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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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  • 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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  • ASP.NET Membership - Change password without asking the old (WITH Question and Answer)

    - by djsolid
    I have received many comments and questions about how you can do what is described in this post when you site requires question and answer. The solution is definiterly not the best and should be used with EXTREME caution because in a high traffic website can cause problems but I write it down anyway. We will use reflection in order to solve our problem. And this is the code But this code changes the only instance of MembershipProvider meaning if you access somewhere else from your application the property RequiresQuestionAndAnswer until you set back it’s original value you will get false instead of true. So again be VERY careful. Hope you find it useful!

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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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  • Intro to Sessions in ASP.Net

    Sessions are used to pass the value from one page to another with no effort from the user. With a session, if the user inputs values on the original page and you need to access them on another page, you can retrieve the values stored in the session without making the user submit those values again. Sessions are important to any user-related authentication (if you're using the https protocol), user-related validation and customization of visitor experiences in your website. This tutorial will use Visual Basic to illustrate ASP.NET sessions, though the code can be converted to equivalent C# code...

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  • Weird - "The EntityReference object could not be serialized" when serializing from an ASP.NET Web Si

    - by Mikey Cee
    I have an Entity Framework data model. Part of the model is a Customer entity. The web service provides a method to get a customer, and to receive an updated version of this customer to be persisted. To test this, I created a new ASP.NET web Application, (Solution Add New Project ASP.NET Web Application), then added a reference to my service reference using the standard Add Service Reference dialog. I then call the service using the following code: var client = new CustomerServiceClient(); var customer = client.GetCustomerByID(18); // get it customer.LimitDown = 100; // change it client.SaveCustomer(customer); // persist it Everything works as expected. Now, I do exactly the same thing, but this time with as ASP.NET Web Site (Solution Add New Web Site ASP.NET Web Site). I add the reference in a similar fashion and copy and paste the code above into the new site. But now I get the following exception thrown on the 4th line: System.InvalidOperationException The EntityReference object could not be serialized. This type of object cannot be serialized when the RelationshipManager belongs to an entity object that does not implement IEntityWithRelationships. Source Error: Line 2474: Line 2475: public SkyWalkerCustomerService.OperationResult SaveCustomer(SkyWalkerCustomerService.Customer customer) { Line 2476: return base.Channel.SaveCustomer(customer); Line 2477: } Line 2478: } Stack Trace: System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) +9475203 System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) +345 SkyWalkerCustomerService.ICustomerService.SaveCustomer(Customer customer) +0 SkyWalkerCustomerService.CustomerServiceClient.SaveCustomer(Customer customer) in c:\Windows\Microsoft.NET\Framework\v4.0.30128\Temporary ASP.NET Files\testsite2\dd2bcf8d\f95604ff\App_WebReferences.fz4h7x7l.0.cs:2476 _Default.Page_Load(Object sender, EventArgs e) in c:\Users\Mike\Documents\Repositories\UWC\SkyWalker\TestSite2\Default.aspx.cs:17 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35 System.Web.UI.Control.OnLoad(EventArgs e) +91 System.Web.UI.Control.LoadRecursive() +61 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1966 Googling for this error returns very little. Why doesn't this work?

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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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  • Searching for flexible way to specify conenction string used by APS.NET membership

    - by bzamfir
    Hi, I develop an asp.net web application and I use ASP.NET membership provider. The application uses the membership schema and all required objects inside main application database However, during development I have to switch to various databases, for different development and testing scenarios. For this I have an external connection strings section file and also an external appsettings section, which allow me to not change main web.config but switch the db easily, by changing setting only in appsettings section. My files are as below: <connectionStrings configSource="connections.config"> </connectionStrings> <appSettings file="local.config"> .... ConnectionStrings looks as usual: <connectionStrings> <add name="MyDB1" connectionString="..." ... /> <add name="MyDB2" connectionString="..." ... /> .... </connectionStrings> And local.config as below <appSettings> <add key="ConnectionString" value="MyDB2" /> My code takes into account to use this connection string But membership settings in web.config contains the connection string name directly into the setting, like <add name="MembershipProvider" connectionStringName="MyDB2" ...> .... <add name="RoleProvider" connectionStringName="MyDB2" ...> Because of this, every time I have to edit them too to use the new db. Is there any way to config membership provider to use an appsetting to select db connection for membership db? Or to "redirect" it to read connection setting from somewhere else? Or at least to have this in some external file (like local.config) Maybe is some easy way to wrap asp.net membership provider intio my own provider which will just read connection string from where I want and pass it to original membership provider, and then just delegate the whole membership functionality to asp.net membership provider. Thanks.

