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• Web-Cam Video frames to System.Drawing.Bitmap

  - by Hooch

  Hello. I'm using AForge.NET framework to process some data from webcam. My Image processor is working. class WebProc { public void Process(System.Drawing.Bitmap image) { .... } } I know how to send image from HDD. I was thinking about something like that: private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { while(!backgroundWorker1.CancellationPending) { Bitmap Frame GetVidoFrameSomeWay(); WebProc.Process(Frame); } } Can you help me with those questions? How to get frame from webcam? How to list all available webcam for user to chose from? How to open Webcam setting window? Is there a way to set frame size to 640x480 o user size?

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• how to implement unitofwork pattern when using subsonic 2.1(Repository pattern) ?

  - by ROHITH

  I am using subsonic repository pattern(2.1) for asp.net mvc application.In my application,there are many repositories like categoryRepository,Blogrepository etc.Inside each of this repository i am calling subsonic's DB.Select().From()...ExecuteReader() and then loading domain objects from those reader. In the controller action i make multiple calls from these repositories for e.g. List<IBlog> blogs=_blogRepository.GetHottestBlogs(); List<ICategory> categories=_categoryRepository.GetAll(); do i have to implement any unitofwork pattern for this ?.My doubt is that how subsonic performs each operation DB.Update/Insert/Select .Is a TransactionScope is enough for batch update or do i have to use SharedDbConnectionScope to get better performance?

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• Regular expression to remove all text except...

  - by Barryman9000

  There may be an easier way, and if there is I'm all for it. However - my ASP.NET page has a TON of controls on it, and I've given them all ID's that start with underscore. I copied all the markup into Notepad++ and I'm trying to find a regular expression that will find everything but the controls and replace it with whitespace. that way I'll have a text file that has all my control names which I'll probably throw into Excel and do some string manipulation to add ".Text = " etc. Any suggestions?

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• Should i use HttpResponse.End() for a fast webapp?

  - by acidzombie24

  HttpResponse.End() seems to throw an exception according to msdn. Right now i have the choice of returning a value to say end thread (it only goes 2 functions deep) or i can call end(). I know that throwing exceptions is significantly slower (read the comment for a C#/.NET test) so if i want a fast webapp should i consider not calling it when it is trivially easy to not call it? -edit- I do have a function call in certain functions and in the constructor in classes to ensure the user is logged in. So i call HttpResponse.End() in enough places although hopefully in regular site usage it doesn't occur too often.

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• Where in memory are stored nullable types?

  - by Ondrej Slinták

  This is maybe a follow up to question about nullable types. Where exactly are nullable value types (int?...) stored in memory? First I thought it's clear enough, as Nullable<T> is struct and those are value types. Then I found Jon Skeet's article "Memory in .NET", which says: Note that a value type variable can never have a value of null - it wouldn't make any sense, as null is a reference type concept, meaning "the value of this reference type variable isn't a reference to any object at all". I am little bit confused after reading this statement. So let's say I have int? a = null;. As int is normally a value type, is it stored somehow inside struct Nullable<T> in stack (I used "normally" because I don't know what happens with value type when it becomes nullable)? Or anything else happens here - perhaps in heap?

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• Creating many new instances vs reusing them?

  - by Hugo Riley

  I have multiple business entities in VB.NET Windows Forms application. Right now they are instanced on application startup and used when needed. They hold descriptions of business entities and methods for storing and retrieving data. To cut the long story short, they are somewhat heavy objects to construct (they have some internal dictionaries and references to other objects) created and held in one big global variable called "BLogic". Should I refactor this so that each object is created when needed and released when out of scope? Then every event on UI will probably create a few of this objects. Should I strive to minimize creation of new objects or to minimize number of static and global objects? Generally I am trying to minimize the scope of every variable but should I treat this business logic objects specially?

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• Customise a control in dynamics crm

  - by webturner

  I've written code that can make a phone dial a number from a function call, that's done and dusted. What I would like to achieve is adding a Dial button to each phone number field on the forms in Dynamics CRM. Eventually this could also create a new phone record fill in the basic details and show it to the user to enter notes and an outcome for the phone call, and perhaps some other workflow bits to schedule the next call. Can I put a custom control on a standard form in place of the standard control. I'm assuming it would have to be an IFrame to an asp.net page, that pulls in the record id, and the field name, looks up the number to show in a text box, and passes the number to the DialNumber function. Hey presto... I assume its not going to be that easy... Has anyone tried this before, what's the process, what are the gotchas?

