[Solved] Error when trying to ajaxify templated GridView buttons

[Ron Cirka]

I am trying to ajaxify links in a gridview. When I add the OnItemCreated event hander, I get the error:

Collection was modified; enumeration operation may not execute.

I have predefined AjaxSettings in the RadAjaxManager. I found that if I remove them, I don't get the error. Shouldn't it be possible to have defined ajax settings as well as dynamically added them in code behind?

protected void uxGrid_OnItemCreated(object sender, GridItemEventArgs e)
    {
        if (e.Item is GridDataItem)
        {
            GridDataItem item = (GridDataItem)e.Item;
            LinkButton lnkAddParticipant = (LinkButton)item["TemplateColumn"].FindControl("lnkAddParticipant");
            RadAjaxManager1.AjaxSettings.AddAjaxSetting(lnkAddParticipant, uxGrid, null);
        }
    }

This works:

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" OnAjaxRequest="RadAjaxManager1_AjaxRequest">
        <AjaxSettings>
</AjaxSettings>
    </telerik:RadAjaxManager>

This doesn't work:

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" OnAjaxRequest="RadAjaxManager1_AjaxRequest">
        <AjaxSettings>
            <telerik:AjaxSetting AjaxControlID="btnLoadRooms">
                <UpdatedControls>
                    <telerik:AjaxUpdatedControl ControlID="uxGrid" />
                </UpdatedControls>
            </telerik:AjaxSetting>
</AjaxSettings>
    </telerik:RadAjaxManager>

[Pavlina]

Hello Ron,

It is not suggested practice to ajaxify only a link button which is in any GridColumn. To achieve the desired functionality you should ajaxify the whole RadGrid or the parent that hold it. For example:  
RadAjaxManager1.AjaxSettings.AddAjaxSetting(uxGrid, uxGrid, null);

Please give this suggestion a try and let me know if it works for you.

Regards,
Pavlina
the Telerik team

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[Ron Cirka]

Unfortunately if I ajax the whole grid, it causes an ajax error when updating a component I built. I changed the functionality on the grid to work around, so it's no longer an issue.