ASP.NET - Check if a WebControl contains server blocks?

Is there a way in code to determine if a Web control contains server blocks (other than, for example, parsing out the file, grabbing the contents of the tag, and scanning for <% ... %>)?

My reason for wanting this is because I have a lot of old Web forms that were designed without any regard whatsoever to HTML conformance. The header control (which is included on every page but is inside the body tag) contains the link tag referencing the site's main stylesheet. As long as the page's head tag does not contain server blocks, I can programmatically insert the link tag into Page.Controls.OfType(Of HtmlHead).First(), then set the visibility of the "bad" link tag to false.

Again, this is all legacy stuff (it's in 3.5 now, but most was written in the .NET 1.1 days), so changing everything over to use a master page is something for which I simply do not have the time and budget. Regardless, it would be nice to see the开发者_开发知识库 pages come up with the stylesheet pre-loaded, rather than having the browser begin rendering with no styling, then applying the stylesheet once it reaches the reference to it in the body.

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Seems like a silly work around but could you change the name of your CSS file so that when the legacy code goes to load, it can't find it?

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Although Mufasa entered his response as a comment, this question has been sitting unresolved too long. Therefore, I will surmise that the only solution is his -- to wrap it in a try/catch black.