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• Adding custom/new properties to any file regardless of type and extension e.g. setting 'Author' on a

  - by Vaibhav Garg

  I want the ability add properties and tags to a file (specifically ebook files and ebook related properties in Windows 7 but interested to go so for as many OSes as possible) For e.g. Example.txt or Example.doc or Example.epub should all store and carry properties like 'Author', 'Publication date', 'Tags' etc.. the properties should be stored with the file itself. Such that if it is transferred to another system it retains the properties (even if i need to install 'my app' to support this function on the other machine) How do I make this possible using .net (preferred) and what file system concepts should I learn to understand the underlying concepts and limitations to be able to implement this feature? Any application that already does this? Thank you

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• Error "E_UNEXPECTED(0x8000FFFF)" when using CDec/CInt/IsNumeric

  - by Marc vB

  I have encountered a strange problem, which I could solve but don't understand why it did occur. I have build a DLL with COM enabled. In this DLL I have classes that did use the functions CInt, CDec and IsNumeric. If I test these classes from a .NET application then it works ok. But when I called/run these classes from a Win32 application (with COM) then I did get an "E_UNEXPECTED(0x8000FFFF)" error. After some debugging I found out that the problem would go away if I: - replaced IsNumeric with Integer.TryParse or Decimal.TryParse - replaced CInt with Integer.Parse - replaced CDec with Decimal.Parse Can anyone explain this? Again, I could solve it by doing this but I would like to know why.

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• How to Route URL from one domain to another..

  - by Magic

  Hello, I am an C# ASP.NET developer. I am trying to route URL from one domain to another using Godaddy IIS Virtual dedicated server or Dedicated server. For example I have a website application called A_Application in my server. An example URL: www.myserver.com/A_Application/product/bear/?productid=1 or using pretty URL www.myserver.com/A_Application/product/bear/1 I would like to setup for my client to point to A_Application using his/her domain. My Client example URL will be: www.hisserver.com/product/bear/?productid=1 or using pretty URL www.hisserver.com/product/bear/1 Thanks!

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• Instantiating a python class in C#

  - by Jekke

  I've written a class in python that I want to wrap into a .net assembly via IronPython and instantiate in a C# application. I've migrated the class to IronPython, created a library assembly and referenced it. Now, how do I actually get an instance of that class? The class looks (partially) like this: class PokerCard: "A card for playing poker, immutable and unique." def __init__(self, cardName): The test stub I wrote in C# is: using System; namespace pokerapp { class Program { static void Main(string[] args) { var card = new PokerCard(); // I also tried new PokerCard("Ah") Console.WriteLine(card.ToString()); Console.ReadLine(); } } } What do I have to do in order to instantiate this class in C#?

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• How would you implement database updates via email?

  - by jules

  I'm building a public website which has its own domain name with pop/smtp mail services. I'm considering giving users the option to update their data via email - something similar to the functionality found in Flickr or Blogger where you email posts to a special email address. The email data is then processed and stored in the underlying database for the website. I'm using ASP.NET and SQL Server and using a shared hosting service. Any ideas how one would implement this, or if it's even possible using shared hosting? Thanks

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• Compressing as GZip WCF requests (SOAP and REST)

  - by Joannes Vermorel

  I have a .NET 3.5 web app hosted on Windows Azure that exposes several WCF endpoints (both SOAP and REST). The endpoints typically receive 100x more data than they serve (lot of data is upload, much fewer is downloaded). Hence, I am willing to take advantage from HTTP GZip compression but not from the server viewpoint, but rather from the client viewpoint, sending compressed requests (returning compressed responses would be fine, but won't bring much gain anyway). Here is the little C# snippet used on the client side to activate WCF: var binding = new BasicHttpBinding(); var address = new EndpointAddress(endPoint); _factory = new ChannelFactory<IMyApi>(binding, address); _channel = _factory.CreateChannel(); Any idea how to adjust the behavior so that compressed HTTP requests can be made?

