1、添加引用  System.Web.SessionState;如下实例

2、添加继承 , IRequiresSessionState  如下实例

using System.Web.SessionState;

namespace Survey.Web.myweb
{
    /// <summary>
    /// chanpin_CL 的摘要说明
    /// </summary>
    public class chanpin_CL : IHttpHandler, IRequiresSessionState
    {

....

    context.Session["zhubiaoid"] = strid;

...
3、前台引用

       function add() {
           $('#zhubiaoid').val("<%=Session["zhubiaoid"]%>");
    }