// Retrieve storage account from connection string.
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
CloudConfigurationManager.GetSetting("StorageConnectionString"));

// Create the blob client.
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

// Retrieve a reference to a container.
CloudBlobContainer container = blobClient.GetContainerReference("mycontainer");

// Create the container if it doesn't already exist.
container.CreateIfNotExists();

// Add some metadata to the container.
container.Metadata.Add("docType", "textDocuments");

According to Microsfot documentation:

“You will receive a 400 Bad Request if any name/value pairs contain non-ASCII characters. Metadata name/value pairs are valid HTTP headers, and so must adhere to all restrictions governing HTTP headers. It is therefore recommended that you use URL encoding or Base64 encoding for names and values containing non-ASCII characters.”

https://docs.microsoft.com/en-us/azure/storage/blobs/storage-properties-metadata

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