How can i update 2 opposition data ?

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VB

my problem is like this i have currency table need to update the rate base on each another
-------------------------------
|currency | SGD | MYR | USD |
-------------------------------
|SGD | ### | 3.00 | 1.30|
-------------------------------
|MYR | 3.00 | ### | 4.20|
-------------------------------
|USD | 1.30 | 4.20 | ### |

if i update row 1 currency SGD TO MYR is 3.00 so at the same time program will auto update row 2 value MYR To SGD 3.00

any idea to solve my problem ?

What I have tried:

i have try use data grid view but cannot meet my case