Want to know Event of datagridview for some work

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C#

C#4.0

Hi Friends..

I want to do some work similar to following

suppose Datagridview consist of two columns (Attendence1 , Attendence2 of Checkbox type)

I want user must check both columns true then he focus to next row.

For this i tried RowLeave Event but, when user mark Attendence1 ,attendence2 and then he click / Hit enter to move to next row then it is showing message that first mark column attendence2 . When i look in code with breakpoint, then i saw value of attendence2 columns is false, but i have marked true.

Tell me which event i should use, which check instantly when i leave row.
Thanks