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// For complete examples and data files, please go to https://github.com/atirtahirgroupdocs/GroupDocs.Signature-for-.NET
public class AzureOutputDataHandler : AzureDataHandler, IOutputDataHandler
{
    /// <summary>
    /// Handles azure output data
    /// </summary>
    /// <param name="endpoint">End point</param>
    /// <param name="accountName">Account name</param>
    /// <param name="accountKey">Key</param>
    /// <param name="containerName">Container Name</param>
    public AzureOutputDataHandler(string endpoint,
                                       string accountName,
                                       string accountKey,
                                       string containerName) :
        base(endpoint, accountName, accountKey, containerName)
    {
    }

    /// <summary>
    /// Creates file
    /// </summary>
    /// <param name="fileDescription">Description of the file</param>
    /// <param name="signOptions">Sign options</param>
    /// <param name="saveOptions">Save options</param>
    /// <returns>writeable append blob</returns>
    public Stream CreateFile(FileDescription fileDescription, SignOptions signOptions = null,
        SaveOptions saveOptions = null)
    {
        CloudBlobContainer container = GetContainerReference();
        string name = fileDescription.GUID.ToLower();
        CloudBlockBlob blob = container.GetBlockBlobReference(name);
        using (MemoryStream emptyStream = new MemoryStream())
        {
            blob.UploadFromStream(emptyStream);
        }
        try
        {
            CloudAppendBlob appendBlob = container.GetAppendBlobReference(name);
            appendBlob.CreateOrReplace();
            return appendBlob.OpenWrite(true);
        }
        catch (Microsoft.WindowsAzure.Storage.StorageException exception)
        {
            // Azure Storage Emulator does not support append BLOBs,
            // so we emulate appending
            return new CachingAzureStream(blob);
        }
    }

    /// <summary>
    /// Creats stream
    /// </summary>
    /// <param name="fileDescription"></param>
    /// <param name="signOptions"></param>
    /// <param name="saveOptions"></param>
    /// <returns></returns>
    public Stream CreateStream(FileDescription fileDescription, SignOptions signOptions = null,
        SaveOptions saveOptions = null)
    {
        throw new NotImplementedException();
    }
}