oazabir

  There are some simple configuration changes that you can make on machine.config and IIS to give your web applications significant performance boost. These are simple harmless changes but makes a lot of difference in terms of scalability. By tweaking system.net changes, you can increase the number of parallel calls that can be made from the services hosted on your servers as well as on desktop computers and thus increase scalability. By changing WCF throttling config you can increase number of simultaneous calls WCF can accept and thus make most use of your hardware power. By changing ASP.NET process model, you can increase number of concurrent requests that can be served by your website. And finally by turning on IIS caching and dynamic compression, you can dramatically increase the page download speed on browsers and and overall responsiveness of your applications. Read the CodeProject article for more details. http://www.codeproject.com/KB/webservices/quickwins.aspx Please vote for me if you find the article useful.

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• Displaying XML data using XSLT transformations in an ASP.Net site

  - by nikolaosk

  In this post, I will try to show you how to display xml data in asp.net website after making some xslt transformations. You will need to know a few things about XSLT. The best place to find out about XSLT is this link . I am going to explain a few things about XSLT elements and functions in this post, anyway. You will see the namespaces we are going to use and some of the main classes and methods.All these come with the FCL (Framework class library) and we just have to know what they do. We will...(read more)

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• How to access HTML elements from server side code in an asp.net website

  - by nikolaosk

  In this post I will demonstrate with a hands on example how HTML elements in an .aspx page can be processed exactly like standard ASP.Net server controls. Basically how to make them accessible from server side code. 1) Launch Visual Studio 2010/2008/2005. (express editions will work fine). Create a new empty website and choose a suitable name for it. Choose VB as the development language. 2) Add a new item in your site, a web form. Leave the default name. 3) Let's say that we want to change the background...(read more)

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• ASP.Net 4.0 and tableless menu control

  - by nikolaosk

  One of the issues I really like to read and learn is client side technologies. I am an ASP.Net guy at heart but I find CSS particular useful and I have been blogging about CSS in my other blog. Have a look here if you want for some interesting posts on CSS I believe designing web applications and sites according to web standards. I do not think designing our websites with tables is correct. Tables should be used for what they are good at doing, Display tabular data . So if we are in charge of our...(read more)

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• Linq to SQL Lazy Loading in ASP.Net applications

  - by nikolaosk

  In this post I would like to talk about LINQ to SQL and its native lazy loading functionality. I will show you how you can change this behavior. We will create a simple ASP.Net application to demonstrate this. I have seen a lot of people struggling with performance issues. That is mostly due to the lack of knowledge of how LINQ internally works.Imagine that we have two tables Products and Suppliers (Northwind database). There is one to many relationship between those tables-entities. One supplier...(read more)

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• The Image ASP.Net web server control

  - by nikolaosk

  In this post I will try to show you how to use the ImageMap web server control. This is going to be a very easy example. We will write no code but I will use the control to create navigation hotspots. 1) Launch Visual Studio 2010/2005/2008. Express editions will be fine. 2) Create a new asp.net empty web site and call it “ NavigationHotspot ”. 3) Drag and drop in the default.aspx page a ImageMap web server control from the Toolbox. 4) Let me explain what I did. I have an image that contains two flags...(read more)

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• Membership in ASP.Net applications - part 2

  - by nikolaosk

  This is the second post in a series of posts regarding ASP.Net built in membership functionality,providers,controls. You can read the first one post one here . In order to follow this post, complete the steps in the first post. It will only take 10 minutes or so. 1) Launch Visual Studio 2005,2008/2010. Express editions will work fine. I am using Visual Studio 2010 Ultimate edition. 2) Follow all the steps in the first post of the series. 3) Run your application to make sure it runs. 4) Change the...(read more)

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• How to create selectable themes in your ASP.Net applications

  - by nikolaosk

  In this post I am going to show you something that we see in most websites. When we visit a website we are given the choice through a control to select the theme(colors,font size,font family) that we want to be applied to the site. In almost all asp.net web sites we define the look and feel of the site through Themes , skins , Master Pages and Stylesheets . I assume that you know a little bit about CSS,XHTML. I assume that you have little knowledge of web forms and master pages. Before you go on...(read more)

