[Mono-list] RE: ASP.NET object troubles.

[Raul Carolus]

Gonzalo Paniagua Javier wrote:


 >> On Sun, 2004-12-12 at 12:28 -0600, Raul Carolus wrote:
 >>
 >
 >>>>Greetings all.
 >>>>
 >>>>I have a aspx, with codebehind, that i'm trying to get tabcontrol-like
 >>>>behavior on.  I have everything working, except for the visual effects
 >>>>to determine what tab is selected.
 >>>>
 >>>>I'm using buttons as the tabs, and setting their CssClass to indicate
 >>>>whether the button is selected or not.  I use a Session variable to
 >>>>store what button is selected.
 >
 >>
 >>
 >> Using Session is not the most appropiate for that. You can also take a
 >> look at how this is done in xsp/test/tabcontrol2.aspx.


Yeah, probably not.  view state is probably better.  I'm just trying to
get it to work.  I'll take a look at the example.


 >>
 >>
 >
 >>>>However, when the page loads or does a postback,  I'm always getting
 >>>>null references when working with the buttons.
 >
 >>
 >>
 >> It would help if we can also see the stack traces you're getting.


Ok, here it is - I get it when the page loads.
System.NullReferenceException: Object reference not set to an instance
of an object
in <0x00045> StudentsPage:Page_Load (object,System.EventArgs)
in <0x00069> (wrapper delegate-invoke)
System.MulticastDelegate:invoke_void_object_EventArgs
(object,System.EventArgs)
in <0x00086> System.Web.UI.Control:OnLoad (System.EventArgs)
in <0x00024> System.Web.UI.Control:LoadRecursive ()
in <0x00198> System.Web.UI.Page:InternalProcessRequest ()
in <0x000c2> System.Web.UI.Page:ProcessRequest (System.Web.HttpContext)
in <0x002eb> ExecuteHandlerState:Execute ()
in <0x00084> StateMachine:ExecuteState
(System.Web.HttpApplication/IStateHandler,bool&)




 >>
 >> -Gonzalo
 >>
 >>
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