how to validate duplicate cell in each column in DGV
Design as in data grid view;
Date Period CK RK MK Vk RK CMk VB GS MS TMS(STaff Name)
7/1/2013 1 reo reo(course)
7/1/2013 2 PH2 REO
in the date(7/1/2013) for lst Period reo should not come twice in the column.
for that how to avoid the duplicate,the course name (reo) in data grid view.
please help me. please send the code.for that duplication for course name (reo)