Server Error in '/' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 64:                 //rep_ProClss.DataSource = dbcl;
Line 65:                 //rep_ProClss.DataBind();
Line 66:                 num = Request.QueryString["num"].ToString();
Line 67:                 DataSet dsto = part.SelectAllZTAll("Top_Table", " order by ID asc", " top 9");
Line 68:                 DataTable dbto = dsto.Tables[0];

Source File: d:\web\shmojue.com\Product.aspx.cs    Line: 66

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]
   Product.Page_Load(Object sender, EventArgs e) in d:\web\shmojue.com\Product.aspx.cs:66
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +91
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1