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• How To Get Web Site Thumbnail Image In ASP.NET

  - by SAMIR BHOGAYTA

  Overview One very common requirement of many web applications is to display a thumbnail image of a web site. A typical example is to provide a link to a dynamic website displaying its current thumbnail image, or displaying images of websites with their links as a result of search (I love to see it on Google). Microsoft .NET Framework 2.0 makes it quite easier to do it in a ASP.NET application. Background In order to generate image of a web page, first we need to load the web page to get their html code, and then this html needs to be rendered in a web browser. After that, a screen shot can be taken easily. I think there is no easier way to do this. Before .NET framework 2.0 it was quite difficult to use a web browser in C# or VB.NET because we either have to use COM+ interoperability or third party controls which becomes headache later. WebBrowser control in .NET framework 2.0 In .NET framework 2.0 we have a new Windows Forms WebBrowser control which is a wrapper around old shwdoc.dll. All you really need to do is to drop a WebBrowser control from your Toolbox on your form in .NET framework 2.0. If you have not used WebBrowser control yet, it's quite easy to use and very consistent with other Windows Forms controls. Some important methods of WebBrowser control are. public bool GoBack(); public bool GoForward(); public void GoHome(); public void GoSearch(); public void Navigate(Uri url); public void DrawToBitmap(Bitmap bitmap, Rectangle targetBounds); These methods are self explanatory with their names like Navigate function which redirects browser to provided URL. It also has a number of useful overloads. The DrawToBitmap (inherited from Control) draws the current image of WebBrowser to the provided bitmap. Using WebBrowser control in ASP.NET 2.0 The Solution Let's start to implement the solution which we discussed above. First we will define a static method to get the web site thumbnail image. public static Bitmap GetWebSiteThumbnail(string Url, int BrowserWidth, int BrowserHeight, int ThumbnailWidth, int ThumbnailHeight) { WebsiteThumbnailImage thumbnailGenerator = new WebsiteThumbnailImage(Url, BrowserWidth, BrowserHeight, ThumbnailWidth, ThumbnailHeight); return thumbnailGenerator.GenerateWebSiteThumbnailImage(); } The WebsiteThumbnailImage class will have a public method named GenerateWebSiteThumbnailImage which will generate the website thumbnail image in a separate STA thread and wait for the thread to exit. In this case, I decided to Join method of Thread class to block the initial calling thread until the bitmap is actually available, and then return the generated web site thumbnail. public Bitmap GenerateWebSiteThumbnailImage() { Thread m_thread = new Thread(new ThreadStart(_GenerateWebSiteThumbnailImage)); m_thread.SetApartmentState(ApartmentState.STA); m_thread.Start(); m_thread.Join(); return m_Bitmap; } The _GenerateWebSiteThumbnailImage will create a WebBrowser control object and navigate to the provided Url. We also register for the DocumentCompleted event of the web browser control to take screen shot of the web page. To pass the flow to the other controls we need to perform a method call to Application.DoEvents(); and wait for the completion of the navigation until the browser state changes to Complete in a loop. private void _GenerateWebSiteThumbnailImage() { WebBrowser m_WebBrowser = new WebBrowser(); m_WebBrowser.ScrollBarsEnabled = false; m_WebBrowser.Navigate(m_Url); m_WebBrowser.DocumentCompleted += new WebBrowserDocument CompletedEventHandler(WebBrowser_DocumentCompleted); while (m_WebBrowser.ReadyState != WebBrowserReadyState.Complete) Application.DoEvents(); m_WebBrowser.Dispose(); } The DocumentCompleted event will be fired when the navigation is completed and the browser is ready for screen shot. We will get screen shot using DrawToBitmap method as described previously which will return the bitmap of the web browser. Then the thumbnail image is generated using GetThumbnailImage method of Bitmap class passing it the required thumbnail image width and height. private void WebBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) { WebBrowser m_WebBrowser = (WebBrowser)sender; m_WebBrowser.ClientSize = new Size(this.m_BrowserWidth, this.m_BrowserHeight); m_WebBrowser.ScrollBarsEnabled = false; m_Bitmap = new Bitmap(m_WebBrowser.Bounds.Width, m_WebBrowser.Bounds.Height); m_WebBrowser.BringToFront(); m_WebBrowser.DrawToBitmap(m_Bitmap, m_WebBrowser.Bounds); m_Bitmap = (Bitmap)m_Bitmap.GetThumbnailImage(m_ThumbnailWidth, m_ThumbnailHeight, null, IntPtr.Zero); } One more example here : http://www.codeproject.com/KB/aspnet/Website_URL_Screenshot.aspx

