public PrincipalContext GetPrincipalContext() { PrincipalContext oPrincipalContext = new PrincipalContext(ContextType.Domain,"Your Domain Name"); return oPrincipalContext; } To get the single user public UserPrincipal GetUser(string userName) { PrincipalContext oPrincipalContext = GetPrincipalContext(); UserPrincipal oUserPrincipal = UserPrincipal.FindByIdentity(oPrincipalContext, userName ); return oUser...