How to save checkbox state checked in gridview while shorting the datagridview windows form c#..?

How to save checkbox state checked in gridview while shorting the datagridview from click on header or and from textbox textchange event. in winfows form c#.please help...thanks in advance.this is first pageload

i checked 2 lab tests

i have shorted by click on header of any column or by text search i lost the checked lab test