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• how to check session upon start in masterpage or in global.asax

  - by user572276

  i am new in asp.net form authentication and sessions i would like to know how to save session in masterpage or in global.asax and how to clear session how to better handle session timeout by redirecting to a page this is my web.config session settings <sessionState mode="InProc" cookieless="false" timeout="1"></sessionState> code in my masterpage if (Request.Url.AbsolutePath.EndsWith("SessionExpired.aspx", StringComparison.InvariantCultureIgnoreCase)) { HtmlMeta meta = new HtmlMeta(); meta.HttpEquiv = "Refresh"; meta.Content = "7; URL=./Login.aspx"; Page.Header.Controls.Add(meta); } else HttpContext.Current.Response.AppendHeader("Refresh", Convert.ToString((Session.Timeout * 60)) + "; Url=./Public/SessionExpired.aspx");

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• How to create Bitmap object from a Graphics object ?

  - by vi.su.

  How to create Bitmap object from a Graphics object ? I would like to read pixels from my Graphics object. for example, like, System.Drawing.BitMap.GetPixel(). I am trying to find out empty area (all white, or of any colour) inside a pdf document, to write some graphics / image. I have tried like this, but it is not working. why the following code is not working as expected ? // // System.Drawing.Bitmap // System.Drawing.Graphics // Bitmap b = new Bitmap(width, height, graphics); // // In this case, for any (i, j) values, Bitmap.GetPixel returns 0 // int rgb = b.GetPixel(i, j).ToArgb(); ( posting this question again in .net-only context, removing other library dependencies )

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• Redirect application's graphical output in Windows Vista/7 (with DWM)

  - by puri

  I want to create a desktop manager that takes informations of all running applications including states and screenshots to display and manipulate them in my virtual space (probably in 3D). It can be considered as another layer of abstraction on top of Windows itself. Because many native Windows Vista/7 features like Flip 3D and Live Thumbnails are able to show each window's activities in real-time e.g. video keeps playing in taskbar's thumbnail, I think DWM allows an application to redirect its output to somewhere else or some special processes are able to collect other applications' graphical outputs (maybe of child processes only). Has Microsoft released a set of public APIs to do so? If not, is it technically possible? And is it easier if I limit my scope to just .NET applications with WPF?

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• How to handle concurrency control in dynamic data?

  - by Andrew

  I've been quite impressed with dynamic data and how easy and quick it is to get a simple site up and running. I'm planning on using it for a simple internal HR admin site for registering people's skills/degrees/etc. I've been watching the intro videos at www.asp.net/dynamicdata and one thing they never mention is how to handle concurrency control. It seems that DD does not handle it right out of the box (unless there is some setting I haven't seen) as I manually generated a change conflict exception and the app failed without any user friendly message. Anybody know if DD handles it out of the box? Or do you have to somehow build it into the site?

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• HttpContext User value changing on its own?

  - by larryq

  Hi everyone, I'm working on an ASP.Net 2.0 application and am having a strange issue involving the HttpContext User. It appears to be changing on its own when I go to a particular page/directory. All of our pages inherit from a base page. In that base page's Page_Load() method we run an authorization check to see if the user can see the page they're going to. We retrieve the user to check against with this code: GenericPrincipal objPrincipal = (GenericPrincipal)Context.User; When I go to this unusual directory the User value isn't me, it's some other username I've never heard of. This username isn't authorized to see these pages, so authorization fails. This mysterious directory isn't a virtual web, just a regular directory in our website, however I've noticed it has its own Web.Config file. I'm guessing that's a cause of the trouble here. My question is, how can I investigate this further, in determining what's changing the User value when I go to this directory?

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• What is the difference between Window.load and document.readyState

  - by prakash

  Hi All, I have one question , In my ASP.NET MVC web application i have to do certain validation once page and all controls got loaded. In javascript i was using belwow line of code for calling a method. window.load = JavascriptFunctionName ; Some one from my team asked me not used above line of code Instead use JQuery to do the same document.attachEvent("onreadystatechange", function() { if (document.readyState === "complete") { CheckThis(); } }); Please help me in understanding what is the difference between two. When i tested by keeping alert in both Jquery check is executing first and calling the CheckThis function where as window.load is taking some time and executing after it. Please suggest

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• Map a domain to an MVC area

