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How to get Full Name from AD/LDAP?

Posted By:      Posted Date: April 10, 2011    Points: 0   Category :Windows Application
Is there anyway I can get the full name of the user that's logged in. I am able to get the username of the logged in person, but not full-name. Also, it seems I am only able to get username of person in child pages. I need to get username in my master page for something, but it won't work, saying user doesn't exist in current context even though I imported all objects that I have for my child pages where this same code works. Can someone tell me what I am doing wrong? Or does it not work in Master Page (which I don't see why)?
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Security.Principal;
using System.Web.Security;

FormsIdentity id = (FormsIdentity)User.Identity;
            FormsAuthenticationTicket ticket = id.Ticket;

myLabel.InnerHtml = ("Hello, " + Server.HtmlEncode(User.Identity.Name));
Also, this other one works in Master Page but returns domain/username but I only want username:

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