Dynamic content is deprecated in Optimizely Content Management System (CMS 12). Use blocks instead. While existing solutions will continue to work, you should not build new solutions on this API. It will be phased out in the future.
If you use the `
DynamicContentPlugIn` attribute, you do not need to manually register your plug-in in this way. If you do not use the attribute, you need to register the plug-in in the **episerver** section of _web.config_ as shown in the following example: