Server.transfer and HTTP Handler

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handler

Hi,

I want to call http handler on button click event. but i am getting error "Enable to procecc child Request Handler.ashx"

this is my code on button click.

protected void Button1_Click(object sender, EventArgs e)
        {
            server.transfer("Handler.ashx",true);//Here i am getting error
        }
and My Handler is
 public class Handler : IHttpHandler,IRequiresSessionState 
    {
        public void ProcessRequest(HttpContext context)
        {
           //Block of Code to be executed
        }
   public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }

What is the Problem with that? Please help me.
Thanks in Advance.