Convert protobuf to base64

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using System; using p = Google.Protobuf;   namespace TestProtobuf {     class MainClass     {         public static void Main(string[] args)         {                 var c = new Person             {                 FirstName = "Anders", LastName = "Hejlsberg"             };                 int n = c.CalculateSize();             var ba = new byte[n];               var os = new p.CodedOutputStream(ba);               c.WriteTo(os);               var s = Convert.ToBase64String(ba);               Console.WriteLine(s);         }     } }