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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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  • Implementing Custom CacheDependency to invalidate ASP.Net cache item

    - by Ajay
    Hi, I want to implement my own customCacheDependency class by deriving base CacheDependency, as provided SqlCacheDependency is not suitable for my case. (thousands of cache items, and there will so many subscriptions in SQL as well as issues with registration in ASP.Net) I want to use this in ASP.Net VirtualPathProvider's our custom implementation, so I can pass this CustomCacheDependecy to notify the asp.net that file content in the DB has changed. Can some one point me to any custom implementation of CacheDependency (preferably using MessageQueue)? Thanks & Regards, Ajay

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  • Lightweight .NET web development?

    - by Breck Fresen
    Fellow stack overflowers, I'm currently working on a project that has a sizable amount of both client and web code. The client code is written in C# and the web piece is written in PHP. Maintaining consistency between the two worlds is becoming cumbersome, and I want consolidate the web code to .Net. The issue is that I hate web development in ASP.Net Web Forms. I want something as raw as PHP, just using C# instead. I've read a little about ASP.Net MVC, but it looks like it abstracts too much of the request logic for my liking. Does anyone know of a lightweight way to allow C# + .Net to handle web requests? Should I be looking more closely at MVC? Thanks in advance, -- Breck

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  • ASP.NET MVC & Detached Entity won't save

    - by Justin
    Hey all, I have an ASP.NET MVC POST action for saving an entity on submit of a form. It works fine for insert but doesn't work for update, the database doesn't get called, so it's clearly not tracking the changes, as it's "detached". I'm using Entity Framework w/.NET 4: //POST: /Developers/Save/ [AcceptVerbs(HttpVerbs.Post)] public ActionResult Save(Developer developer) { developer.UpdateDate = DateTime.Now; if (developer.DeveloperID == 0) {//inserting new developer. DataContext.DeveloperData.Insert(developer); } //save changes - TODO: doesn't update... DataContext.SaveChanges(); //redirect to developer list. return RedirectToAction("Index"); } Any ideas would be greatly appreciated, thanks, Justin

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  • Mixing application modules between Silverlight and ASP.NET

    - by jkohlhepp
    Background: I work in a suite of ASP.NET applications that have several different "modules". The applications all share a main menu, so they all link to one-another. The modules are the high-level areas of the application. So, for example, it might be Payments, Orders, Customers, Products, etc. And Payments and Orders are in one app and Products and Customers are in another. Some of these menu links are "deep links", for example it might be a link to a particular page within the Customers module, such as Create New Customer. The issue: We are about to start a project that will add several more modules to this suite, probably as a new .NET application. I'm thinking about doing these new modules in Silverlight (for various reasons that are not material to the question). If I were to do that, I need to make the menu look the same as the menu in ASP.NET, as the users still need to feel like they are inside one "application". My questions: How should I organize the Silverlight project(s) so that I can "deep link" from ASP.NET pages into particular modules in the Silverlight app? What is even the best idea for creating these different Silverlight "modules"? If I had something that would've been a page in ASP.NET (for example - Create Customer), should each one of those be a separate Silverlight app? Or should it be a separate User Control? Or something else? Should I reuse our shared ASP.NET menu, and deep link to different Silverlight "modules" even within the new application? Or should I reimplement the menu in Silverlight for navigation within the app? Are there menu controls for Silverlight that look similar to ASP.NET menus (with flyout submenus in this case)? Could I maybe even share a SiteMap XML file between them? Edit: After looking around a bit more, it seems like PRISM might be the answer for some of my issues. It would allow me to modularize the different chunks of Silverlight that I have. And it would allow me to define a "master page" in Silverlight where I could host the menu. Do I have this right?

