How to round decimal to 3 decimal places?

I have variable result. It contains each time different value. It is decimal number. How can i round or just show 3 decimal places?

Code:

var result = amount * exchangeRate1[fromCurrency] / exchangeRate2[toCurrency];

if you want to SHOW 3 decimal places, you have to format value to string

 string val = Math.Round(result,3).ToString("0.000"); // 2.000

if you use just Round

result = Math.Round(result,3) // 2

it will be shown less then 3 decimal places, if your result has less than 3 decimal places.

Try this:

Math.Round(result, 3);