/// <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);
            }
        }
        /// <summary>
        /// Test blob write and creation, expecting lease failure.
        /// </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 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 BlobWriteExpectLeaseFailureAPM(CloudBlockBlob testBlob, CloudBlockBlob sourceBlob, AccessCondition testAccessCondition, HttpStatusCode expectedStatusCode, string expectedErrorCode, string description)
        {
            this.BlobCreateExpectLeaseFailure(testBlob, sourceBlob, testAccessCondition, expectedStatusCode, expectedErrorCode, description);

            using (AutoResetEvent waitHandle = new AutoResetEvent(false))
            {
                IAsyncResult result = testBlob.BeginSetMetadata(testAccessCondition, null /* options */, null /* operationContext */, ar => waitHandle.Set(), null);
                waitHandle.WaitOne();
                TestHelper.ExpectedException(
                    () => testBlob.EndSetMetadata(result),
                    description + " (Set Metadata)",
                    expectedStatusCode,
                    expectedErrorCode);

                result = testBlob.BeginSetProperties(testAccessCondition, null /* options */, null /* operationContext */, ar => waitHandle.Set(), null);
                waitHandle.WaitOne();
                TestHelper.ExpectedException(
                    () => testBlob.EndSetProperties(result),
                    description + " (Set Properties)",
                    expectedStatusCode,
                    expectedErrorCode);

                result = testBlob.BeginDelete(DeleteSnapshotsOption.None, testAccessCondition, null /* options */, null /* operationContext */, ar => waitHandle.Set(), null);
                waitHandle.WaitOne();
                TestHelper.ExpectedException(
                    () => testBlob.EndDelete(result),
                    description + " (Delete)",
                    expectedStatusCode,
                    expectedErrorCode);
            }
        }