protected void ShowImage(int ID,string str)            //显示图片
    {
        //页面传值！！！

        ArrayList params1 = new ArrayList();
        params1.Add(ID);
        params1.Add(str);
       

        string keyId = params1.GetHashCode().ToString();
        Cache.Insert(keyId, params1);
        ShowImg.ImageUrl = "Image.aspx?param=" + keyId;

    }
获取:
 //获取上个页面传来的值
        ArrayList p = (ArrayList)Cache[Request.QueryString["param"]];     
        int intMapID = int.Parse(p[0].ToString());
        string strCoor = p[1].ToString();
        string[] str = strCoor.Split(',');