Hi,

I am using a templatecolumn with checkbox inside webdatagrid. And for one of the boundcolumns i am setting a dropdown editor provider. But i get HttpException error: Failed to load ViewState, when i do a virtualscroll.

  <Columns>
                                    <ig:TemplateDataField Key="checkField" Width="50px">
                                        <HeaderTemplate>
                                            <div style="text-align: center;">
                                                <input type="checkbox" onclick="selectFirstColumn(event);" /></div>
                                        </HeaderTemplate>
                                        <ItemTemplate>
                                            <div style="text-align: center;">
                                                <asp:CheckBox runat="server" ID="key_" /></div>
                                        </ItemTemplate>
                                    </ig:TemplateDataField>
                                    <ig:BoundDataField DataFieldName="Branch" Key="Branch">
                                        <Header Text="Branch" />
                                    </ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="Account" Key="Account">
                                        <Header Text="Account" />
                                    </ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="Description" Key="Description">
                                        <Header Text="Description" />
                                    </ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="MISGroup" Key="MISGroup">
                                        <Header Text="MISGroup" />
                                    </ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="SkCCY" Key="SkCCY">
                                        <Header Text="SkCCY" />
                                    </ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="SkBase" Key="SkBase">
                                        <Header Text="SkBase" />
                                    </ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="Syncstatus" Key="Syncstatus">
                                        <Header Text="Syncstatus" />
                                    </ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="AccountName" Key="AccountName">
                                        <Header Text="AccountName" />
                                    </ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="AccountTypeName" Key="AccountTypeID">
                                        <Header Text="AccountTypeName" />
                                    </ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="DateImported" Key="DateImported">
                                        <Header Text="DateImported" />
                                    </ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="ID" Key="ID" Hidden="true">
                                        <Header Text="ID" />
                                    </ig:BoundDataField>
                                    <ig:BoundDataField DataFieldName="AccountID" Key="AccountID" Hidden="true">
                                        <Header Text="AccountID" />
                                    </ig:BoundDataField>
                                </Columns>
                                <Behaviors>
                                    <ig:ColumnResizing Enabled="true" />
                                    <ig:Sorting SortingMode="Single" Enabled="true" />
                                    <ig:VirtualScrolling Enabled="true" ScrollingMode="Virtual" DataFetchDelay="300"
                                        RowCacheFactor="1" ThresholdFactor=".25">
                                    </ig:VirtualScrolling>
                                    <ig:Selection ColumnSelectType="Single" Enabled="true" />
                                    <ig:Filtering Alignment="Top" Visibility="Visible" Enabled="true" AnimationEnabled="true" />
                                    <ig:EditingCore>
                                        <Behaviors>
                                            <ig:CellEditing Enabled="true">
                                                <ColumnSettings>
                                                    <ig:EditingColumnSetting ColumnKey="AccountTypeID" EditorID="AccountsTypeNameProvider" />
                                                    <ig:EditingColumnSetting ColumnKey="DateImported" ReadOnly="true" />
                                                </ColumnSettings>
                                 
                                            </ig:CellEditing>
                                        </Behaviors>
                                    </ig:EditingCore>
                                </Behaviors>
                                <ClientEvents Initialize="intializeGrid" />
                                <EditorProviders>
                                    <ig:DropDownProvider ID="AccountsTypeNameProvider">
                                        <EditorControl ID="EditorControl1" runat="server" DisplayMode="DropDownList" DataSourceID="sqldsAccountTypes"
                                            TextField="AccountTypeName" ValueField="AccountTypeID" />
                                    </ig:DropDownProvider>
                                </EditorProviders>