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Old August 14th, 2008, 03:17 PM
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Default ASP.net - Object reference not set to an instance

Hello All,

I'm a relative newbie to asp.net and am having an issue that is getting frustrating. I have page that has an Infragistics UltraWebGrid on it. One of the columns on the grid has a dropdown list. On initial load, it all works great, but on post back I get :Object reference not set to an instance of an object. I put a trace on and can see that it is throwing an "Unhandled Execution Error" at this line:
 at Infragistics.WebUI.UltraWebGrid.UltraGridBand.Syst em.Web.UI.IStateManager.LoadViewState(Object savedState)
Here is the code that seems to be the offender:

       Dim UnitsCmbAdapt As New SqlDataAdapter(GetMeasureUnits, dbProcurement_DevConnectionString)
        Dim UnitsCmbTable As New DataTable("UnitsCombo")
        Dim UnitsRow As DataRow
        Dim ds As New DataSet
        Dim UnitsValuelist As New Infragistics.WebUI.UltraWebGrid.ValueList()

        If Not IsPostBack() Then
            For Each UnitsRow In UnitsCmbTable.Rows
                UltraWebGrid1.DisplayLayout.Bands(0).Columns(2).ValueList = UnitsValuelist
            UltraWebGrid1.DisplayLayout.CellClickActionDefault = Infragistics.WebUI.UltraWebGrid.CellClickAction.Edit

        End If
I need the "ViewState" set to true as I need to hold the values of some of the form controls. I've spent a lot of time looking into this and think that I am not instantiating something correctly - but I'm not sure. I did not post this on the Infragistics forums as I don't believe the grid is the issue itself.

I truly appreciate any help you can give!


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Old August 30th, 2008, 09:25 AM
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you can check demo code of infragistic

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