How to include the selected criteria in the generated report's header?

Question

Prior to the generating of my report, I prompt the user to select six criteria/parameters--three data-driven dropdowns (each set to allow multiple values), one static dropdown, and starting and ending dates. I would like to include all of the selected criteria in the generated report's header. Is that possible?

How to display report's selection criteria gave me some pointers, but I didn't have much success. When I add a textbox to the header and define it to use:

• the .Label of one of my data-driven dropdown's parameters (i.e., "=Parameters!ParamTerritoryCode.Label"), BIDS displays a "The Value expression used in textrun "Textbox12.Paragraphs[0].TextRuns[0]' returned a data type that is not valid" warning but allows me to proceed. The generated report, however, displays "#Error" in the textbox.
• the .Value of the same parameter (i.e., "=Parameters!ParamTerritoryCode.Value"), BIDS displays the same error and the same "#Error" in the generated report's textbox.
• the .Value(0) of the same parameter (i.e., "=Parameters!ParamTerritoryCode.Value(0)"), BIDS displays the same error but displays only the first selected item in the corresponding dropdown. Since the user can select more than one value -- including the "(Select All") value -- I'm not sure how to effectively display the criteria in the generated report's textbox.

Any suggestions?

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Chris