Server Error in '/Calendario-Personalizado' 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 35:         ArrayList lista = (ArrayList)Session["Cesto"];
Line 36: 
Line 37:         foreach (Cesto itens in lista)
Line 38:         {
Line 39:             if (itens.item.IndexOf("caderno") == -1 && itens.item.IndexOf("Mini") == -1) //não achou caderno, nem mini calendário

Source File: c:\inetpub\vhosts\compulaserg.com.br\wwwroot\Calendario-Personalizado\Mostra-box.aspx.cs    Line: 37

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   Mostra_box.preencheGrid() in c:\inetpub\vhosts\compulaserg.com.br\wwwroot\Calendario-Personalizado\Mostra-box.aspx.cs:37
   Mostra_box.Page_Load(Object sender, EventArgs e) in c:\inetpub\vhosts\compulaserg.com.br\wwwroot\Calendario-Personalizado\Mostra-box.aspx.cs:20
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +95
   System.Web.UI.Control.LoadRecursive() +59
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.4087.0