Trying to string.Join an IList

I'm trying to implement the first example http://www.dotnetperls.com/convert-list-string into my method but I'm having a hard time matching the 2nd argument for the method: ``` string printitout = string.Join(",", test.ToArray<Location>); ``` error message: ``` The best overloaded method match for 'string.Join(string, System.Collections.Generic.IEnumerable<string>)' has some invalid arguments ``` All the IList interfaces are implemented with the IEnurmerable too (just not listed here unless someone wants me to). ``` class IList2 { static void Main(string[] args) { string sSite = "test"; string sSite1 = "test"; string sSite2 = "test"; Locations test = new Locations(); Location loc = new Location(); test.Add(sSite) test.Add(sSite1) test.Add(sSite2) string printitout = string.Join(",", test.ToArray<Location>); //having issues calling what it needs. } } string printitout = string.Join(",", test.ToArray<Location>); public class Location { public Location() { } private string _site = string.Empty; public string Site { get { return _site; } set { _site = value; } } } public class Locations : IList<Location> { List<Location> _locs = new List<Location>(); public Locations() { } public void Add(string sSite) { Location loc = new Location(); loc.Site = sSite; _locs.Add(loc); } } ``` Edit: Ok using "string.Join(",", test);" works, before I close this with a check mark, for some reason my output, outputs: "Ilistprac.Location, Ilistprac.Location, Ilistprac.Location" for some reason instead of what's in the list.