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来源于：http://www.cnblogs.com/luzx/archive/2011/05/03/2035416.html

有三点需要注意：

1.命名空间中要加入using System.Web.SessionState；

2.接口名要加入IRequiresSessionState或IReadOnlySessionState；

3.不管是Session还是QueryString都要通过HttpContext来获取。

具体代码如下：

<%@ WebHandler Language="C#" Class="UploadHandler" %>

using System;
using System.IO;
using System.Net;
using System.Web;
using System.Web.SessionState;

public class UploadHandler : IHttpHandler, IRequiresSessionState
{
    
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        context.Response.Charset = "utf-8";

        string str1 = context.Session["aaa"].ToString();
        string str2 = context.Request.QueryString["bbb"].ToString();
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }

}