Format numbers as you wish

int yourNumber = 125;
Console.WriteLine(yourNumber.ToString("00000", CultureInfo.InvariantCulture));

int yourNumber = 125;
Console.WriteLine(yourNumber.ToString("00000.00", CultureInfo.InvariantCulture));

double yourNumber = 12543.234;
Console.WriteLine(yourNumber.ToString("00,000.00", CultureInfo.InvariantCulture));