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• Image Uploading - security issues

  - by TenaciousImpy

  Hi, I'm developing an ASP.NET Web app and would like the user to be able to either upload an image from their local system, or pass in a URL to an image. The image can either be a JPG or PNG. What security issues should I be concerned about doing this? I've seen various ways of embedding code within JPG files. Are there any methods in C# (or external libraries) which can confirm that a file is a JPG/PNG, otherwise throw an error? At the very least, I'm making the directory which holds uploaded images non-browsable and putting a max size limit of 1mb, but I'd like to implement further checks. Thanks for any advice.

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• Problem with View - it does not refresh after db update

  - by crocodillez

  Hi, I am working with small ASP.NET MVC project - online store. I have addToCart method which adds selected product to cart - it updates cart table in my db and showing cart view with its content. But I have problems. While db is updating correctly the view does not. I see that quantity of the product in my db is incremented correctly but quantity in view is not changed. I have to stop debugging my app in visual studia and restart it - then my view is showing correct data. What can be wrong?

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• SharpSSH gets stuck in an infinite stream read in C# SSH app

  - by Ric Coles

  Afternoon all, I'm having a small problem with the SharpSSH library for .Net (see http://www.tamirgal.com/blog/page/SharpSSH.aspx) SshStream ssh = new SshStream("some ip address", "some username", "some password"); ssh.Prompt = "\n"; ssh.RemoveTerminalEmulationCharacters = true; ssh.Write("ssh some ip address"); // Don't care about this response ssh.ReadResponse(); ssh.Write("lss /mnt/sata[1-4]"); // Don't care about this response (for now) ssh.ReadResponse(); // while the stream can be read while (ssh.CanRead) { Console.WriteLine(ssh.ReadResponse()); } ssh.Close(); As you can see, it's fairly straight forward. However, when the while-loop gets stepped into, it won't break out of the loop when everything has been printed to the console and there is nothing else to read. Is there anyway I can manually force it to break when there is nothing else to be read? Cheers, Ric

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• Edit a video to embed a bitmap.

  - by Rajkumar R

  I would like to edit a video so that i can embed a small bitmap image at any corner. The bitmap image has to be replaced with another image, for every two video frames. If somehow it is possible to covert a group of pictures into slideshow video then i want that video to be embedded at the corner of the main video. The size of the bitmap is about the size of a channel logo and that is exact space it will occupy in the video. Please guide me in accomplishing. Is there any existing libraries available to do this. I am working on .Net 4 platform but i do

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• Document.ready() failing on popup

  - by Seth Duncan

  I am using ASP.Net and jQuery/jQuery UI and I am trying to use the datepicker control. It works fine on every page, except when I have to use the popup (to add new data into the database and then i refresh the current page to reflect the new data being entered). It seems that document.ready() is failing when I use the popup. I can invoke the datepicker control manually with adding a click event to fire off the showcalendar function, however I want to try and make it work. Does anyone have any ideas of why a popup would fail document.ready() ? Thanks!

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• Howto allow "Illegal characters in path" ?

  - by hbruce

  I have a MVC.NET application with one route as follows: routes.MapRoute("member", "member/{id}/{*name}", new { controller = "member", action = "Details", id = "" }, new { id = @"\d+" }); Thus, a link could be something like this: http://domain/member/123/any_kind_of_username This works fine in general but if the path contains illegal characters (e.g. a double qoute: http://domain/member/123/my_"user"_name) I get a "System.ArgumentException: Illegal characters in path." After much googling the best suggestions seems to be to make sure that the url doesn't contain any such characters. Unfortunately, that is out of my control in this case. Is there a way to work around this?

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• Best way to hide a window from the Alt-Tab program switcher?

  - by chaiguy1337

  I've been a .NET developer for several years now and this is still one of those things I don't know how to do properly. It's easy to hide a window from the taskbar via a property in both Windows Forms and WPF, but as far as I can tell, this doesn't guarantee (or necessarily even affect) it being hidden from the Alt-Tab dialog. I've seen invisible windows show up in Alt-Tab, and I'm just wondering what is the best way to guarantee a window will never appear (visible or not) in the Alt-Tab dialog. Update: Please see my posted solution below. I'm not allowed to mark my own answers as the solution, but so far it's the only one that works. Update 2: There's now a proper solution by Franci Penov that looks pretty good, but haven't tried it out myself. Involves some Win32, but avoids the lame creation of off-screen windows.

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• Add columns to SqlWebEventProvider

  - by Julien N

  In an asp.net application, we'd like to use the SqlWebEventProvider to log any Event that occurs during the application lifetime. The problem is that we think that the table aspnet_WebEvent_Event doesn't provide enough columns and should log more information (we need to keep the Logged user). I'm aware that this information could be stored in the "Details" column but it wouldn't then be really simple to filter the results and build reports. So I'm searching for a simple solution to add a column. I wish I could derive SqlWebEventProvider but the methods used to build the stocked procedure parameters are private (PrepareParams() and FillParams()). Any simple solution that doesn't imply to rewrite the entire Provider class ?

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• Unable to use Client Application Services with custom MembershipProvider.

