/// <summary>
        /// Test blob reads, expecting lease failure.
        /// </summary>
        /// <param name="testBlob">The blob to test.</param>
        /// <param name="targetBlob">The blob to use for the target of copy operations.</param>
        /// <param name="testAccessCondition">The failing access condition to use.</param>
        /// <param name="expectedErrorCode">The expected error code.</param>
        /// <param name="description">The reason why these calls should fail.</param>
        private void BlobReadExpectLeaseFailureAPM(CloudBlockBlob testBlob, CloudBlockBlob targetBlob, AccessCondition testAccessCondition, HttpStatusCode expectedStatusCode, string expectedErrorCode, string description)
        {
            // FetchAttributes is a HEAD request with no extended error info, so it returns with the generic ConditionFailed error code.
            using (AutoResetEvent waitHandle = new AutoResetEvent(false))
            {
                IAsyncResult result = testBlob.BeginFetchAttributes(testAccessCondition, null /* options */, null /* operationContext */, ar => waitHandle.Set(), null);
                waitHandle.WaitOne();
                TestHelper.ExpectedException(
                    () => testBlob.EndFetchAttributes(result),
                    description + "(Fetch Attributes)",
                    HttpStatusCode.PreconditionFailed);

                result = testBlob.BeginSnapshot(null /* metadata */, testAccessCondition, null /* options */, null /* operationContext */, ar => waitHandle.Set(), null);
                waitHandle.WaitOne();
                TestHelper.ExpectedException(
                    () => testBlob.EndSnapshot(result),
                    description + " (Create Snapshot)",
                    expectedStatusCode,
                    expectedErrorCode);

                TestHelper.ExpectedException(
                    () => DownloadTextAPM(testBlob, Encoding.UTF8, testAccessCondition, null /* options */),
                    description + " (Download Text)",
                    expectedStatusCode,
                    expectedErrorCode);

                result = testBlob.BeginOpenRead(testAccessCondition, null /* options */, null /* operationContext */, ar => waitHandle.Set(), null);
                waitHandle.WaitOne();
                TestHelper.ExpectedException(
                    () => testBlob.EndOpenRead(result),
                    description + " (Read Stream)",
                    expectedStatusCode/*,
                expectedErrorCode*/);
            }
        }
        /// <summary>
        /// Test blob reads, expecting success.
        /// </summary>
        /// <param name="testBlob">The blob to test.</param>
        /// <param name="testAccessCondition">The access condition to use.</param>
        private void BlobReadExpectLeaseSuccessAPM(CloudBlockBlob testBlob, AccessCondition testAccessCondition)
        {
            using (AutoResetEvent waitHandle = new AutoResetEvent(false))
            {
                IAsyncResult result = testBlob.BeginFetchAttributes(testAccessCondition, null /* options */, null /* operationContext */, ar => waitHandle.Set(), null);
                waitHandle.WaitOne();
                testBlob.EndFetchAttributes(result);

                result = testBlob.BeginSnapshot(null /* metadata */, testAccessCondition, null /* options */, null /* operationContext */, ar => waitHandle.Set(), null);
                waitHandle.WaitOne();
                testBlob.EndSnapshot(result).Delete();

                DownloadTextAPM(testBlob, Encoding.UTF8, testAccessCondition, null /* options */);

                result = testBlob.BeginOpenRead(testAccessCondition, null /* options */, null /* operationContext */, ar => waitHandle.Set(), null);
                waitHandle.WaitOne();
                Stream stream = testBlob.EndOpenRead(result);
                stream.ReadByte();
            }
        }
        /// <summary>
        /// Test blob writing, expecting success.
        /// </summary>
        /// <param name="testBlob">The blob to test.</param>
        /// <param name="sourceBlob">A blob to use as the source of a copy.</param>
        /// <param name="testAccessCondition">The access condition to use.</param>
        private void BlobWriteExpectLeaseSuccessAPM(CloudBlockBlob testBlob, CloudBlob sourceBlob, AccessCondition testAccessCondition)
        {
            using (AutoResetEvent waitHandle = new AutoResetEvent(false))
            {
                IAsyncResult result = testBlob.BeginSetMetadata(testAccessCondition, null /* options */, null /* operationContext */, ar => waitHandle.Set(), null);
                waitHandle.WaitOne();
                testBlob.EndSetMetadata(result);

                result = testBlob.BeginSetProperties(testAccessCondition, null /* options */, null /* operationContext */, ar => waitHandle.Set(), null);
                waitHandle.WaitOne();
                testBlob.EndSetProperties(result);

                UploadTextAPM(testBlob, "No Problem", Encoding.UTF8, testAccessCondition, null /* options */);
                result = testBlob.BeginStartCopy(TestHelper.Defiddler(sourceBlob.Uri), null /* source access condition */, testAccessCondition, null /* options */, null /* operationContext */, ar=>waitHandle.Set(), null);
                waitHandle.WaitOne();
                testBlob.EndStartCopy(result);

                while (testBlob.CopyState.Status == CopyStatus.Pending)
                {
                    Thread.Sleep(1000);
                    result = testBlob.BeginFetchAttributes(ar => waitHandle.Set(), null);
                    waitHandle.WaitOne();
                    testBlob.EndFetchAttributes(result);
                }

                result = testBlob.BeginOpenWrite(testAccessCondition, null /* options */, null /* operationContext */, ar => waitHandle.Set(), null);
                waitHandle.WaitOne();
                Stream stream = testBlob.EndOpenWrite(result);
                stream.WriteByte(0);
                stream.Flush();

                result = testBlob.BeginDelete(DeleteSnapshotsOption.None, testAccessCondition, null /* options */, null /* operationContext */, ar => waitHandle.Set(), null);
                waitHandle.WaitOne();
                testBlob.EndDelete(result);
            }
        }