Pulling Multiple Value with request.Querystring

I have a a process right now that only pass one value from a  Querystring, but Now  i need to pass a collection on Value from a Query string to a List Collection using C#. Example below

string.IsNullOrEmpty(request.QueryString.Get("HID")) ? MemID: request.QueryString.Get("HID");

This code need to be passed into a queryinput List Collection below

queryinput.ID = string.IsNullOrEmpty(request.QueryString.Get("HID")) ? MemID: request.QueryString.Get("HID");

I keep getting error Cannot implicitly type string to system.collection.Generic list<string>
DevoinITAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
can you please clarify on how you want to pass the "list" of values in the URL?
or, do you actually want to create a "list" with 1 single value, to start with?

in second case, it would be:
List<string> l = new List<string>();
l.Add(string.IsNullOrEmpty(request.QueryString.Get("HID")) ? MemID: request.QueryString.Get("HID") );
queryinput.ID = l; 

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hope this helps

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DevoinITAuthor Commented:
This will work fine. I just wanted to place the Querystring values in a list collection and pass the list collection into another list collection.

queryinput.ID - List Collection

List Collection
List<string> l = new List<string>();
l.Add(string.IsNullOrEmpty(request.QueryString.Get("HID")) ? MemID: request.QueryString.Get("HID") );
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