  - by Shimmy

  Hi, I have a Windows-Forms Application that I configured to use with an ASP.NET Service that is an Authentication service using a custom MembershipProvider. When I call Membership.CreateUser in the Windows Application a NotSupportedException is thrown telling: "Specified method is not supported.". I tried creating a web page in the website and test the MembershipProvider, everything works just fine when woeking from within the website. Any ideas or link for how to use custom (not SqlMembershipProvider) MembershipProvider will be really appreciated! Edit: The method ValidateUser does work. The overriden CreateUser doesn't work I tried Override Sub CreateUser(.......) As MembershipUser Return New User() End Sub But I still get the same excetption as before.

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• Caching web page data, Database or File

  - by Mahdi

  I am creating an RSS reader application that requests the RSS from my server. I mean, the RSS is first downloaded to my server, then application downloads it from my server. I want to create RSS cache for this. And for example, each RSS would be refreshed every 1 minute. So, If 10 users request RSS of example.com in 1 minute, my server will download it only for the first time, and in other 9 requests, RSS will be loaded from cache. My question is, Should I use a Database (MSSQL) for this purpose? or I should use files? I have no limit in Database size nor in file size... EDIT: I'm using ASP.NET for the server.

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• How to make Databinding type safe and support refactoring

  - by Ian Ringrose

  When I wish to bind a control to a property of my object, I have to provide the name of the property as a string. This is not very good because: If the property is removed or renamed, I don’t get a compiler warning. If a rename the property with a refactoring tool, it is likely the data binding will not be updated. I don’t get an error until runtime if the type of the property is wrong, e.g. binding an integer to a date chooser. Is there a design-paten that gets round this, but still has the ease of use of data-binding? (This is a problem in WinForm, Asp.net and WPF and most likely lots of other systems) I have now found "workarounds for nameof() operator in C#: typesafe databinding" that also has a good starting point for a solution.

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• What is the best way to manage one's session variables?

  - by donde

  In my .NET web app, I keep basic user info in a user session object. I also usually keep a director class in the session; which is basically just has info about whatever thing it being worked on on that screen (like a customer id). I am trying to keep from adding a ton of sessions. I also want to make sure at any given time ONLY the sessions that are necessary are in memory. This means I need an effective way of managing my session variables. Any suggestions?

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• What's the difference between IEquatable and just overriding Object.Equals() ?

  - by devoured elysium

  I want my Food class to be able to test whenever it is equal to another class. I will later use it against a List, and I want to use its List.Contains() method. Should I implement IEquatable or just override Object.Equals()? From MSDN: This method determines equality by using the default equality comparer, as defined by the object's implementation of the IEquatable.Equals method for T (the type of values in the list). So my next question is: which functions/classes of the .NET framework make use of Object.Equals()? Should I use it in the first place? Thanks

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• Ideal dev/test/QA environment for development

  - by Nick

  I am working to rebuild my company's dev/test/QA environment. We have 10-15 programmers that are involved in a number of projects. They currently all develop locally on their PCs and use the dev environment for testing. We currently do not have a QA environment, so deployments are frequently a pain because bugs are usually found after something has gone live. Here's what I envision: Doing away with everyone's local admin privileges and making everyone develop on a dev server Create a QA environment that is identical to our production systems. This will allow them to test deployments. Create a new test environment that is more locked down than the dev server so that proper testing can be done. What are your thoughts? What is the best way to set up an environment like this? We develop ASP .NET applications using MS Visual Studio 2008 (if that helps).

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• How do I assign a value to a MailMessage ReplyTo property?

  - by Zack Peterson

  I want to set the ReplyTo value for a .NET MailMessage. MailMessage.ReplyTo Property: ReplyTo is obsoleted for this type. Please use ReplyToList instead which can accept multiple addresses. MailMessage.ReplyToList Property: Gets or sets the list of addresses to reply to for the mail message. But, ReplyToList is ReadOnly. I've tried to use the MailMessage.Headers property like this: mail.Headers.Add("Reply-To", "[email protected]"); as described here: System.Web.Mail, OH MY! But, that doesn't seem to work. How do I set the value(s) of the MailMessage's ReadOnly property ReplyToList?

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• Passing complex objects to javascript via IScriptControl

  - by Jeff Dege

  I'm playing around with a asp.net page that's using the IScriptControl interface to pass data from the code-behind to the custom javascript object running on the browser. I'm passing a number of properties via IScriptControl.GetScriptDescriptors(), and they're all working fine, except for one. That one is a class derived from System.Collections.Generic.Dictionary<. And even that one has been working for me, so long as the elements in the collection were scalars - ints, doubles, and strings. But when I tried to pass a member of a class, it showed up as a null object in the javascript. The class in question is marked [Serializable]. I changed it to a struct, and got the same behavior. It looks as if the serializer used in IScriptControl does a shallow copy. I need a deep copy. Any ideas?

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• How can you increase timeout in Linq2Entities?

  - by Russell Steen

  I'm doing a basic select against a view. Unfortunately the result can be slow and I'm getting timeout errors intermittently. How can I increase the timeout? Using .NET 3.5, Sql Server 2000, Linq2Entities I'm using the very basic query List<MyData> result = db.MyData.Where(x.Attribute == search).ToList(); Fixing the query so that it's faster on the DB side is not an option here. Exact Error: "Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding." Update: I'd prefer to just change it for this one query.

