# Configuring .NET containers using the Amazon toolkit for Visual Studio
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 The **Container/.NET Options** panel lets you fine-tune the behavior of your Amazon EC2 instances and enable or disable Amazon S3 log rotation. You can use the Amazon Toolkit for Visual Studio to configure your container information.

**Note**  
You can modify your configuration settings with zero downtime by swapping the CNAME for your environments. For more information, see [Blue/Green deployments with Elastic Beanstalk](using-features.CNAMESwap.md).

If you want to, you can extend the number of parameters. For information about extending parameters, see [Option settings](ebextensions-optionsettings.md).

**To access the Container/.NET options panel for your Elastic Beanstalk application**

1. In Amazon Toolkit for Visual Studio, expand the Elastic Beanstalk node and your application node. 

1. In **Amazon Explorer**, double-click your Elastic Beanstalk environment.

1. At the bottom of the **Overview** pane, click the **Configuration** tab.

1. Under **Container**, you can configure container options.   
![Elastic Beanstalk container panel](http://docs.amazonaws.cn/en_us/elasticbeanstalk/latest/dg/images/aeb-vs-container.png)

## .NET container options
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You can choose the version of .NET Framework for your application. Choose either 2.0 or 4.0 for **Target runtime**. Select **Enable 32-bit Applications** if you want to enable 32-bit applications.

## Application settings
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The **Application Settings** section lets you specify environment variables that you can read from your application code. 

![Elastic Beanstalk container panel](http://docs.amazonaws.cn/en_us/elasticbeanstalk/latest/dg/images/aeb-vs-container-envproperties.png)