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Use OnNeedDataSource of Radgrid inside UserControl

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This is a migrated thread and some comments may be shown as answers.
Basel
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Basel asked on 17 Feb 2017, 08:42 PM

I have aspx page that use a Radgrid to display list of records,
During Editing command of the record, I am loading dynamically usercontrol "Record_Details.ascx" to display the record details using another Radgrid control "Record_Grid".

For that I am using OnNeedDataSource="RecoredRadGrid_OnNeedDataSource" event handler to load Record_Grid inside the usercontrol by passing the record ID from the RadGrid on the aspx page,

an error message is showing :"The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases"

Stack Trace: 

[HttpException (0x80004005): The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.] System.Web.UI.ControlCollection.Add(Control child) +11827274 Telerik.Web.UI.RadAjaxControl.CreateUpdatePanel(Control initiator, String eventName, Control updated, UpdatePanelRenderMode panelRenderMode, Unit panelHeight, String panelCssClass) +1935 Telerik.Web.UI.RadAjaxControl.OnPagePreRender(Object sender, EventArgs e) +3883 System.EventHandler.Invoke(Object sender, EventArgs e) +0 System.Web.UI.Control.OnPreRender(EventArgs e) +11897165 System.Web.UI.Control.PreRenderRecursiveInternal() +107 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +7675

I could find solution/workaorund to this issue by removing OnNeedDataSource of "Record_Grid" inside Record_Details.ascx , and load the datasource during ItemDataBound event handler of the Records RadGrid in .aspx page.

My question is why I am not able to use "OnNeedDataSource="RecoredRadGrid_OnNeedDataSource" to load the "Record_Grid" data from inside the Usercontrol, and error thrown each time I used it.

No answers yet. Maybe you can help?

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