Update or set Blob Storage metatag properties

setblobmetatagvalue.cs

var sa = CloudStorageAccount.Parse(conString);
var blobClient = sa.CreateCloudBlobClient();
var container = blobClient.GetContainerReference("<yourcontainername>");
var blob = container.GetBlockBlobReference("<yourblobname>");
blob.Metadata.Add("IsDeleted", "false");