using System;

public class Program

{

    public static void Main()

    {

        double posValue = 1234;

        double negValue = -1234;

        double zeroValue = 0;

​

        string fmt1 = "##";

        string fmt2 = "##;(##)";

        string fmt3 = "##;(##);**Zero**";

​

        Console.WriteLine(posValue.ToString(fmt1));

        Console.WriteLine(negValue.ToString(fmt1));

        Console.WriteLine(posValue.ToString(fmt2));

        Console.WriteLine(String.Format("{0:" + fmt2 + "}", posValue));

        // Displays 1234

​

        Console.WriteLine(negValue.ToString(fmt2));

        Console.WriteLine(String.Format("{0:" + fmt2 + "}", negValue));

        // Displays (1234)

​

        Console.WriteLine(zeroValue.ToString(fmt3));

        Console.WriteLine(String.Format("{0:" + fmt3 + "}", zeroValue));

        // Displays **Zero**

    }

}