How should I check if a user is authenticated in MVC5?

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There’s no difference. The only difference is that if the user is not authenticated User.Identity might be null and thus you might get a NRE, whereas with the second approach, internally there’s a check for this and is safer.

Here’s how the Request.IsAuthenticated method is implemented:

public bool IsAuthenticated
{
    get
    {
        return this._context.User != null && 
               this._context.User.Identity != null &&
               this._context.User.Identity.IsAuthenticated;
    }
}

Basically it’s a bit safer than the first one.

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