Use OnNeedDataSource of Radgrid inside UserControl

1 posts, 0 answers
  1. Basel
    Basel avatar
    1 posts
    Member since:
    Feb 2015

    Posted 17 Feb 2017 Link to this post

    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.

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