Upload files to Azure Blobs FAST

AzureAsync.cs

ServicePointManager.DefaultConnectionLimit = 300;

var tempFolder = "Path To Folder Of Files You Want To Upload";
var cloudStorageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("ConnectionString"));
var blobClient = cloudStorageAccount.CreateCloudBlobClient();
List<Task> tasks = new List<Task>();
CloudBlobContainer toBlobContainer = blobClient.GetContainerReference("ContainerName");
toBlobContainer.CreateIfNotExist();
            
foreach (var fileName in Directory.GetFiles(tempFolder))
{
    var toBlob = toBlobContainer.GetBlockBlobReference(fileName);
    var stream = File.OpenRead(fileName);
    var task = Task.Factory.FromAsync(toBlob.BeginUploadFromStream, toBlob.EndUploadFromStream, stream, null)
        .ContinueWith(t =>
        {
            stream.Dispose();
        });
    tasks.Add(task);
}

Task.WaitAll(tasks.ToArray());