Good day,

I have a webdatagrid on my page and have a datasource for it as object list. The code is like this:

        private List<AccommodationPrio> GetPrioritiesSelectionData()
        {
            GoGoYield_Entities entities = Master.GetEntities();
            int? intBrandId = (int?)GetSelectedBrandId();

            List<AccommodationPrio> result = (List<AccommodationPrio>)Session["AccommodationPrios"];

            if (result == null)
            {
                System.Linq.IOrderedQueryable<AccommodationPrio> query = Master.GetEntities().AccommodationPrios.OrderBy(p => p.Priority.Value); //.Include("Accommodation")
                result = query.ToList();
                Session["AccommodationPrios"] = result;
            }

            return result;
        }

and the aspx:

<ig:WebDataGrid ID="wdgPriorities" runat="server" AutoCRUD="true" AutoGenerateColumns="False" DataKeyFields="BrandId,AccommodationId"
                        CssClass="margin1pct" Width="98%" OnLoad="wdgPriorities_onLoad"
                        Height="650px"
                        oninitializerow="wdgPriorities_InitializeRow">
                        <Behaviors>
                            <ig:Filtering AnimationEnabled="True">
                            </ig:Filtering>
                            <ig:ColumnResizing Enabled="true">
                                <ColumnSettings>
                                    <ig:ColumnResizeSetting EnableResize="true" />
                                </ColumnSettings>
                            </ig:ColumnResizing>
                            <ig:EditingCore>
                                <Behaviors>
                                    <ig:CellEditing>
                                        <EditModeActions EnableOnActive="True" EnableOnKeyPress="True"
                                            MouseClick="Single" />
                                        <ColumnSettings>
                                            <ig:EditingColumnSetting ColumnKey="Priority" ReadOnly="true" />
                                        </ColumnSettings> 
                                    </ig:CellEditing>
                                </Behaviors>
                            </ig:EditingCore>
                        </Behaviors>
                    </ig:WebDataGrid>

When applying a filter on one of the colums the first time it works fine. The second time i apply the same (or other) filter on a column it results in the following error:

[NullReferenceException: Object reference not set to an instance of an object.] Infragistics.Web.UI.GridControls.JsTypeResolver.ResolveTypeId(Type type) +887 Infragistics.Web.UI.GridControls.ColumnFilter.set_ColumnKey(String value) +576 Infragistics.Web.UI.GridControls.ColumnFilter.LoadViewState(Object savedState) +189 Infragistics.Web.UI.Framework.ObjectBase.System.Web.UI.IStateManager.LoadViewState(Object state) +39 Infragistics.Web.UI.Framework.ObjectCollection.LoadViewStateItems(ArrayList itemList) +331 Infragistics.Web.UI.Framework.ObjectCollection.LoadViewState(Object savedState) +219 Infragistics.Web.UI.Framework.ObjectCollection.System.Web.UI.IStateManager.LoadViewState(Object savedState) +39 Infragistics.Web.UI.GridControls.Filtering.LoadViewState(Object savedState) +171 Infragistics.Web.UI.Framework.ObjectBase.System.Web.UI.IStateManager.LoadViewState(Object state) +39 Infragistics.Web.UI.Framework.ObjectCollection.LoadViewStateItems(ArrayList itemList) +331 Infragistics.Web.UI.Framework.ObjectCollection.LoadViewState(Object savedState) +219 Infragistics.Web.UI.Framework.ObjectCollection.System.Web.UI.IStateManager.LoadViewState(Object savedState) +39 Infragistics.Web.UI.GridControls.WebDataGrid.LoadViewState(Object savedState) +645 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +187 System.Web.UI.Control.LoadChildViewStateByID(ArrayList childState) +130 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +239 System.Web.UI.Control.AddedControl(Control control, Int32 index) +8901358 System.Web.UI.ControlCollection.Add(Control child) +79 Infragistics.Web.UI.LayoutControls.AJAXContentPane.InstantiateTemplate(Boolean ajax, Boolean dynamicUP, String triggerID, Boolean loadContent) +1572 Infragistics.Web.UI.LayoutControls.WebTab.InstantiateTemplates() +1181 Infragistics.Web.UI.LayoutControls.WebTab.CreateChildControls() +56 System.Web.UI.Control.EnsureChildControls() +102 System.Web.UI.Control.FindControl(String id, Int32 pathOffset) +20 System.Web.UI.Control.FindControl(String id, Int32 pathOffset) +365 System.Web.UI.Control.FindControl(String id, Int32 pathOffset) +365 System.Web.UI.Control.FindControl(String id, Int32 pathOffset) +365 System.Web.UI.Page.FindControl(String id) +38 System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +287 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +878

I have NetAdvantage 2010.2.

Do you have any ideas?

regards,

      René