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

[Brian Mains]

hello,

I have two date/time pickers within the site details page.  It was working fine, but now I'm getting the error in my MVC view as shown below.  Again,  this is in a view and I have a RadScriptManager defined within the Site.Master master page.

Thanks.

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

[HttpException (0x80004005): The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).]
   System.Web.UI.ControlCollection.Add(Control child) +8677431
   Telerik.Web.SkinRegistrar.RegisterCssReference(Page _page, Control _control, String _url) +257

[HttpException (0x80004005): Please, see whether wrapping the code block, generating the exception, within RadCodeBlock resolves the error.]
   Telerik.Web.SkinRegistrar.RegisterCssReference(Page _page, Control _control, String _url) +305
   Telerik.Web.SkinRegistrar.RegisterCssReferences(ISkinnableControl _control) +435
   Telerik.Web.UI.RadWebControl.RegisterCssReferences() +51
   Telerik.Web.UI.RadWebControl.OnPreRender(EventArgs e) +53
   Telerik.Web.UI.RadInputControl.OnPreRender(EventArgs e) +12
   Telerik.Web.UI.RadDateInput.OnPreRender(EventArgs e) +288
   Telerik.Web.UI.DatePickingInput.OnPreRender(EventArgs e) +238
   System.Web.UI.Control.PreRenderRecursiveInternal() +80
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +842

It was working, but now I don't know why I'm getting the error?

[Iana Tsolova]

Hi Brian,

Try wrapping your client-code into a RadCodeBlock or RadScriptBlock control and see if it makes any difference.

Kind regards,
Iana
the Telerik team

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[Brian Mains]

Hello,

This wasn't JavaScript code; it was the actual RadComboBox itself; I didn't have any code (just used UI components).  So is there another option, or is there a reason for this happening?

Thanks.

[Georgi Krustev]

Hi Brian Mains,

Review the attached test project which shows how to render RadDatePicker.

Greetings,
Georgi Krustev
the Telerik team

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Watch a video on how to optimize your support resource searches and check out more tips on the blogs.

[Scott Rakestraw]

Would you use the same approach for a TreeView control?