Monday, July 12, 2010

How HttpHandlers work with Example

Watermarking PDF documents using HttpHandlers
Whenever we work with Httphandler we have to inherit IHttpHandler.
We will be unable to inherit IHttpHandler unless & until we add System.web as references.
1>Create a class library with the name Handler

2>Rename the class1.cs with required Class and here it is PdfHandler.

3>Add IHttpHandler interface.If any problem occured just ad the reference System.web from .Net tab listing.

4>Add ProcessRequest and IsReusable Method.

5>Download the iTextSharp.dll and add it to references so as to pdf related function can work.
6>Build the class library.After successfully build dll will be generated.
7>Create a new website TestPdfRender and add the binary output of the custom handler as a reference.

8>Add the handler to the web.config.

9>To map the .pdf extension through IIS: within IIS, right click on TestPdfRender->properties->under Directory tab, click on configuration->add a new extension with extension .pdf and set Executable to the .NET runtime ("c:\windows\\framework\v2.0.50727\aspnet_isapi.dll")

keep the rest of the sections to their default values.
Click on OK to close all the open configuration windows.
Note:here IIS 6 have one error after selecting the dll at once ok button is not being enable.Just click on the executable text box then ok button is enable.

10>Now the application is ready for the default.aspx and add this test hyperlink control:

11>Genereated output is.

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