I have added a Drop-Down list Form Control to one of my page types in the field editor of Kentico 11.
In the section where it asks me to create a Data Source, can I pull some data from a database outside of Kentico?
You won't be able to do it with the built-in one because it will only execute query against the database the system is connected to defined in the web.config file.
Your best option is to create a custom form control which you can make the external database call to get Example - Developing custom form controls
Well you need to combine to 2 existing controls: Connection string selector (shows list from your connection string section of your web.config) and Drop-down list.
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