A step-by-step guide to using environment variables in .NET Lambda functions on AWS. Covers creating a Lambda function with the dotnet CLI, reading environment variables via `Environment.GetEnvironmentVariable`, deploying with `dotnet lambda deploy-function`, setting variables using the AWS CLI, and invoking the function to verify output.

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Table of contents
1. Get the tools2. Create the Lambda function3. Update the function4. Deploy the function5. Set the environment variable for the Lambda function6. Invoke the function