/// <summary>
        /// Returns a <see cref="System.Threading.Tasks.Task&lt;IAsset&gt;"/> instance for a new <see cref="IAsset"/> with the file in <paramref name="filePath"/>.
        /// </summary>
        /// <param name="assets">The <see cref="AssetBaseCollection"/> instance.</param>
        /// <param name="filePath">The path to the file to upload to the new <see cref="IAsset"/>.</param>
        /// <param name="strategy">The <see cref="IAccountSelectionStrategy"/> used to select a storage account for the new asset.</param>
        /// <param name="options">The <see cref="AssetCreationOptions"/>.</param>
        /// <param name="uploadProgressChangedCallback">A callback to report the upload progress of the file.</param>
        /// <param name="cancellationToken">The <see cref="System.Threading.CancellationToken"/> instance used for cancellation.</param>
        /// <returns>A <see cref="System.Threading.Tasks.Task&lt;IAsset&gt;"/> instance for a new <see cref="IAsset"/> with the file in <paramref name="filePath"/>.</returns>
        public static Task<IAsset> CreateFromFileAsync(this AssetBaseCollection assets, string filePath, IAccountSelectionStrategy strategy, AssetCreationOptions options, Action<IAssetFile, UploadProgressChangedEventArgs> uploadProgressChangedCallback, CancellationToken cancellationToken)
        {
            if (strategy == null)
            {
                throw new ArgumentNullException("strategy");
            }

            string storageAccountName = strategy.SelectAccountForAsset();

            return assets.CreateFromFileAsync(filePath, storageAccountName, options, uploadProgressChangedCallback, cancellationToken);
        }
 /// <summary>
 /// Returns a <see cref="System.Threading.Tasks.Task&lt;IAsset&gt;"/> instance for a new <see cref="IAsset"/> with the file in <paramref name="filePath"/>.
 /// </summary>
 /// <param name="assets">The <see cref="AssetBaseCollection"/> instance.</param>
 /// <param name="filePath">The path to the file to upload to the new <see cref="IAsset"/>.</param>
 /// <param name="options">The <see cref="AssetCreationOptions"/>.</param>
 /// <param name="cancellationToken">The <see cref="System.Threading.CancellationToken"/> instance used for cancellation.</param>
 /// <returns>A <see cref="System.Threading.Tasks.Task&lt;IAsset&gt;"/> instance for a new <see cref="IAsset"/> with the file in <paramref name="filePath"/>.</returns>
 public static Task<IAsset> CreateFromFileAsync(this AssetBaseCollection assets, string filePath, AssetCreationOptions options, CancellationToken cancellationToken)
 {
     return assets.CreateFromFileAsync(filePath, options, null, cancellationToken);
 }
 /// <summary>
 /// Returns a new <see cref="IAsset"/> with the file in <paramref name="filePath"/>.
 /// </summary>
 /// <param name="assets">The <see cref="AssetBaseCollection"/> instance.</param>
 /// <param name="filePath">The path to the file to upload to the new <see cref="IAsset"/>.</param>
 /// <param name="storageAccountName">The name of the storage account where to store the new <see cref="IAsset"/>.</param>
 /// <param name="options">The <see cref="AssetCreationOptions"/>.</param>
 /// <param name="uploadProgressChangedCallback">A callback to report the upload progress of the file.</param>
 /// <returns>A new <see cref="IAsset"/> with the file in <paramref name="filePath"/>.</returns>
 public static IAsset CreateFromFile(this AssetBaseCollection assets, string filePath, string storageAccountName, AssetCreationOptions options, Action<IAssetFile, UploadProgressChangedEventArgs> uploadProgressChangedCallback)
 {
     using (Task<IAsset> task = assets.CreateFromFileAsync(filePath, storageAccountName, options, uploadProgressChangedCallback, CancellationToken.None))
     {
         return task.Result;
     }
 }
 /// <summary>
 /// Returns a <see cref="System.Threading.Tasks.Task&lt;IAsset&gt;"/> instance for a new <see cref="IAsset"/> with the file in <paramref name="filePath"/>.
 /// </summary>
 /// <param name="assets">The <see cref="AssetBaseCollection"/> instance.</param>
 /// <param name="filePath">The path to the file to upload to the new <see cref="IAsset"/>.</param>
 /// <param name="options">The <see cref="AssetCreationOptions"/>.</param>
 /// <param name="uploadProgressChangedCallback">A callback to report the upload progress of the file.</param>
 /// <param name="cancellationToken">The <see cref="System.Threading.CancellationToken"/> instance used for cancellation.</param>
 /// <returns>A <see cref="System.Threading.Tasks.Task&lt;IAsset&gt;"/> instance for a new <see cref="IAsset"/> with the file in <paramref name="filePath"/>.</returns>
 public static Task<IAsset> CreateFromFileAsync(this AssetBaseCollection assets, string filePath, AssetCreationOptions options, Action<IAssetFile, UploadProgressChangedEventArgs> uploadProgressChangedCallback, CancellationToken cancellationToken)
 {
     return assets.CreateFromFileAsync(filePath, (string)null, options, uploadProgressChangedCallback, cancellationToken);
 }