asp.net-use Session in .ashx handler

Following is the technique to use Session in .ashx handler:

public class DownloadHandler : IHttpHandler, System.Web.SessionState.IRequiresSessionState

{

    public void ProcessRequest(HttpContext context)

    {

      string Name = "";

      if (context.Session["UserName"] != null)

         Name = context.Session["UserName"].ToString();

    }

}

Interface used:  IRequiresSessionState this interface is in System.Web.SessionState and Session will be available in context.Session["UserName"]