Change the name of the LoginName controller in ASP.net

I came across the situation that user need to change the name of the LoginName controller when user change his or her name so that what I did was I include following code.

LoginView loginView = (LoginView)Master.FindControl("UBLoginView");
LoginName loginName = loginView.FindControl("UBLoginName") as LoginName;
loginName.FormatString = FullName.Text;

in first line Find and instantiate the LoginView from the master page otherwise if you try to directly instantiate the LoginName it will throw a null reference exception. Now you all know what the use of second line is, and finally equal new name to LoginName.