int value = -;

            Console.WriteLine(value.ToString("D8"));

            double doubleNumber = 12345.678;

            Console.WriteLine(doubleNumber.ToString("E",CultureInfo.InvariantCulture)); //1.234568E+004

            int integerNumber = ;

            Console.WriteLine(integerNumber.ToString("F")); //1234567.00

            int zeroSpecifierInteger = ;

            Console.WriteLine(zeroSpecifierInteger.ToString("")); //

            double zeroSpecifierDouble = 12.345;

            Console.WriteLine(zeroSpecifierDouble.ToString("00.00"));   //12.35

            Console.WriteLine(zeroSpecifierDouble.ToString("000.00")); //012.35

            double zeroSpecifierWithComma = 1234567890.890;

            Console.WriteLine(zeroSpecifierWithComma.ToString("0,0.00",CultureInfo.InvariantCulture)); //1,234,567,890.89

            Console.Read();