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By default, ASP.NET reserves the .ashx file extension for custom HTTP handlers. This means that you can write a page with the .ashx file extension that points to your custom HTTP handler and not be concerned with registration. The request will be routed to ASP.NET, and ASP.NET will route the request to your HTTP handler. For example, suppose you rewrote the HTTP handler that processes image requests so that it is based on the query string instead of the file name. You could do so simply by changing the evaluation inside the If statements to something like the following.

The source code for the Prism Library assemblies, including the core Prism functionality, plus Unity and MEF extensions, which provide additional components for using Prism with the Unity Application Block (Unity) and the Managed Extensibility Framework..

Request.QueryString.ToString().ToLower().Contains("jellyfish")

There was no object model for the application, and no other testability features, but given the simplicity of the.

You can then add a file to your site with the .ashx extension, as in MyImageHandler.ashx. You add only one line of markup to this file. This line uses the @ WebHandler directive to point to your custom HTTP handler, as in the following.

You can then deploy and call this handler without additional configuration. You would call this handler by using the query string, as in the following.

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Asynchronous programming allows a request to execute on a non-ASP.NET thread, allowing ASP.NET to continue to process incoming requests and making your site more responsive, especially when serving long-running requests. An asynchronous handler returns the request processing thread to ASP.NET and enables it to perform additional actions while the asynchronous task executes. In most web applications, the user cannot interact with the page until page rendering is complete (this applies to partial page updates as well). Therefore, most asynchronous programming in web applications is done to improve the efficiency of longrunning webpages by performing multiple actions simultaneously and freeing the ASP.NET threads to respond to additional requests. For example, consider a webpage that must query a network resource (such as a web service). Because IIS and ASP.NET can only render a limited number of pages simultaneously, the ASP.NET thread pool can become completely consumed, creating a performance bottleneck. When the thread pool has been consumed, your server waits for pages to finish rendering before beginning to process other pages. Even though the server might have available processor cycles, requests are queued. If your application executes these calls asynchronously, the server can begin rendering more pages simultaneously, improving efficiency and increasing scale.

application and the amount of time I had, I dove in to what I call brute force UI automation I quickly wrote some code that could find each of the individual windows on the single screen that made up the application I remember that I was going to look up the specific Windows message that this program used, but I'd hit a roadblock waiting for access to the source code I've never been a fan of waiting around, so I decided to write code that would center the mouse over a specific window on the screen and send a mouse click to that point on the screen After a few more minutes of debugging and testing, I had a simple application that would randomly connect to any available server, verify that the connection was successfully established, and then terminate the terminal server session.

Thread pooling can be tricky. When implementing asynchronous handlers and webpages, use a performance testing tool to verify performance under a heavy load. Sometimes the overhead introduced by asynchronous programming can offset the benefits. Whether performance improves depends on many aspects of the application and web server configuration. One sure way to get performance gains is to create a new thread. There is only one Common Language Runtime (CLR) thread pool per AppDomain, so you must be sure to not just consume the same threads ASP.NET would be using. Instead, create your own.

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