Even with the limited capabilities of sandboxed solutions, you can still develop custom activities that can be used in SharePoint designer without making changes to
web.config or adding the
.ACTIONS file to the root folder.
In this recipe, we will create a custom activity that can be deployed in a sandboxed environment. This activity will create an event in the calendar for a given date.
The concepts of custom activities need to be understood before following this recipe. Hence you should have completed the previous recipe successfully.