by default, you can bind to an item in the array, if the array items are the same type as your property. In your case, if your property was of type User, then you could bind to the Nth item in the array.
However, if you go into the designer.cs file for your workflow, you can edit the binding path so that you bind to the Nth User and then select the UserName property.
activitybind1.Name = "Workflow1;
activitybind1.Path = "Users[0].UserName";
Matt
See What You Can Learn -- http://www.pluralsight.com/courses/IntroducingWF.aspx |