using System;

public class Program

{

    public static void Main()

    {

        var decimalValue = 120.5;

​

        // String value is "It costs $120.50" (depending on your local currency settings)

        var asCurrency = $"It costs {decimalValue:C}";

        Console.WriteLine(asCurrency);

        // String value is "Exactly 120.500"

        var withThreeDecimalPlaces = $"Exactly {decimalValue:F3}";

        Console.WriteLine(withThreeDecimalPlaces);

        var integerValue = 57;

        Console.WriteLine(integerValue);

        // String value is "00057"

        var prefixedIfNecessary = $"{integerValue:D5}";

        Console.WriteLine(prefixedIfNecessary);

    }

}