Convert code from vb to c#...

I am trying to get a user's login credentials and then go into AD and get their "Full Name".  I found some sample code and it was in vb and i was hoping to convert it to C# since that is what the rest of the project is being written in.  Here is the line I am getting stuck on:
 
Dim DomainUser As String = System.Security.Principal.WindowsIdentity.GetCurrent.Name.Replace("\", "/")

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