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  • Handle .NET exceptions within Classic ASP pages

    - by Tyler
    Hi All, I am making MSSQL stored procedure CLR calls from ASP pages. When an exception occurs, it is logged and then rethrown. In this scenario I need to be able to handle the exception (if possible) in the ASP page. Note that I cannot move away from classic ASP in this instance; I am stuck within a legacy system for this project. Please let me know if you know of a way to handle the exceptions in classic ASP. I appreciate the help! Thanks, Tyler

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  • Long overdue (for me) question about disposing managed objects in .Net, VB.Net, C#

    - by Jules
    I can't believe I'm still confused about this but, any way, lets finally nail it: I have a class that overrides OnPaint to do some drawing. To speed things up, I create the pens, brushes etc before hand, in the construtor, so that OnPaint does not need to keep creating and disposing them. Now, I make sure that I always dispose of such objects, but I have the feeling I don't need to because, despite the fact they implement IDisposable, they're managed objects. Is this correct?

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  • How do I compress a Json result from ASP.NET MVC with IIS 7.5

    - by Gareth Saul
    I'm having difficulty making IIS 7 correctly compress a Json result from ASP.NET MVC. I've enabled static and dynamic compression in IIS. I can verify with Fiddler that normal text/html and similar records are compressed. Viewing the request, the accept-encoding gzip header is present. The response has the mimetype "application/json", but is not compressed. I've identified that the issue appears to relate to the MimeType. When I include mimeType="*/*", I can see that the response is correctly gzipped. How can I get IIS to compress WITHOUT using a wildcard mimeType? I assume that this issue has something to do with the way that ASP.NET MVC generates content type headers. The CPU usage is well below the dynamic throttling threshold. When I examine the trace logs from IIS, I can see that it fails to compress due to not finding a matching mime type. <httpCompression directory="%SystemDrive%\inetpub\temp\IIS Temporary Compressed Files" noCompressionForProxies="false"> <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" /> <dynamicTypes> <add mimeType="text/*" enabled="true" /> <add mimeType="message/*" enabled="true" /> <add mimeType="application/x-javascript" enabled="true" /> <add mimeType="application/json" enabled="true" /> </dynamicTypes> <staticTypes> <add mimeType="text/*" enabled="true" /> <add mimeType="message/*" enabled="true" /> <add mimeType="application/x-javascript" enabled="true" /> <add mimeType="application/atom+xml" enabled="true" /> <add mimeType="application/xaml+xml" enabled="true" /> <add mimeType="application/json" enabled="true" /> </staticTypes> </httpCompression>

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  • Using a .MDF SQL Server Database with ASP.NET Versus Using SQL Server

    - by Maxim Z.
    I'm currently writing a website in ASP.NET MVC, and my database (which doesn't have any data in it yet, it only has the correct tables) uses SQL Server 2008, which I have installed on my development machine. I connect to the database out of my application by using the Server Explorer, followed by LINQ to SQL mapping. Once I finish developing the site, I will move it over to my hosting service, which is a virtual hosting plan. I'm concerned about whether using the SQL Server setup that is currently working on my development machine will be hard to do on the production server, as I'll have to import all the database tables through the hosting control panel. I've noticed that it is possible to create a SQL Server database from inside Visual Studio. It is then stored in the App_Data directory. My questions are the following: Does it make sense to move my SQL Server DB out of SQL Server and into the App_Data directory as an .mdf file? If so, how can I move it? I believe this is called the Detach command, is it not? Are there any performance/security issues that can occur with a .mdf file like this? Would my intended setup work OK with a typical virtual hosting plan? I'm hoping that the .mdf database won't count against the limited number of SQL Server databases that can be created with my plan. I hope this question isn't too broad. Thanks in advance! Note: I'm just starting out with ASP.NET MVC and all this, so I might be completely misunderstanding how this is supposed to work.

