在ASP.NET应用程序中使用身份模拟（Impersonation）

http://www.cnblogs.com/drw/articles/17946.html
1． INFO: Implementing Impersonation in an ASP.NET Application

http://support.microsoft.com/default.aspx?scid=kb;en-us;Q306158&SD=MSKB

2． INFO: ASP.NET Security Overview

http://support.microsoft.com/default.aspx?scid=kb;en-us;Q306590

3． ASP.NET Web Application Security

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconaspnetwebapplicationsecurity.asp