I have a property on my control that is of type string[]. What designer can I use to allow ASP.NET developers to add or remove strings to this array?

The best book for control building is Nikhil's Controls book:

Developing Microsoft ASP.NET Server Controls and Components

For what you want to do with a string array, I found this walkthrough that I believe does what you want, step-by-step:

Walkthrough: Serializing Collections of Standard Types with the DesignerSerializationVisibilityAttribute

Hope that helps and Good Luck!

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Steven A Smith
President, AspAlliance LLC
CIO, Lake Quincy Media, LLC