CloudBlobContainer.SetMetadata Method ()

static void WriteContainerMetadata(Uri blobEndpoint, string accountName, string accountKey)
{
    //Create service client for credentialed access to the Blob service.
    CloudBlobClient blobClient = 
        new CloudBlobClient(blobEndpoint, 
                            new StorageCredentialsAccountAndKey(accountName, accountKey));

    //Return a container reference.
    CloudBlobContainer container = new CloudBlobContainer("mycontainer", blobClient);

    //Create the container if it does not exist.
    container.CreateIfNotExist();

    //Define some metadata for the container.
    container.Metadata["category"] = "images";
    container.Metadata["owner"] = "azureix";

    //Write the metadata to the service.
    container.SetMetadata();
}