Hi,

On my sample web form i am using webgrid and webcombo and webcombo is bind to one of the grid column. I am using updatecell event of an ASP.NET grid to update values to DB. I have upgraded my control's to Infragistics 9.1 for CLR 2.0 from 7.3. The code behind updatecell was working fine for 7.3 but  after upgrade i am getting the following error message every time i call the event. I debug though all lines but i am not getting any error.

Error

 Server Error in '/' Application.

[NullReferenceException: Object reference not set to an instance of an object.]
   Infragistics.WebUI.UltraWebGrid.UltraWebGrid.UpdateDBRow(UltraGridRow row, UltraGridRow oldRow) +236
   Infragistics.WebUI.UltraWebGrid.UltraWebGrid.ProcessChanges(StateChanges stateChanges, Boolean fireEvents) +1560
   Infragistics.WebUI.UltraWebGrid.UltraWebGrid.RaisePostDataChangedEvent() +161
   System.Web.UI.Page.RaiseChangedEvents() +165
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1485

Object reference not set to an instance of an object.

My code File

Public Partial Class TestCombo
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Try
          
            If Page.IsPostBack = False Then
                Dim dtcity As New DataTable
                dtcity.Columns.Add("CityId", GetType(Int16))
                dtcity.Columns.Add("City", GetType(String))

                dtcity.Rows.Add(New Object() {1, "Nuneaton"})
                dtcity.Rows.Add(New Object() {2, "London"})
                dtcity.Rows.Add(New Object() {3, "Coventry"})

                WebCombo1.DataSource = dtcity
                WebCombo1.DataTextField = "City"
                WebCombo1.DataValueField = "CityId"

                setGrid(1)

            End If

            WebCombo1.Columns(0).Hidden = True

        Catch ex As System.Exception
            Response.Write(ex.Message)
        End Try
    End Sub

    Private Sub setGrid(ByVal cityVal As Int16)
        Try
            Dim dt As New DataTable

            dt.Columns.Add("Name", GetType(String))
            dt.Columns.Add("City", GetType(Int16))

            dt.Rows.Add(New Object() {"Test name", cityVal})

            UltraWebGrid1.DataSource = dt
            UltraWebGrid1.DataBind()

        Catch ex As System.Exception
            Throw ex
        End Try
    End Sub

    Private Sub UltraWebGrid1_InitializeLayout(ByVal sender As Object, ByVal e As Infragistics.WebUI.UltraWebGrid.LayoutEventArgs) Handles UltraWebGrid1.InitializeLayout
        Try
            With e.Layout.Bands(0)

                .Columns(.Columns.FromKey("City").Index).Type = Infragistics.WebUI.UltraWebGrid.ColumnType.DropDownList
                .Columns(.Columns.FromKey("City").Index).ValueList.WebCombo = WebCombo1

            End With
        Catch ex As System.Exception
            Response.Write(ex.Message)
        End Try
    End Sub

    Private Sub UltraWebGrid1_UpdateCell(ByVal sender As Object, ByVal e As Infragistics.WebUI.UltraWebGrid.CellEventArgs) Handles UltraWebGrid1.UpdateCell
        Try
            setGrid(e.Cell.Row.Cells(1).Value)
        Catch ex As System.Exception
            Response.Write(ex.Message)
        End Try
    End Sub

End Class