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When we add a new item to an ASP.NET web application project in Visual Studio 2010, I have noticed two templates:
What is the difference between these two and when are they used?
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ASHX Generic Handler is a concept to return dynamic content. It is used to return ajax calls, image from a query string, write XML, or any other data.
What is an ASHX file? An ASHX file is a webpage that is used by the ASP.NET HTTP Handler to serve user with the pages that are referenced inside this file. The ASP.NET HTTP Handler processes the incoming request, references the pages from the . ashx file, and sends back the compiled page back to the user's browser.
Generic handler is a dynamic file and is generated with c# code and disk resource. Generic handler do not have web forms. Generic handler is also known as ASHX generic handler. It is useful when we want to return image from a query string,write XML and other Data.
An HTTPhandler may be defined as an end point that is executed in response to a request and is used to handle specific requests based on extensions. The ASP.Net runtime engine selects the appropriate handler to serve an incoming request based on the file extension of the request URL.
Generic handler:
Generic Handler is a default handler which will have @webhandler directive and has .ashx extension this generic handler is not having UI but it provides response when ever any request made to this handler.
HTTP Handler:
HTTP Handler is a process which runs and continue to server request and give response based on the request handling code. This handler does not have UI and need to configured in the web.config against extensions. One of the great example of Http Handler is page handler of ASP.NET which serves .aspx pages request.
The Main difference between Generic and HTTP handler is
Generic handler has a handler which can be accessed by url with .ashx extension while http handler is required to be configured in web.config against extension in web.config.It does not have any extension.Typical example of generic handler are creating thumbnails of images and for http handler page handler which serves .aspx extension request and give response.
To know more refer this link
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