how to restrict user not to enter more than 2 digits after decimal point in datagridview in windows forms

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C#

C#4.0

hi,
i have a datagridview in which we enter prices in cells..
user's prices doesnt not have more than 2 digits after decimal point..
for example his prices all are like 9.99/99.99/999.99/9999.99/99999.99/999999.99 .....
but not like 9.999/9.9999/9.99999

i written a code in which we enter more than two digits, after cell leave it was recurring and displaying two digits only like 8.89999 it will display 8.90 after cell leave as it will recur.

but i dont want recurring. it should restrict entering more than two digits.
like

if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) && e.KeyChar != '.')
            {
                e.Handled = true;
            }

in this code it will restrict entering alphabetic letters..
like this i want a code which should restrict only two digits after decimal point.....

Thanks in Advance