Deleting record at a constant time.

Hi Y'all,

I have a table in a database with 7 columns. A gridview is getting its data from the table and the rows are editable.

Once it is 12 midnight everyday, any record in column 5, 6, 7 should be deleted to prepare the columns for fresh record the following morning.

Since there won't be any event to trigger this, I need someone to explain to me how to go about this, where to write and call the method.

Thanks in advance.