Something like String.Join(",", new string[] { "a", "b" });, but for Guid[]

var guids = new Guid[] { Guid.Empty, Guid.Empty };

var str = /* Magic */

// str = 00000000-0000-0000-0000-000000000000,00000000-0000-0000-0000-000000000000
c# .net-3.5
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