“/”应用程序中的服务器错误。

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行 28:         if (pid == 0)
行 29:         {
行 30:             id = int.Parse(Request.QueryString["id"].ToString());
行 31: 
行 32:             mds = mdb.GetDs("SELECT * FROM product WHERE product5=" + id + "");

[NullReferenceException: 未将对象引用设置到对象的实例。]
   productshows.Page_Load(Object sender, EventArgs e) in d:\webs\jhxl\wwwroot\productshowsxl.aspx.cs:30
   System.Web.UI.Control.OnLoad(EventArgs e) +107
   System.Web.UI.Control.LoadRecursive() +89
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1532