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  • ASP.NET: Button in user control not posting back

    - by Ronnie Overby
    I have a simple user control with this code: <%@ Control Language="C#" AutoEventWireup="true" CodeFile="Pager.ascx.cs" Inherits="Pager" %> <table style="width: 100%;"> <tr> <td runat="server" id="PageControls"> <!-- This button has the problem: --> <asp:Button ID="btnPrevPage" runat="server" Text="&larr;" OnClick="btnPrevPage_Click" /> Page <asp:DropDownList runat="server" ID="ddlPage" AutoPostBack="true" OnSelectedIndexChanged="ddlPage_SelectedIndexChanged" /> of <asp:Label ID="lblTotalPages" runat="server" /> <!-- This button has the problem: --> <asp:Button ID="btnNextPage" runat="server" Text="&rarr;" OnClick="btnNextPage_Click" /> </td> <td align="right" runat="server" id="itemsPerPageControls"> <asp:Literal ID="perPageText1" runat="server" /> <asp:DropDownList ID="ddlItemsPerPage" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlItemsPerPage_SelectedIndexChanged" /> <asp:Literal ID="perPageText2" runat="server" /> </td> </tr> </table> As you can see, the 2 buttons are wired to click events, which are defined correctly in the code-behind. Now, here is how I include an instance of the control on my page: <uc:Pager ID="Pager1" runat="server" TotalRecords="100" DisplayItemsPerPage="true" ItemsPerPageChoices="10,25,50,100" ItemsPerPageFormatString="Sessions/Page: {0}" PageSize="25" OnPageChanged="PageChanged" OnPageSizeChanged="PageChanged" /> I noticed though, that the 2 buttons in my user control weren't causing a post back when clicked. The drop down list does cause postback, though. Here is the rendered HTML: <table style="width: 100%;"> <tr> <td id="ctl00_MainContent_Pager1_PageControls" align="left"> <!-- No onclick event! Why? --> <input type="submit" name="ctl00$MainContent$Pager1$btnPrevPage" value="?" id="ctl00_MainContent_Pager1_btnPrevPage" /> Page <select name="ctl00$MainContent$Pager1$ddlPage" onchange="javascript:setTimeout('__doPostBack(\'ctl00$MainContent$Pager1$ddlPage\',\'\')', 0)" id="ctl00_MainContent_Pager1_ddlPage"> <option value="1">1</option> <option selected="selected" value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> <option value="6">6</option> </select> of <span id="ctl00_MainContent_Pager1_lblTotalPages">6</span> <!-- No onclick event! Why? --> <input type="submit" name="ctl00$MainContent$Pager1$btnNextPage" value="?" id="ctl00_MainContent_Pager1_btnNextPage" /> </td> <td id="ctl00_MainContent_Pager1_itemsPerPageControls" align="right"> Sessions/Page: <select name="ctl00$MainContent$Pager1$ddlItemsPerPage" onchange="javascript:setTimeout('__doPostBack(\'ctl00$MainContent$Pager1$ddlItemsPerPage\',\'\')', 0)" id="ctl00_MainContent_Pager1_ddlItemsPerPage"> <option value="10">10</option> <option selected="selected" value="25">25</option> <option value="50">50</option> <option value="100">100</option> </select> </td> </tr> </table> And, as you can see, there is no onclick attribute being rendered in the button's input elements. Why not?

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  • Display ASP.NET Control on Event

    - by Steven
    I'm looking to create a custom date picker with code examples from several sources. Is the code to display/hide an ASP.NET control when a user clicks a button usually done with JavaScript or ASP.NET code? Please provide a simple example. (If ASP.NET, VB example preferred over C#)

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  • asp.net Membership : Extending Role membership?

    - by mark smith
    Hi there, I am been taking a look at asp.net membership and it seems to provide everything that i need but i need some kind of custom Role functionality. Currently i can add user to a role, great. But i also need to be able to add Permissions to Roles.. i.e. Role: Editor Permissions: Can View Editor Menu, Can Write to Editors Table, Can Delete Entries in Editors Table. Currently it doesn't support this, The idea behind this is to create a admin option in my program to create a role and then assign permissions to a role to say "allow the user to view a certain part of the application", "allow the user to open a menu item" Any ideas how i would implement soemthing like this? I presume a custom ROLE provider but i was wondering if some kind of framework extension existed already without rolling my own? Or anybody knows a good tutorial of how to tackle this issue? I am quite happy with what asp.net SQL provider has created in terms of tables etc... but i think i need to extend this by adding another table called RolesPermissions and then I presume :-) adding some kind of enumeration into the table for each valid permission?? THanks in advance

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