Introduction:

Serverless web applications have become increasingly popular in recent years due to their scalability, cost-effectiveness, and ease of deployment. AWS Lambda, Amazon's serverless computing service, has been widely adopted for building serverless applications. With .NET Core, developers can build serverless web applications on AWS Lambda using C# or other .NET languages.

This article will explore how to build serverless web applications with AWS Lambda and .NET Core. We will cover the following topics:

1. What is AWS Lambda?
2. What is .NET Core?
3. Building and deploying a serverless web application with AWS Lambda and .NET Core.

What is AWS Lambda?

AWS Lambda is a computing service that lets you run code without provisioning or managing servers. You only pay for the computing time that you consume - there is no charge when your code is not running. AWS Lambda supports multiple programming languages including C#, Python, Node.js, and Java.

AWS Lambda allows you to build serverless applications that can handle a large number of requests without worrying about the infrastructure. It also enables you to easily integrate with other AWS services such as API Gateway, S3, DynamoDB, and more.

What is .NET Core?

.NET Core is a free, open-source, and cross-platform framework for building modern applications. It supports multiple programming languages including C#, F#, and VB.NET. .NET Core is designed to be lightweight, modular, and scalable.

.NET Core allows you to build web applications that can run on Windows, Linux, or macOS. It also includes libraries and tools for building cloud-native applications.

Building and deploying a serverless web application with AWS Lambda and .NET Core:

To build a serverless web application with AWS Lambda and .NET Core, we will use the following components:

• AWS Lambda function
• API Gateway
• .NET Core application

Step 1: Create a new .NET Core application

First, we need to create a new .NET Core application. We can do this by using the following command:

dotnet new webapi -n MyServerlessWebApp

This command creates a new .NET Core web application with the name "MyServerlessWebApp".

Step 2: Create a new AWS Lambda function

Next, we need to create a new AWS Lambda function. We can do this by using the following steps:

• Log in to the AWS Management Console.
• Go to the AWS Lambda console.
• Click on "Create function".
• Select "Author from scratch".
• Enter a name for the function.
• Select the runtime as ".NET Core 3.1".
• Click on "Create function".

Step 3: Configure the AWS Lambda function

Once the AWS Lambda function is created, we need to configure it. We can do this by using the following steps:

• Go to the "Configuration" tab.
• Click on "Edit" under "Function code".
• Select "Upload a .zip file".
• Upload the .zip file of the .NET Core application.
• Set the "Handler" field to the name of the DLL that contains the Lambda function.
• Click on "Save".

Step 4: Create an API Gateway

Next, we need to create an API Gateway. We can do this by using the following steps:

• Go to the API Gateway console.
• Click on "Create API".
• Select "REST API".
• Click on "Build".
• Select "New API".
• Enter a name for the API.
• Click on "Create API".

Step 5: Configure the API Gateway

Once the API Gateway is created, we need to configure it. We can do this by using the following steps:

• Select "Create Resource" to create a new resource.
• Enter a name for the resource.
• Select "Create Resource".
• Select the newly created resource.
• Select "Create Method".
• Select the HTTP method you want to use (e.g. GET or POST).
• Select "Lambda Function" as the integration type.
• Select the AWS Lambda function that you created earlier.
• Click on "Save".

Step 6: Deploy the API Gateway

Once the API Gateway is configured, we need to deploy it. We can do this by using the following steps:

• Select "Actions" and then "Deploy API".
• Select the deployment stage (e.g. "Prod").
• Click on "Deploy".

Step 7: Test the serverless web application

Now that the serverless web application is deployed, we can test it by using the URL provided by the API Gateway. We can do this by using the following steps:

• Go to the API Gateway console.
• Select the API that you created.
• Select the deployment stage that you deployed to.
• Copy the URL provided by the API Gateway.
• Open a web browser and paste the URL.
• The web application should be displayed in the browser.

Conclusion:

In conclusion, building serverless web applications with AWS Lambda and .NET Core can be a powerful and cost-effective way to build scalable and highly available applications. AWS Lambda allows you to focus on your code without worrying about the underlying infrastructure, and .NET Core provides a modern and flexible framework for building web applications. With these technologies, you can quickly and easily build serverless web applications that can handle a large number of requests and provide a great user experience.