Question

When I add an HTTP handler:

<add verb='*' path='*test.aspx' type='Handler'/> 

With the class:

using System; using System.Web;  public class Handler : IHttpHandler {      public void ProcessRequest(HttpContext context)     {         context.Response.ContentType = 'text/plain';         context.Response.Write('Hello World');     }      public bool IsReusable     {         get { return false; }     }  } 

My ASP.NET application dies with the error ‘Could not load type ‘Handler’.’ when I try to access http://localhost:port/mysite/this-is-a-test.aspx.

I thought maybe it was a namespace issue, so I tried what follows, but got the same ‘Could not load type ‘Test.Handler’.’ error.

<add verb='*' path='*test.aspx' type='Test.Handler, Test'/> 

With the class:

using System; using System.Web;  namespace Test {      public class Handler : IHttpHandler     {          public void ProcessRequest(HttpContext context)         {             context.Response.ContentType = 'text/plain';             context.Response.Write('Hello World');         }          public bool IsReusable         {             get { return false; }         }      }  } 

I knew I was getting rusty with ASP.NET, but I’m without a clue on this one.

Answer 1

I guess you are using a web site project in contrast of web application project. In this case you need to put the code behind file of your handler (Handler.cs) in the special App_Code folder. The markup file (Handler.ashx) may be at the root of your site:

<%@ WebHandler Language='C#' Class='Handler' CodeBehind='Handler.cs' %> 

Then you can directly declare your handler in web.config:

<add verb='*' path='*test.aspx' type='Handler'/>