Byte Conversion Class.cs

public class ByteConversion
{
        /// 
        /// Converts your number from the specified fromUnit to the toUnit
        /// 
        ///Number to convert
        ///ByteUnit that the number is already in.
        ///ByteUnit that you want to convert your number too.
        /// 
	public static double Convert(double number, ByteUnit fromUnit, ByteUnit toUnit)
	{
		int difference = (int)fromUnit - (int)toUnit;
		if (difference < 0)
		{
			return number / Math.Pow(1024, Math.Abs(difference));
		}
		else if (difference > 0)
		{
			return number * Math.Pow(1024, difference);
		}
		else //These are the same unit
		{
			return number;
		}
	}

        /// 
        /// Converts the specified number to the closest unit based on size and formats as text.
        /// 
        ///Number to convert
        ///ByteUnit that the number is already in.
        ///ByteUnit that you want to convert your number too.
        ///Separator text between the number and the unit designator (default = " ")
        /// 
	public static string GetString(double number, ByteUnit fromUnit, string separator = " ")
	{
		var numberInBytes = Convert(number, fromUnit, ByteUnit.Byte);
		ByteUnit toUnit = fromUnit;

		foreach (ByteUnit unit in Enum.GetValues(typeof(ByteUnit)))
		{
			double multiplier = 0;
			int unitMultiplier = (int)unit;
			if (unitMultiplier > 0)
			{
				multiplier = Math.Pow(1024, unitMultiplier);
			}

			var result = numberInBytes / multiplier;
			if (result < 1024)
			{
				toUnit = unit;
				break;
			}
		}

		return GetString(number, fromUnit, toUnit, separator);
	}

        /// 
        /// Converts the specified number to the unit provided and formats as text.
        /// 
        ///Number to convert
        ///ByteUnit that the number is already in.
        ///ByteUnit that you want to convert your number too.
        ///Separator text between the number and the unit designator (default = " ")
        /// 
	public static string GetString(double number, ByteUnit fromUnit, ByteUnit toUnit, string separator = " ")
	{
		var convertedNumber = Convert(number, fromUnit, toUnit);
		return String.Format("{0}{1}{2}", convertedNumber, separator, toUnit.GetDescription());
	}
}