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Note: view the updated entry below:
http://www.codeasp.net/blogs/vivek_iit/microsoft.net/156/custom-page-directives-in-asp.net-2.0
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I came across this interesting post on how to extend the Page directives in ASP.NET 2.0 by Scott and though of sharing it. See the link for details:
http://weblogs.asp.net/scottgu/archive/2005/08/02/421405.aspx