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• JQuery $.getJSON appends a question mark to the request URL

  - by David Neale

  I have the folliwng JSON request code on an ASP.NET MVC web application: var userID = 'id=' + $('#namesList').val(); $.getJSON('/Person/GetPerson/', userID, function(data) { $('#collar').text(data.collarNumber); $('#name').text(data.Name); $('#email').text(data.EmailAddress); }); This creates a request such as: http://localhost:48610/Person/GetPerson/?id=6. Why is there a question mark in there? I get the server error The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32'.... If I make the request manually without the question mark it works fine.

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• Difference in DLL when compiling on Build Server instead of Dev Machine.

  - by Achilles

  I have an application that loads user controls into .NET web application. When I compile and test the application locally on my dev machine it works on my machine. The project builds successfully using MSBuild on our build server. However when I deploy the dll generated by MSBuild on the build server I get the following error when the application loads the control: BC30456: 'CreateResourceBasedLiteralControl' is not a member of 'ASP.usercontrols_somecontrol_ascx'. I took a look and compared the dll generated on my machine and compared it(looked at the file size) with the one created by the build server and noticed a difference in the file size. This is confusing considering the code being built locally and on the build server is IDENTICAL. I manually compared each file by hand. So my question is: What is causing this error? What would be different between MSBuild's compilation of the code and what is going on in Visual Studio when compiling the code?

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• Distribute EXE without config file (Webservice in WinForm)

  - by Marc vB

  I have created a WinForm app (VB.NET 2008) that references to a webservice which was added via "Add Service Reference". The app works ok. Question is about distribution of the app. It looks like I need to install the app's config file with the EXE, however I don't want that because the config files shows the actual url of the web service which is not whatt I want. So, is it possible to use a webservice in a WinForm app and only have to install the resulting EXE?

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• ListChildren SQL Reporting Service

  - by markpirvine

  Hi, I'm trying to get a list of available reports via the webservice for SQL Reporting Services 2005 express edition. Each time I try to call the ListChildren method I get an insuffient permission exception. The code is: ReportingService2005SoapClient rService = new ReportingService2005SoapClient(); CatalogItem[] cItems = null; rService.ListChildren("/", false, out cItems); I added the ASP.net (iusr) account into the local admin group on the PC and still get the exception. Is this method supported in the express edition? Mark

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• Debugger does not break when debugging PowerShell console

  - by Adam Driscoll

  I'm developing a binary PowerShell module. I have a post build event that copies that module into the 'modules' directory in my "Documents\WindowsPowerShell" folder. I then have the project set to launch PowerShell.exe. My module is loaded via Import-Module and off I go. The problem is my break points are never hit and the debugger does not break on exceptions. If I run PowerShell outside of Visual Studio and then attach the debugger to the process I can break just fine. The other strange this is that my break points are not empty. Typically if different source versions are loaded they will be. I'm running Visual Studio 2010 on a Win 7 box. My module is currently targeting .NET 3.5. I've tried running both the x64 and x86 versions of PS with no luck.

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• How can I trigger a server-side event from a client-side event?

  - by danish

  Short version All I need is that, in a ModalPopUp, when the DoubleClick event of a ListItem fires, the click event of my OK button should be executed. Detail I have a ModalPopUpExtender, which hosts a user control. The user control has an OK and a Cancel button. Along with that, it has a dynamic ListBox added to it. So far, I've considered the following possible solutions: Use Ajax.Net. But, I cannot afford to have a WebMethod. Use a ClientScriptCallBack. This will need a lot of JavaScript, since I have made almost every control dynamic. Is there any other way apart from using an UpdatePanel?

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• Separation of concerns and authentication

  - by Tom Gilder

  I'm trying to be a Good Developer and separate my concerns out. I've got an ASP.NET MVC project with all my web code, and a DAL project with all the model code. Sometimes code in the DAL needs to check if the current user is authorized to perform some actions, by checking something like CurrentUser.IsAdmin. For the web site, the current is derived from the Windows username (from HttpContext.Current.User.Identity), but this is clearly a web concern and shouldn't be coupled to the DAL. What's the best pattern to loosely couple the authentication? Should the DAL be asking the MVC code for a username, or the MVC be telling the DAL? Are there advantages or disadvantages to one or the other? Thank you!

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• Web-To-Print - What technology should I explore? Web-Content -> drag & drop to Templates -> PDF

  - by hamlin11

  I'm discussing some software design issues with a potential client and the idea of Web-to-Print technology has come up. We need users to be able to drag images from an image library to various regions defined by a template. Example: Images may go in box A, B, or C and text may go in boxes D or E. These templates would be setup Boxes A through E would be defined inside a template by administrators using some sort of editor. These templates would serve as a mapping from web-content to a PDF. Once users drag images and insert text in the appropriate regions of the template, the result will be converted into a PDF. Is this feasible these days with jquery & asp.net? That would be nice. If not, what would be the ideal solution?

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