/// <summary>
/// Gets the XSH a1 asynchronous.
/// </summary>
/// <param name="client">The client.</param>
/// <param name="path">The path.</param>
/// <param name="factory">The factory.</param>
/// <param name="creationOptions">The creation options.</param>
/// <param name="scheduler">The scheduler.</param>
/// <returns></returns>
public static Task <string> GetXSHA1Async(this FtpClient client, string path,
TaskFactory <string> factory = null,
TaskCreationOptions creationOptions = default(TaskCreationOptions),
TaskScheduler scheduler = null)
{
return((factory = factory ?? Task <string> .Factory).FromAsync(
client.BeginGetXSHA1(path, null, null),
XSHA1.EndGetXSHA1,
creationOptions, scheduler ?? factory.Scheduler ?? TaskScheduler.Current));
}