Server Error in '/web' 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 42:         dt = db.SelectSqlDataTable(sql)
Line 43:         db.Close()
Line 44:         dtr = dt.CreateDataReader()
Line 45:         Return dtr
Line 46:     End Function

Source File: D:\web\web\App_Code\DatabaseHelper.vb    Line: 44

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   DatabaseHelper.getDataTableReaderDottorato(String sql) in D:\web\web\App_Code\DatabaseHelper.vb:44
   dottoratoHelper.OffertaErogataNewTitolo(String idDottorato, String lingua, String ciclo_numero) in D:\web\web\App_Code\dottoratoHelper.vb:409
   ASP.offertaformativaerogata_aspx.Page_Load(Object sender, EventArgs e) in D:\web\web\OffertaFormativaErogata.aspx:31
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +24
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +41
   System.Web.UI.Control.OnLoad(EventArgs e) +131
   System.Web.UI.Control.LoadRecursive() +65
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2427


Version Information: Microsoft .NET Framework Version:2.0.50727.9061; ASP.NET Version:2.0.50727.9062