“/”应用程序中的服务器错误。

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行 30:         if (Request.QueryString["lid"] != null || Request.QueryString["lid"] != "")
行 31:         {
行 32:             DataSet ds = DbHelperSQL.Query("select * from sear_development where id=" + Convert.ToInt32(Request.QueryString["lid"].ToString()) + "");
行 33:             if (ds.Tables[0].Rows.Count > 0)
行 34:             {

[NullReferenceException: 未将对象引用设置到对象的实例。]
   about.bindaboutus() in e:\guest\blowingmachine.cc\about.aspx.cs:32
   about.Page_Load(Object sender, EventArgs e) in e:\guest\blowingmachine.cc\about.aspx.cs:23
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +24
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +41
   System.Web.UI.Control.OnLoad(EventArgs e) +131
   System.Web.UI.Control.LoadRecursive() +65
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2427