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WebformsMVP

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Documentation and Tutorials

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4 Answers, 1 is accepted

answered on 09 Sep 2010, 08:04 PM

I downloaded the app. It is not working. It is unable to load the entities.

Anyway, I am working on a new project with Telerik controls using WebformsMVP. I am getting below error. Any idea how to fix this.

RegisterRequiresControlState can only be called before and during PreRender.

[InvalidOperationException: RegisterRequiresControlState can only be called before and during PreRender.]
   System.Web.UI.Page.RegisterRequiresControlState(Control control) +2766830
   System.Web.UI.Control.AddedControl(Control control, Int32 index) +8901268
   System.Web.UI.ControlCollection.Add(Control child) +79
   Telerik.Web.UI.RadGrid.CreateChildControls(IEnumerable dataSource, Boolean dataBinding) +361
   System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data) +66
   System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) +128
   System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +33
   System.Web.UI.WebControls.DataBoundControl.PerformSelect() +143
   System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +74
   Telerik.Web.UI.RadGrid.DataBind() +89
   System.Web.UI.Control.DataBindChildren() +201
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +101
   System.Web.UI.Control.DataBind() +15
   System.Web.UI.Control.DataBindChildren() +201
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +101
   System.Web.UI.Control.DataBind() +15
   System.Web.UI.Control.DataBindChildren() +201
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +101
   System.Web.UI.Control.DataBind() +15
   System.Web.UI.Control.DataBindChildren() +201
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +101
   System.Web.UI.Control.DataBind() +15
   System.Web.UI.Control.DataBindChildren() +201
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +101
   System.Web.UI.Control.DataBind() +15
   System.Web.UI.Control.DataBindChildren() +201
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +101
   System.Web.UI.Control.DataBind() +15
   System.Web.UI.Control.DataBindChildren() +201
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +101
   System.Web.UI.Control.DataBind() +15
   System.Web.UI.Control.DataBindChildren() +201
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +101
   System.Web.UI.Control.DataBind() +15
   WebFormsMvp.Web.<>c__DisplayClassa`1.<Register>b__9(Object sender, EventArgs e) +39
   System.EventHandler.Invoke(Object sender, EventArgs e) +0
   System.Web.UI.Page.OnPreRenderComplete(EventArgs e) +8872106
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2716

answered on 10 Sep 2010, 06:54 AM

Hi Adam,

I suspect that the cause for the error you are getting is the way MvpUserControl is implemented. As you may know the class exposes an AutoDataBind property, which by default will cause a call to DataBind on PreRenderComplete event. However, this will eventually recreate all databound controls too late in the page's lifecycle. Therefore, could you set AutoDataBind property to false (inside UserControl's constructor) and see if this makes any difference in the observed behavior.

Best wishes,
Rosen
the Telerik team

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