Uploading File To AWS S3 Using ASP.NET

Joseph Thomas

6y238.3k16100Article

ASP.NETFileupload To AWS S3

16 Comments

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User44004y ago
I have one doubt. why you're gave "FileUpload1" please let me know that meaning. That place I am confused.
Anjali agarwal5y ago
Thank you so much for the tutorial!!
Michael Lucas5y ago
My configuration as an Endpoint where do I place this information, and how is it accessed through the code?
Vivek Sadokpam5y ago
How can multiple file uploaded?
vikas sharma6y ago
Hi Joseph this article is very helpful. But i did not find that how we can download file form AWS s3 bucket in asp.net. Can you please help to do this.
שי ישראלי7y ago
Hi, How can I get back the URL of download this file from the service after uploaded?
cristian merli7y ago
Hello, where can i find the AWSProfileName, AWSAccessKey, AWSSecretKey used?
Tabarak Hussain7y ago
Please upload code or send me, because I am unable to use code properly, getting errors
Dawood Abbas7y ago
When Iam trying to upload like your code then iam getting below error..Message = "The authorization mechanism you have provided is not supported. Please use AWS4-HMAC-SHA256."
satish kumar8y ago
When i upload image file from local host it uploaded successfully but after publish the code into amazon lamda and upload the image it corrupted and show small square box
shine naylinoo8y ago
Hello Joseph, thanks for the fantastic tutorial. I'm following your example in my web service to put the files to S3. It works locally, but having security issue after I deployed into GoDaddy hosting. I tried to use the hard code for AccessKey and SecurityKey in the class declaration for AmazonS3Client. But it also work locally and having same error after deployment. Do you have any idea for this issue?? Thanks in advance :)
Osvaldo Maria8y ago
Thanks for the tutorial.. worked out great for me
Kapil Sharma8y ago
Hello i am trying with same code but getting exception as access is denied. I have applied correct secret token and access key
- Joseph Thomas8y ago
  Please check if you have created bucket policy correctly....
Marco Baccaro9y ago
Joseph, let me introduce you the string.IsNullOrEmpty() and string.Concat to contribute in your example.
Kashif Asif9y ago
Nice article keep it up (y)

Introduction

In this article, I will show you how to upload a file (image/video/..) to Amazon S3 Bucket through an ASP.NET web application. For this, first, you need to have an AWS account in Amazon Web Services. You can create an AWS free tier account that's valid for 12 months. Visit this link to know more about a free tier account.

After signing into the AWS account, the next thing you need is to create security credentials for your account which will create a secret access key Id and secret access key. The below images show how to do this.

Account name> My Security Credentials.

Continue to Security Credentials.

Click (+) Acess Keys> create New Access Key button > download the key file or take note of your id and key somewhere.

Next, create an S3 Bucket. Click the "Services" tab and select S3 under the Storage division. This will take you to Amazon S3 page. On clicking the "Create" button, the following pop up will come up. Give a bucket name and select a region. Click "Next" and allow the public to read it.

Now, we need to create a bucket policy that allows us to create rules for managing access to our buckets and files.

Select your bucket > Permission tab > Bucket Policy > Policy Generator.

This will take you to a new page. Fill in the details as per your requirement. I have selected two actions - putobject and getobject. And in ARN, give your bucket name such as ‘test73’.

Clicking "Add Statement" will enable a new button ‘Policy Generator’. Click that button, copy, and paste the generated policy back in your bucket policy.

Click "Save". Now, you are done with all Amazon settings. The next step is to create an ASP.NET Application.

Open Visual Studio, and go to File > New > website > ASP.NET Empty web Site. Give a project name and click OK.

Add a new webform (empty) to your project. Now, we need to add two references - AWSSDK.Core and AWSSDK.S3 to our project. Open NuGet Package Manager in VS and search awssdk.

Download these two references to your project.

Now, add a fileupload control and a button control to your webform. The code for the webform is shown below.

using System;
using System.IO;
namespace awsTestUpload
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void upload(string path,string file)
{
}
protected void Button2_Click(object sender, EventArgs e)
{
Stream st = FileUpload1.PostedFile.InputStream;
string name = Path.GetFileName(FileUpload1.FileName);
string myBucketName = "test73"; //your s3 bucket name goes here
string s3DirectoryName = "";
string s3FileName = @name;
bool a;
AmazonUploader myUploader = new AmazonUploader();
a = myUploader.sendMyFileToS3(st, myBucketName, s3DirectoryName, s3FileName);
if (a == true)
{
Response.Write("successfully uploaded");
}
else
Response.Write("Error");
}
}
}

Now, right click on your project name in Solution Explorer and add a new class. I have named it AmazonUploader.cs.

The code for AmazonUploader.cs will be like below.

using Amazon.S3;
using Amazon.S3.Transfer;
namespace awsTestUpload
{
public class AmazonUploader
{
public bool sendMyFileToS3(System.IO.Stream localFilePath, string bucketName, string subDirectoryInBucket, string fileNameInS3)
{
IAmazonS3 client = new AmazonS3Client(RegionEndpoint.APSouth1);
TransferUtility utility = new TransferUtility(client);
TransferUtilityUploadRequest request = new TransferUtilityUploadRequest();
if (subDirectoryInBucket == "" || subDirectoryInBucket == null)
{
request.BucketName = bucketName; //no subdirectory just bucket name
}
else
{ // subdirectory and bucket name
request.BucketName = bucketName + @"/" + subDirectoryInBucket;
}
request.Key = fileNameInS3; //file name up in S3
request.InputStream = localFilePath;
utility.Upload(request); //commensing the transfer
return true; //indicate that the file was sent
}
}
}

Now, you have to set your AWS Secret Key Id and Secret Key in your webconfig file. Place the following code under <configurations> tag in webconfig file.

<appSettings>
<add key="AWSProfileName" value="Profile Name" />
<add key="AWSAccessKey" value=" Your Secret Key Id " />
<add key="AWSSecretKey" value="Your Secret Key " />
<!--AWSProfileName is used to reference an account that has been registered with the SDK.
If using AWS Toolkit for Visual Studio then this value is the same value shown in the AWS Explorer.
It is also possible to register an account using the <solution-dir>/packages/AWSSDK-X.X.X.X/tools/account-management.ps1 PowerShell script
that is bundled with the nuget package under the tools folder.
<add key="AWSProfileName" value="" />
-->
</appSettings>

If you want to upload large files, add the following settings too in webconfig file all under <configuration> tag.

<system.web>
<compilation debug="true" targetFramework="4.6" />
<httpRuntime targetFramework="4.6" maxRequestLength="1048576" executionTimeout="3600" />
<pages>
<controls>
<add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" />
</controls>
</pages></system.web>
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="1073741824" />
</requestFiltering>
</security>
</system.webServer>

That’s it. Now, run the project.

Output

Uploaded file in S3