How to get a gridview cell data ?

Hey freinds,

I have i gridview connected to a List<>. My Gridview show me 3 coloums/cells ... (Name  -  Age  - money )

Now i want to add an axtra filed ind gridview "Accept"..sÃ?Â¥ i have 4 cells in gridview..(   Name    - Age  - money  - Accept)

I will in  aceept colum write ""yes"" , if Nam -age and mony is not null..

How can i read Name - Age- money cells data and write yes in accept ?
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