We have set custom environment variables in the Elastic Beanstalk dashboard, under configuration=>software configuration=>\"Environment Properties\" section. In a C# MVC 5 proje
Previously, Elastic Beanstalk didn't support passing environment variables to .NET Core applications and multiple-application IIS deployments that use a deployment manifest [1]. The Elastic Beanstalk Windows Server platform update on June 29, 2020 [2] now fixes this gap. For details, see Configuring your .NET environment in the Elastic Beanstalk console [3].
[1] https://docs-aws.amazon.com/elasticbeanstalk/latest/dg/dotnet-manifest.html
[2] https://docs.aws.amazon.com/elasticbeanstalk/latest/relnotes/release-2020-06-29-windows.html
[3] https://docs-aws.amazon.com/elasticbeanstalk/latest/dg/create_deploy_NET.container.console.html#dotnet-console