Hi,

i have a problem using AJAX with the WebDataGrid in a SharePoint 2010 Visual WebPart. The Page will come up without any Problem. But if there is an asynchronous refresh e.g. if using the filter or the paging behavior i will get the following error message:

The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>)

My Code (ASPX):

<%@ Register Assembly="Infragistics35.Web.v10.1, Version=10.1.20101.2134, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" TagPrefix="igtbl" Namespace="Infragistics.Web.UI.GridControls" %>
<%@ Register Assembly="Infragistics35.Web.v10.1, Version=10.1.20101.2134, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" TagPrefix="ig" Namespace="Infragistics.Web.UI.ListControls" %>
<%@ Register Assembly="Infragistics35.Web.v10.1, Version=10.1.20101.2134, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" TagPrefix="igsch" Namespace="Infragistics.Web.UI.EditorControls" %>
    <div id="container" runat="server">
            <div id="DataGridWrapper">
                <igtbl:WebDataGrid ID="WebDataGrid1" runat="server" Height="500px" Width="800px" AutoGenerateColumns="False"  EnableAjax="true" EnableViewState="false" EnableDataViewState="false" ClientEvents-AJAXResponse="277A67FD-9934-432E-9D76-BF48862DE8DD">
                    <Columns>
                        <igtbl:BoundDataField DataFieldName="USER_ID" Key="USER_ID">
                            <Header Text="CWID" />
                        </igtbl:BoundDataField>
                        <igtbl:BoundDataField DataFieldName="FULL_NAME" Key="FULL_NAME" Width="150px">
                            <Header Text="Name" />
                        </igtbl:BoundDataField>
                        <igtbl:BoundDataField Key="PLANNED_DATE">
                            <Header Text="Planned Date" />
                        </igtbl:BoundDataField>
                    </Columns>
                    <Behaviors>
                        <igtbl:Paging PageSize="100" PagerAppearance="Bottom" Enabled="true"/>
                        <igtbl:Filtering Enabled="true"  AnimationEnabled="false"/>
                        <igtbl:RowSelectors Enabled="true"/>
                        <igtbl:Selection CellSelectType="Single" RowSelectType="Multiple" ColumnSelectType="Multiple" Enabled="true" />
                      </Behaviors>
                </igtbl:WebDataGrid>
            </div>
        </div> 

Code behind:

      protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);
            try
            {

                SPSecurity.RunWithElevatedPrivileges(delegate
                {
                    UserService userService = new UserService(ServerAndInstance, Database);
                    WebDataGrid1.DataSource = userService.GetTopUsers();
                    WebDataGrid1.DataBind();
                });
            }
            catch (Exception)
            {
                throw new ApplicationException(WebDataGrid1.EmptyRowsTemplate.ToString());

            }
        }

WebPartCode:

      protected override void CreateChildControls()
        {
            
            UserControl uc =
                (UserControl)Page.LoadControl(_ascxPath);
            UserControl.Database = databaseName;
            UserControl.ServerAndInstance = SQLServer;

            Controls.Add(UserControl);

        }

 For additional information:

I'm using the default SharePoint 2010 Design with the v4.master MasterPage.

Can someboy help?