How to get Username after successful login in Forms Authentication ASP.Net

Hi

http://www.aspsnippets.com/Articles/Simple-User-Login-Form-example-in-ASPNet.aspx

With reference to this link,i want to get the value of login username who when try to access the page. It should be recorded into the new sql table. Purpose is to monitor the page and people who want to access the page.

can you please tell me username value, where it reside in the code