/// <summary>
/// Get the available disk space for a path.
/// </summary>
/// <param name="directoryPath">The path to a valid directory.</param>
/// <returns>Available disk space, in bytes.</returns>
public static long GetAvailableFreeSpace(string directoryPath)
{
DriveInfo volumeName = new DriveInfo(DirectoryHelper.GetVolumeName(directoryPath));
return(GetAvailableFreeSpace(volumeName));
}