Applying Thems To Whole Page or Apllication

Reference from
http://www.15seconds.com/issue/040105.htm
http://www.beansoftware.com/ASP.NET-Tutorials/CSS-ASP.NET.aspx
http://msdn.microsoft.com/en-us/library/240ww6sz%28v=VS.80%29.aspx 

in asp.net******
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http://www.aspdotnet-suresh.com/2011/10/how-to-change-page-theme-dynamically-in.html