if (size < 1024)
        {
            return size.ToString("F0") + " bytes";
        }
        else if ((size >> 10) < 1024)
        {
            return (size / 1024F).ToString("F1") + " KB";
        }
        else if ((size >> 20) < 1024)
        {
            return ((size >> 10) / 1024F).ToString("F1") + " MB";
        }
        else if ((size >> 30) < 1024)
        {
            return ((size >> 20) / 1024F).ToString("F1") + " GB";
        }
        else if ((size >> 40) < 1024)
        {
            return ((size >> 30) / 1024F).ToString("F1") + " TB";
        }
        else if ((size >> 50) < 1024)
        {
            return ((size >> 40) / 1024F).ToString("F1") + " PB";
        }
        else
        {
            return ((size >> 50) / 1024F).ToString("F0") + " EB";  // Should be F1 ?
        }

[TestMethod]
    [DataRow(1024L - 1, "1023 bytes")]
    [DataRow(1024L, "1.0 KB")]
    [DataRow(1024L * 1024, "1.0 MB")]
    [DataRow(1024L * 1024 * 1024, "1.0 GB")]
    [DataRow(1024L * 1024 * 1024 * 1024, "1.0 TB")]
    [DataRow(1024L * 1024 * 1024 * 1024 * 1024, "1.0 PB")]
    [DataRow(1024L * 1024 * 1024 * 1024 * 1024 * 1024, "1 EB")] // NOTE !
    public void Test_ToFileSizeString(long size, string expected)
    {
        Assert.AreEqual(expected, Converters.ToFileSizeString(size));
    }

    [TestMethod]
    [DataRow(1024L - 1, "1023 bytes")]
    [DataRow(1024L, "1.0 KB")]
    [DataRow(1024L * 1024, "1.0 MB")]
    [DataRow(1024L * 1024 * 1024, "1.0 GB")]
    [DataRow(1024L * 1024 * 1024 * 1024, "1.0 TB")]
    [DataRow(1024L * 1024 * 1024 * 1024 * 1024, "1.0 PB")]
    [DataRow(1024L * 1024 * 1024 * 1024 * 1024 * 1024, "1.0 EB")]  // NOTE !
    public void Test_ToFileSizeString(long size, string expected)
    {
        Assert.AreEqual(expected, Converters.ToFileSizeString(size));
    }