  - by Simon_Weaver

  Anybody got any experience in mapping a domain to an MVC area? Here's our situation: Old system (still active but will soon redirect to new store): www.example.com - our main site where we send traffic store.example.com - our store site which is a completely separate site that is indexed in google New system: www.example.com - same site as before www.example.com/store - new store site - built in an ASP.NET MVC area Because store is a separate domain google gives it a separate entry in the search results. I'd like to keep this benefit in future but wondering whether or not there is a good way to map a domain (store.example.com) to the MVC area or if its just going to be more trouble than its worth. PS. I'm not trying to keep existing indexing - its a completely separate store so thats not possible. I just want to redirect to the corresponding page in the new store. I'm just trying not to lose the benefit of two domains for SEO purposes.

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• How do you add folder level documentation to C# assemblies?

  - by Elijah

  Me: I'm a relative new-comer to the .NET platform. Problem In Java, you can add package level documentation to your project by creating a package-info.java or package.html file and storing in the package folder. How do I add equivalent documentation to my project in C# using Visual Studio 2010? Background I like to write documentation describing my motivations in the package/folder level context of the source code projects that I am working on. I have become very accustomed to this workflow in a variety of languages (specifically Java) and I believe that it is a good way to document my project.

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• Possible Performance Considerations using Linq to SQL Repositories

  - by Robert Harvey

  I have an ASP.NET MVC application that uses Linq to SQL repositories for all interactions with the database. To deal with data security, I do trimming to filter data to only those items to which the user has access. This occurs in several places: Data in list views Links in a menu bar A treeview on the left hand side containing links to content Role-based security A special security attribute, inheriting from AuthorizeAttribute, that implements content-based authorization on every controller method. Each of these places instantiates a repository, which opens a Linq to Sql DataContext and accesses the database. So, by my count, each request for a page access opens at least six separate Linq to SQL DataContexts. Should I be concerned about this from a performance perspective, and if so, what can be done to mitigate it?

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• SQL Server Command Timeouts Timeout expired. The timeout period elapsed prior to completion of the o

  - by user104295

  Hi there, we've had a ASP.NET web application deployed for a number of years now.... last week we migrated to a slightly slower server to save some money. Now we're frequently getting command timeouts: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding This is understandable in that a slower server will take longer to produce results; take longer time and produce a timeout. Is there any system-wide way to get SqlClient to set a longer timeout? We cannot change the code, as it's everywhere... we're using multiple data access technologies as well. Maybe there's a default command timeout setting on a connection string? We just need to increase it by 30 seconds; we're happy to wait a bit longer for queries to return. thanks

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• C# Proxy, what is the best way to do this?

  - by Kin

  I'm writing a proxy using .NET and C#. It has a couple of functions that it needs to fulfill. I haven't done much Socket programming, and I am not sure the best way to go about it. Should I use Synchronous Sockets, Asynchronous sockets? Please help! It must... Accept Connections from the client on two different ports, and be able to receive data on both ports at the same time. When a connection is made on a port, it must immediately connect to the server, and start sending data as it receives it from the client to the server. Packets must be forwarded in the order they are received, exactly as they were received. It needs to be as low latency as possible. I don't need the ability for multiple clients to use the proxy, but it would be a nice feature if its easy to implement.

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• Cant open Nerd Dinner 1.0 VS 2008 SP1 MVC 2

  - by josephj1989

  I was trying to download some ASP.NET MVC Sample application to learn MVC. I tried Music Store and TownHall but they wont open in my VS2008.So I tried the common Nerddinner 1.0 but it gives error "The project Type is not supported by this installation" . I tried the 3rd Method suggested in the following post http://stackoverflow.com/questions/1002907/cant-open-nerddinner-project-in-vs2008 This is about changing the project type GUIDS.Now the project loads but when I run it throws an exception <add assembly="System.Web.Mvc, Version=1.0.0.0, Culture=neutral,PublicKeyToken=31BF3856AD364E35" /> I presume this is happening because the Nerddinner 1.0 is for MVC 1.0 and I have MVC 2.0 installed. How do I proceed now. I have spent a lot of time trying to get an MVC application working on my PC. I am happy if I can get any properly architected , MVC application of medium to high complexity to work on my PC. thanks

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