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using System.Web.SessionState;
........
public class Handler : IHttpHandler, IRequiresSessionState
{
    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";
       
         HttpContext.Current.Session["user"] = "luoyisheng";         
       
      }
 
    public bool IsReusable
    {
         get
         {
             return false;
         }
     }
}


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