I'm sorry but I don't have a lot of experience using the same type of server-side code that you're using....I hope what I'm about to suggest is valid (I think it should be). Jhardman please feel free to correct me at any time....
The value passed to you is a string that is "delimited" (separated) by the "," character.
To keep things simple you could split this string on the "," using the String.Split() method. The String.Split() method returns an array of strings.
For example if you had a string like:
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Dim myString = "John Smith, Gerry Kaine, Jennifer Hilton"
And you used the String.Split(",") method:
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Dim names() = myString.Split(",")
The names array would be as follows:
["John Smith", "Gerry Kaine", "Jennifer Hilton"]
Note how there is no ","s in the array...just the values that were separated by the commas.
Now you can use that array to do further manipulations on the names in the array.
-Frinny