/// <summary>
/// Puts the lease on the given blob in a leased state.
/// </summary>
/// <param name="blob">The blob with the lease.</param>
/// <param name="leaseTime">The amount of time on the new lease.</param>
/// <returns>The lease ID of the current lease.</returns>
internal static string SetLeasedState(CloudBlob blob, TimeSpan? leaseTime)
{
string leaseId = Guid.NewGuid().ToString();
SetAvailableState(blob);
return blob.AcquireLease(leaseTime, leaseId);
}