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Editorial Team
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Asked: 2026-05-27T17:40:48+00:00

I have a .NET 4.0 Winforms app. I’d like to require the user to

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I have a .NET 4.0 Winforms app. I’d like to require the user to re-enter his/her login password before using a sensitive feature. This needs to work for users logged in through Active Directory and through Windows Networking.

So I need to pop up a dialog box that contains the username and password fields, and OK and Cancel buttons.

I’m looking to see if there is maybe a dialog box like this built into windows. If not, I can design my own dialog box.

I believe I can determine the username using WindowsIdentity.GetCurrent().Name . Looks like the way to authenticate is by creating a PrincipalContext and calling ValidateCredentials() on it. Before creating the PrincipalContext, I need to know whether the user is authenticated through AD or Windows Networking, so I can construct PrincipalContext correctly. Maybe there is some piece of code that wraps up all of this in a neat call?

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  1. Editorial Team

    Microsoft has an article which describes how you can validate Windows user rights at support.micosoft.com.

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