vb.net中需要的程序代码............数据库ms Access 2007吗?

我正在以一种形式进行计算机商店管理项目...我正在展示存在的产品
键盘和鼠标(50)，所以我需要减少它而不进行修改，它应该自动删除自身49
或45 ..当我售出1个键盘和鼠标或5 .......售出键盘和鼠标之后，它应该显示为键盘和鼠标(45)，是否有相应的代码....... .我正在使用两种形式的可用性表格"和结算表格3 ..".当以结算表格3出售时，应自动将其自身从可用性表格1数据库中删除... ms access 2007 .....

am doing computer shop management project... in one form i am showing product that exist
keyboards and mouse(50) so i need to reduce it without modify it should automatically delete itself 49
or 45 ..when i sold 1 keyboards and mouse or 5 .......after sold the keyboards and mouse it should show itself as keyboards and mouse(45)is there any code for that ........I am using two forms AVAILABILITY FORM1 and BILLING FORM3.. when sold in billing form3 it should automatically delete itself in availability form1 database...ms access 2007........