Home > DotNet, Windows Azure > How to upload blob to azure using ASP.Net / Tool for upload files to azure using ASP.Net,C#

How to upload blob to azure using ASP.Net / Tool for upload files to azure using ASP.Net,C#

Simple way to Upload files to azure blob  

When we are dealing with windows azure application in ASP.Net we need to communicate with blobs in the azure from the asp.net code. Here we are going to demonstrate how we can upload files from local system to windows azure storage space using asp.net code. The application offers user to upload all files in the mapped local folder to a blob in the azure. It is a usefull tool for working with windows azure storage for upload files.

Requirements need to upload files in to azure blob

For upload files from local folder to azure we must need a azure storage account name and account key. We can purchase it from Microsfot. 

Steps to upload files into azure storage

  1. Create a simple windows application from visual studio, file >> new project >> visual C# >> Windows >> Windows Forms Application
  2. Need to add reference ‘Microsoft.WindowsAzure.StorageClient.dll’ that we can available after installing
  3. Drag a Button(For upload), a textbox (For display status) and a ListBox (List files with error or success message)to the form.
  4. On Button Click function we are going to upload file from local folder (here C:\\myfiles we can configure by accepting browse option).  

UI Design for the upload file to Azure Storage application

C# Source Code for Upload files to Azure Storage  

private void button1_Click(object sender, EventArgs e)
if (txtFolderName.Text == "")
MessageBox.Show("Please select a folder to upload files");
if (MessageBox.Show("Do you want to Upload files to Blob?",
    "Confirm Upload", MessageBoxButtons.YesNo) == DialogResult.Yes)
lblHeader.Visible = false;
txtStatusMessage.Text = "Upload Starting...";
lblHeader.Visible = true;

public void UploadFileIntoBlop(string fileFullPath)
string dataCenterSettingKey =
        "DefaultEndpointsProtocol=" + "http" + ";AccountName="
        + "YourAccountNameHere" + ";AccountKey=" +
string filepath = "";
CloudStorageAccount storageAccount =
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
string csvfileblob = "migrationfiles";
CloudBlobContainer blobContainer =
bool isError = false;
foreach (string file in Directory.GetFiles(fileFullPath))
string[] filename = file.Split('\\');
string theFile = filename[filename.Length - 1];
DateTime startDate = DateTime.Now;
filepath = file.Trim();
FileStream fileContent = ReadFile(filepath);
var blob = blobContainer.GetBlobReference(theFile);
TimeSpan difference = DateTime.Now.Subtract(startDate);
int totalSeconds = (int)Math.Ceiling(difference.TotalMinutes);
lstBxFiles.Items.Add(theFile +
" _Success (" + totalSeconds + " mnts)");
catch (Exception ex)
isError = true;
lstBxFiles.Items.Add(theFile + " _Error");
if (isError)
txtStatusMessage.Text = "Process completed with errors";
txtStatusMessage.Text = "Upload done successfully";
catch (Exception ex)
txtStatusMessage.Text = "Eror Ocurred : " + ex.Message;

public FileStream ReadFile(string fileFullPath)
FileStream fileStream = null;
if (System.IO.File.Exists(fileFullPath))
fileStream = new FileStream(fileFullPath,
FileMode.Open, FileAccess.Read);
return fileStream;

private void btnBrowse_Click(object sender, EventArgs e)
DialogResult result = this.folderBrowserDialog1.ShowDialog();
if (result == DialogResult.OK)
txtFolderName.Text = this.folderBrowserDialog1.SelectedPath;

 Run the application, then press upload button then in the button click event, we are calling UploadFileIntoBlop function. Then it will take all files under the local folder (folder path can be passed as parameter), and uploaded to a container (here it is migration files). In the middle of uploading to blob, we are adding all file names under the mentioned local folder in to list box with the status of whether it is uploaded or not. We can use this application as the tool for upload files from local to azure blob storage.

  1. pallavi
    February 18, 2013 at 10:27 am

    I’m just getting started with my first Azure app. Here’s something which I wanted to implement in my first application:
    1. The first page allows various users to log in, each user given their own username.
    2. Once they’ve logged in, they would be able to upload their documents which will be stored in the Windows Azure Blob. Each document would have a particular id.
    3. All the documents which have been uploaded on the Blob will be visible to all the users. However, if a user wishes to edit a particular document, he will need the document id to access it.
    4. Once he’s given access, he’ll be able to edit the document just like Google docs and save changes after he’s done.
    5. The last feature is something which will depend on how quickly I get the first 4 steps done. I was earlier thinking of collaborative editing but that would be a little out of my scope right now as I’m a beginner. An alternative to this would be to restrict access to a user if he’s trying to open a document which has already been opened by some other user.

    I would like to implement all of this on Microsoft Visual Studio 2012 using Visual C# and ASP.net. I’ve already created the free Azure cloud.
    Please let me know how to get started or if any of you know any useful links which I can refer to.
    Thanks a lot.

  2. February 18, 2013 at 10:47 am

    Hi Pallavi,

    Thank you for visiting our blog.
    A high level implementation of your requirements are given below.
    1. You have to create a table for ‘users’ in the database (You didnt mention your database) and create a page for login as a normal application page. Only users having username and password in the table ‘users’ can access the application

    2.For uploading logged in users, you can use same code that we posted here.

    3. By giving access key and access password you can listed out the name of all blobs in the grid view or any other controls.

    4.To obtain the edit functionality, better is first download docs from the blob and gives an option to edit the doc from local, once it edited user can upload file same as step2. Then the same name file will be replaced by new one.

    Please go through it and let me know any doubts.
    If you want more help shoot details to my email id. infotuvian@gmail.com

  3. May 3, 2013 at 3:36 am

    Spot on with this write-up, I seriously believe that this web site needs far more attention.
    I’ll probably be back again to see more, thanks for the info!

  1. June 28, 2011 at 1:44 pm
  2. July 25, 2011 at 6:17 am

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