authentication - How to authenticate by using windows credentials in c# web application under form authenticate mode -

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i developing web application , application must satisfy these requirement:

the application need support authentication active directory , sql membership provider. if logged-in window account of actor window account existed in database, system show homepage , not show login form. otherwise, system shows login form user enter username , password login.

the problem here is: can't windows account (username/ password) , base on username, check against database continue show homepage or show login page. how can username , password?

notice in iis, system configured under form authentication, not windows authentication.

web.config: 

<authentication mode="forms">

i tries such : windowsidentity.getcurrent(). environment.name, ... doesn't work.

could please help?

great thanks.

providing link..hope http://www.codeproject.com/articles/94612/windows-authentication


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