Getting the GUID of the current user?

I want to add a user’s GUID in with the information I retrieve from a user when they submit a post. How can I get the GUID?

I am using the default authentication system that comes along with an ASP.NET MVC application.


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Method 1

If you are using the ASP.NET Membership provider:

MembershipUser user = Membership.GetUser(User.Identity.Name);
Guid guid = (Guid)user.ProviderUserKey;

or simply:
Guid guid = (Guid)Membership.GetUser().ProviderUserKey;

Method 2

You could simply use the username instead of hitting the database for something like this:

public ActionResult PostComment()
    var username = User.Identity.Name;
    // Here you know the user trying to post a comment

Method 3

Hi there is a MVC use of the Membership example, with explanation in this blog. It shows how you can get the membership information of current logged in user.

Method 4

This is how to get the user guid from the user name:

Guid userGuid = (Guid)Membership.GetUser(user.Username).ProviderUserKey;

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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