“/”应用程序中的服务器错误。

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[NullReferenceException: 未将对象引用设置到对象的实例。]
   BookShop.WebForm1.BindData() in F:\Work\ASPNET-Sample\ASPNET\BookShop\BookShop\Main.aspx.cs:49
   BookShop.WebForm1.Page_Load(Object sender, EventArgs e) in F:\Work\ASPNET-Sample\ASPNET\BookShop\BookShop\Main.aspx.cs:31
   System.Web.UI.Control.OnLoad(EventArgs e) +67
   System.Web.UI.Control.LoadRecursive() +35
   System.Web.UI.Page.ProcessRequestMain() +731