[Mono-list] RE: ASP.NET object troubles.
Sun, 12 Dec 2004 16:51:29 -0600
Gonzalo Paniagua Javier wrote:
>> On Sun, 2004-12-12 at 12:28 -0600, Raul Carolus wrote:
>>>>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)
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
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