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• Using Custom Validation with LINQ to SQL in an ASP.Net application

  - by nikolaosk

  A friend of mine is working in an ASP.Net application and using SQL Server as the backend. He also uses LINQ to SQL as his data access layer technology. I know that Entity framework is Microsoft's main data access technology. All the money and resources are available for the evolution of Entity Framework. If you want to read some interesting links regarding LINQ to SQL roadmap and future have a look at the following links. http://blogs.msdn.com/b/adonet/archive/2008/10/29/update-on-linq-to-sql-and...(read more)

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• Dynamic URL of asp.net web service with web reference

  - by Jalpesh P. Vadgama

  It’s been a while I am writing this. But never late.. So I am writing this. Before some time one of friend asked about the URL of web service when we add reference. So I am writing this. Some of you may find this very basic but still many of people does not know this that’s why I am writing this. In today’s world we have so many servers like development, preproduction and production etc. and for all the server location or URL of web service will be different.But with asp.net when you add a web reference to your web application it’s create a web reference settings in web.config where you can change this path. So it’s very easy to just change that path and you don’t have to add web reference again. Read More

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• How to profile LINQ to Entities queries in your asp.net applications - part 1

  - by nikolaosk

  I have been teaching ASP.Net and EF in one of my classes and I have been asked on the various ways we can profile database activity. Everyone that I know that uses EF as its data access layer has the same question. "How can I see the T-SQL code that the LINQ to Entities engine generates on the fly?" I know a lot of people use VS studio built-in visualisers but that is not enough. A lot of developers use SQL Server Profiler. That is also a good solution since we can see the queries(generated from...(read more)

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• How to profile LINQ to Entities queries in your asp.net applications - part 2

  - by nikolaosk

  In this post I will continue exploring ways on how to profile database activity when using the Entity Framework as the data access layer in our applications. I will use a simple asp.net web site and EF to demonstrate this. If you want to read the first post of the series click here . In this post I will use the Tracing Provider Wrappers which extend the Entity framework. You can download the whole solutions/samples project from here .The providers were developed from Jaroslaw Kowalski . 1) Unzip...(read more)

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• Uploading Files Using ASP.NET Web Forms, Generic Handler and jQuery

  - by bipinjoshi

  In order to upload files from the client machine to the server ASP.NET developers use FileUpload server control. The FileUpload server control essentially renders an INPUT element with its type set to file and allows you to select one or more files. The actual upload operation is performed only when the form is posted to the server. Instead of making a full page postback you can use jQuery to make an Ajax call to the server and POST the selected files to a generic handler (.ashx). The generic handler can then save the files to a specified folder. The remainder of this post shows how this can be accomplished.http://www.bipinjoshi.net/articles/f2a2f1ee-e18a-416b-893e-883c800f83f4.aspx      

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• Crystal Reports Images not loading in ASP.NET MVC

