AD password encrypted internally so except password rest of all user info you can get by using "PrincipalContext " class that will be available in System.DirectoryServices.
PrincipalContext ctx = new PrincipalContext(ContextType.Domain);
UserPrincipal user = UserPrincipal.FindByIdentity(ctx, "John Doe");
if(user != null)
{
string firstName = user.GivenName;
string lastName = user.Surname;
string email = user.EmailAddress;
string phone = user.VoiceTelephoneNumber;
}