把 ArrayList 的值存入Session 当从Session 中取值时遇到问题；
向Session存入数据

C# code

  myconnection.Open();            //详细内容分页            SqlDataAdapter da = new SqlDataAdapter(mycommand);            DataSet ds = new DataSet();            da.Fill(ds, "KHGL_Customer");            ArrayList myArraylist = new ArrayList();            for (int i = 0; i < ds.Tables[0].Rows.Count; i++)            {                myArraylist.Add(ds.Tables[0].Rows[0]["iCustomerId"]);            }            Session["Arry"] = myArraylist;            myconnection.Close();

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Session取出数据

C# code

 protected void Page_Load(object sender, EventArgs e)    {        ArrayList temp = new ArrayList();        temp = (ArrayList)Session["Array"];        for (int i = 0; i < temp.Count; i++)        {            Response.Write(temp[i].ToString ());        }    }错误提示Response.Write(temp[i].ToString ())[color=#FF0000]未将对象引用设置到对象的实例。[/color]

[解决办法]
建议在向Session存入数据前加个判断

C# code

da.Fill(ds, "KHGL_Customer");            ArrayList myArraylist = new ArrayList();            if(ds.Tables[0].Rows.Count > 0)//判断            {              for (int i = 0; i < ds.Tables[0].Rows.Count; i++)              {                myArraylist.Add(ds.Tables[0].Rows[0]["iCustomerId"]);              }            }
[解决办法]
  myconnection.Open();
           //详细内容分页
           SqlDataAdapter da = new SqlDataAdapter(mycommand);
           DataSet ds = new DataSet();
           da.Fill(ds, "KHGL_Customer");
           ArrayList myArraylist = new ArrayList();
           for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
           {
               myArraylist.Add(ds.Tables[0].Rows[0]["iCustomerId"]);
           }
           Session["Arry"] = myArraylist;//你存入Session["Arry"]            myconnection.Close();

取Session的时候  

protected void Page_Load(object sender, EventArgs e)
   {
       ArrayList temp = new ArrayList();
       temp = (ArrayList)Session["Array"]; //你取的Session["Array"]
      for (int i = 0; i < temp.Count; i++)
       {
           Response.Write(temp[i].ToString ());
       }
   }


楼主以后写程序还是仔细检查一下吧！
[解决办法]
lz向Sesson里存值写的是
Session["Arry"] = myArraylist;
从Sesson里取值写的是
ArrayList temp = new ArrayList();
temp = (ArrayList)Session["Array"];


Session["Arry"] 与 Session["Array"]是两个Session，key不同

给分吧