в System.Data.RBTree`1.GetNodeByIndex(Int32 userIndex)
   в System.Data.DataRowCollection.get_Item(Int32 index)
   в Sites_apps_contract.Mode_Viewcontractisp(WebModuleParams wmp) в d:\InetPub\NET_SANDBOX\Sites\apps.mineralogy.ru\contract.ascx.cs:строка 6327

   в System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   в System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   в System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
   в Imin.Web.CoreModules.WebModuleCustom.OnLoad(EventArgs e)