Hi,

I'm having a problem populating a dropdownlist in a datagrid.

The example code I've found on the web use datasets to populate the dropdownlist, however I'm using a collection as below, I've also tried a datatable with the same result:

                                    <asp:TemplateColumn>
                                        <EditItemTemplate>
                                        <asp:DropDownList ID="ProdDDL" Runat=server DataTextField="Prod_Desc" OnSelectedIndexChanged="GetProdTaskData">
                                        </asp:DropDownList>
                                        </EditItemTemplate>
                                    </asp:TemplateColumn>

        Dim _PRCol As New FGFM.CollectionClasses.PRODUCTDATACollection

        filterPR.Add(PredicateFactory.CompareValue(FGFM.PRODUCTDATAFieldIndex.INCLUDE_GFM, ComparisonOperator.Equal, "Y"))
        'daoPR.GetMultiAsDataTable(fieldsPR, dtlPR, 0, sorterPR, filterPR, Nothing, True, Nothing, Nothing, 0, 0)
        _PRCol.GetMulti(filterPR)
        Dim cnt As Integer
        ' just to check that I'm getting the correct data
        cnt = _PRCol.Count()
        'PopulateProdList
        ProdDDL.DataSource = _PRCol
        ProdDDL.DataTextField = "Prod_Desc"
        ProdDDL.DataValueField = "Prod_Desc"
        ProdDDL.DataBind()

When I run it I get an exception System.NullReferenceException: Object reference not set to an instance of an object

Any help would be appreciated

Mike

is there any stack trace given?

The stack trace is:

Source Error: 


Line 459:       cnt = _PRCol.Count()
Line 460:       'PopulateProdList
Line 461:       ProdDDL.DataSource = _PRCol
Line 462:       ProdDDL.DataTextField = "Prod_Desc"
Line 463:       ProdDDL.DataValueField = "Prod_Desc"


Stack Trace: 

[NullReferenceException: Object reference not set to an instance of an object.]
   GFM.Task_new_work.PopulateProd() in C:\GFM\gfm\Task_new_work.aspx.vb:461
   GFM.Task_new_work.GetOrderTypes(Object sender, EventArgs e) in C:\GFM\gfm\Task_new_work.aspx.vb:419
   System.Web.UI.WebControls.ListControl.OnSelectedIndexChanged(EventArgs e) +108
   System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent() +26
   System.Web.UI.Page.RaiseChangedEvents() +115
   System.Web.UI.Page.ProcessRequestMain() +1099

I've tried putting the dropdownlist outside the datagris and it works ok, it's just when it's inside the datagrid

Thanks

Mike

if the exception is at line 461, ProdDDL is null.