how to obtain highest value in datagridview in C#.net

hi
example for this que is ..

i have 10 values in my datagrid like

1 2 3 4 5 6 7 8 9 10 MIN MAX
10 10.1 10.2 10.3 10.4 10.5 10.6 10.7 10.8 10.9 10 10.9

so, when i change the 3rd value 10.2 to 10.05 --- then my MIN value should have to automatically update us 10.05 as the same when i change a value and if the changed value is MAX in the grid then the MAX value should be Updated...

is that any one could help in coding vise