We added metadata columns to our content type, we added a document template that provides the common format for uploading project proposals to the library, and in this recipe we will add "Approval workflow" to our content type.
Approval Workflow is out-of-the-box workflow available in the SharePoint server.
You should have completed the previous recipes successfully.
Feature1.EventReceiver.csfile and add code to associate the workflow before the content type update method in the feature's activating method. Your code should look like the following: