How to add attendance through grid view?
<p>I created one asp.net website with visual basic and sql server. I created a table usermaster that stores complete details of students i.e their choosen course and semester numbers. Now i want to add attendance system to my project. I created two dropdown list for choosing course and semesters from other tables and a grid view for viewing student register number and their name from usermaster table. When the item selected from two drop down list then grid view generates student no and their name according to their course and semester number. Now i need to add check boxes in each rows of the new column in the grid view. When i add new coloumn in the grid view with check box we must specify datafield value from the database. I dont have such type of fields in database table, but i want to store exactly student reg number date and status: 'present or absent' in new database table while submiting a button, 'present' if check box checked 'absent' if check box unchecked. Cant we add check boxes without bounding data in grid view..? if i give simple name means shows error.. please help me 
guide me please....</p>