  - by Ryan Shripat

  I'm using Crystal Reports in a Webform inside of an MVC application. Images in the reports are not being displayed, however, on both the ASP.NET Development Server and IIS 7 (on Win7x64). I know from a number of other questions similar to this that the CrystalImageHandler HTTP Handler is responsible for rendering the image, but I've tried all of the usual solutions to no avail. So far, I have Added the following to my appSettings (via http://www.mail-archive.com/[email protected]/msg26882.html) <add key="CrystalImageCleaner-AutoStart" value="true" /> <add key="CrystalImageCleaner-Sleep" value="60000" /> <add key="CrystalImageCleaner-Age" value="120000" /> Added the following httpHandler to system.web/httpHandlers (via http://stackoverflow.com/questions/2253682/crystal-report-viewer-control-isnt-loading-the-images-inside-the-report) <add verb="GET" path="CrystalImageHandler.aspx" type="CrystalDecisions.Web.CrystalImageHandler, CrystalDecisions.Web, Version=12.0.2000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/> Added the following to my Global.asax.cs (via http://stackoverflow.com/questions/2006011/crystal-reports-images-and-asp-net-mvc) routes.IgnoreRoute("{resource}.aspx/{*pathInfo}"); and routes.IgnoreRoute("CrystalImageHandler.aspx"); Any ideas as to why the images still 404?

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• ASP.NET MVC 4 async child action

  - by ShadowChaser

  I have an ASP.NET MVC 4 application targeting .NET 4.5. One of our child actions makes a call out to a web service using HttpClient. Since we're blocking on IO waiting for the HttpClient response, it makes a great deal of sense to convert the code to the async/await pattern. However, when MVC 4 attempts to execute the child action, we get the following error message: HttpServerUtility.Execute blocked while waiting for an asynchronous operation to complete. At first glance, it appears as though MVC 4 does not support async/await within a child action. The only remaining option is to run using synchronous code and force a "Wait" on the async task. As we all know, touching .Result or .Wait() on an async task in an ASP.NET context will cause an immediate deadlock. My async logic is wrapped in a class library, so I can't use the "await blah.ConfigureAwait(false)" trick. Remember, tagging "async" on the child action and using await causes an error, and that prevents me from configuring the await. I'm painted into a corner at this point. Is there any way to consume async methods in an MVC 4 child action? Seems like a flat out bug with no workarounds.

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• How do I encapsulate form/post/validation[/redirect] in ViewUserControl in ASP.Net MVC 2

  - by paul

  What I am trying to achieve: encapsulate a Login (or any) Form to be reused across site post to self when Login/validation fails, show original page with Validation Summary (some might argue to just post to Login Page and show Validation Summary there; if what I'm trying to achieve isn't possible, I will just go that route) when Login succeeds, redirect to /App/Home/Index also, want to: stick to PRG principles avoid ajax keep Login Form (UserController.Login()) as encapsulated as possible; avoid having to implement HomeController.Login() since the Login Form might appear elsewhere All but the redirect works. My approach thus far has been: Home/Index includes Login Form: <%Html.RenderAction("Login","User");%> User/Login ViewUserControl<UserLoginViewModel> includes: <%=Html.ValidationSummary("") % using(Html.BeginForm()){} includes hidden form field "userlogin"="1" public class UserController : BaseController { ... [AcceptPostWhenFieldExists(FieldName = "userlogin")] public ActionResult Login(UserLoginViewModel model, FormCollection form){ if (ModelState.IsValid) { if(checkUserCredentials()) { setUserCredentials() return this.RedirectToAction<Areas.App.Controllers.HomeController>(x = x.Index()); } else { return View(); } } ... } Works great when: ModelState or User Credentials fail -- return View() does yield to Home/Index and displays appropriate validation summary. (I have a Register Form on the same page, using the same structure. Each form's validation summary only shows when that form is submitted.) Fails when: ModelState and User Credentials valid -- RedirectToAction<>() gives following error: "Child actions are not allowed to perform redirect actions." It seems like in the Classic ASP days, this would've been solved with Response.Buffer=True. Is there an equivalent setting or workaround now? Btw, running: ASP.Net 4, MVC 2, VS 2010, Dev/Debugging Web Server I hope all of that makes sense. So, what are my options? Or where am I going wrong in my approach? tia!

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