Server Error in '/' Application.

Cannot find column [a_position].

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.Data.EvaluateException: Cannot find column [a_position].

Source Error:


Line 84: 
Line 85: 
Line 86:         DataRow[] _drs = _dt.Select("a_position=" + this._position);
Line 87:         string _result = "";
Line 88:         if (_drs.Length!= 0) 

Source File: d:\web\TS.WebSite\usercontrol\control\ad.ascx.cs    Line: 86

Stack Trace:


[EvaluateException: Cannot find column [a_position].]
   System.Data.NameNode.Bind(DataTable table, List`1 list) +2230022
   System.Data.BinaryNode.Bind(DataTable table, List`1 list) +49
   System.Data.DataExpression.Bind(DataTable table) +118
   System.Data.DataTable.Select(String filterExpression) +231
   usercontrol_control_ad.pageBind() in d:\web\TS.WebSite\usercontrol\control\ad.ascx.cs:86
   usercontrol_control_ad.Page_Load(Object sender, EventArgs e) in d:\web\TS.WebSite\usercontrol\control\ad.ascx.cs:108
   System.Web.UI.Control.LoadRecursive() +71
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3178


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34209