Cannot Load View State when edit form is opened

[Lasly]

Hi,

I've problem with my radgrid.

My page add columns to Radgrid at runtime mode.

I've fired the Page_Init event and i'm able to add columns.

After edit or insert a record into my ragrid, if I don't close the edit form and do a postback with another control (in this case a RadTab control), who a different datasource (with more or less columns) my page catch an exception: "unable to load view state".

If I close the edit form page works correctly.

How can I resolve this problem?

<telerik:RadAjaxPanel ID="pnlElenco" runat="server" Height="100%" Width="100%">
                    <asp:Label ID="lblStato" runat="server" Width="100%" CssClass="statusbar_silver" />
                    <telerik:RadGrid ID="grdElenco" runat="server" AutoGenerateColumns="true" Width="100%"
                        AllowAutomaticUpdates="true" AllowAutomaticDeletes="true" AllowAutomaticInserts="true"
                        OnInsertCommand="OnInsertCommand" OnUpdateCommand="OnUpdateCommand" OnDeleteCommand="OnDeleteCommand"
                        OnNeedDataSource="NeedDataSource" Skin="Default" PageSize="15" OnColumnCreated="OnColumnCreated">
                        <PagerStyle AlwaysVisible="false" Mode="NextPrev" />
                        <ExportSettings ExportOnlyData="true" HideStructureColumns="true" IgnorePaging="false">
                            <Excel Format="ExcelML" />
                        </ExportSettings>
                        <MasterTableView AllowPaging="true" ShowHeadersWhenNoRecords="true"
                            CommandItemDisplay="Top" EditMode="InPlace" EnableColumnsViewState="false">
                            <Columns>
                                <telerik:GridEditCommandColumn HeaderStyle-Width="40" ButtonType="ImageButton" UniqueName="EditCommandColumn"
                                    EditText="Modifica">
                                    <ItemStyle HorizontalAlign="Center" />
                                </telerik:GridEditCommandColumn>
                                <telerik:GridButtonColumn ConfirmText="Eliminare questo record in maniera definitiva?"
                                    ConfirmDialogType="RadWindow" ConfirmTitle="Delete" ButtonType="ImageButton"
                                    CommandName="Delete" Text="Elimina" UniqueName="DeleteColumn">
                                    <ItemStyle HorizontalAlign="Center" Width="40" />
                                </telerik:GridButtonColumn>
                            </Columns>
                            <CommandItemSettings ShowExportToExcelButton="true" />
                        </MasterTableView>
                    </telerik:RadGrid>
                    <asp:HiddenField ID="txtCurrentTable" runat="server" />
                </telerik:RadAjaxPanel>

Regards!

Cristian

[Tsvetina]

Hi Martini,

When you dynamically create the columns of a statically declared grid, you should do that in Page_Load since the ViewState is not yet available in Page_Init. See this help article and more specifically the example relevant to your scenario:

Dynamically defining the structure of a statically-declared grid

Additionally, RadGrid does not support having dynamically and statically created columns at the same time, so you would need to also create the button column and edit command column dynamically.

Best wishes,
Tsvetina
the Telerik team