Now first try to understand about azure blob.

• Using blob, image or documents upload directly to browser 
• Using blob, Uploading video or audio
• Storing data for backup and restore 
• Storing data for analysis by an on-premises or Azure-hosted service

• Storage Account: Storage Account is done through azure access storage account. General-purpose storage account or a Blob storage account which is specialised for storing objects/blobs. please check for more information About Azure Storage Account.
• Container: Container provider grouping of a set of blobs. an account can contains number of containers.NOTE: The container name must be an small lovercase.
• Blob: Hear Microsoft describe different type of blob mention below. 
• Block Blobs: Are Storing text or binary file, such as media files.
• Page Blobs: can more efficient to read/write orations.Azure Virtual Machines use page blobs as OS and data disks.
• Append Blobs: Are similar to block blob type

3. Create an Azure Storage Account

• First Create an Azure portal account.
• To learn more, see Create a storage account.
• Then Create Azure Storage Account by using Storage Resource Provider Client Library for .NET

4. Create Project in Visual Studio

In Visual Studio, Create an Console application or project first.hear i create console application.

1.  Select File > New > Project 
2. Select Installed > Templates > Visual C# > Windows Classic Desktop
3. Select Console App (.NET Framework)
4. Enter a name for your application in the Name: field
5. Select OK

5. Install client library & Azure Configuration manager using nuget packages

Hear two main package need to reference in your project.

• Microsoft Storage Client Library for .Net:
• In Visual Studio, Tool > NuGetPackage Manager > Package manager then use this command in command manager.
• PM> Install-Package WindowsAzure.Storage -Version 8.4.0
• Microsoft Azure Configuration Manager 
• In Visual Studio, Tool > NuGetPackage Manager > Package manager then use this command in command manager.
• PM>Install-Package Microsoft.WindowsAzure.ConfigurationManager -Version 3.2.3

6. Code Upload a Image into a container

• Create one class file in created project like xxx.cs file.
• Created this class file Create Static method.

Below mention .net c# code for upload image using block blob type blob storage

static void Main(string[] args)
{
    UploadImageInToBlobStorage();
}

//Class file method

public static void UploadImageInToBlobStorage()
{
// Block blob basics example
StartBlockBlobOperationsAsync().Wait();
}

private static async Task StartBlockBlobOperationsAsync()
{

CloudStorageAccount cloudStorageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("StorageConnectionString"));

CloudBlobClient cloudBlobClient = cloudStorageAccount.CreateCloudBlobClient();

CloudBlobContainer cloudBlobContainer = cloudBlobClient.GetContainerReference("adftechnobrainsblob");

if (await cloudBlobContainer.CreateIfNotExistsAsync())

{

await cloudBlobContainer.SetPermissionsAsync(

new BlobContainerPermissions

{

PublicAccess = BlobContainerPublicAccessType.Blob

}

);

}

CloudBlockBlob cloudBlockBlob = cloudBlobContainer.GetBlockBlobReference("Image Name Hear");

cloudBlockBlob.Properties.ContentType = filetype;

//HttpPostedFileBase file object property use InputStream

await cloudBlockBlob.UploadFromStreamAsync(Image Stream hear);

}

In Web.config file, under the appSetting key 

So, that's all guys i hope These will you to understand basic of Azure blob upload document.