删除ASP.Net中应用程序关闭的所有元素

Can anyone help me in this. Am using Asp.NET WITH C#. I am have an number of products in my database. When I run my code all the products values are stored in a database table. Without an exit button, if I close my application, when I run for second time the database table should be empty. I CANT USE !PAGE.ISPOSTBACK because I add different products at single run time, which will delete for single users. Could anyone tell me, or show code for deleting elements as the application is closed without internal exit button event.Can anyone help me in this. Am using Asp.NET WI