public class MYDIC
    {
        public MYDIC(string s1, string s2)
        {
            this.s1 = s1;
            this.s2 = s2;
        }
        
        public string s1;
        public string s2;
    }

Dictionary<string, MYDIC> dic = new Dictionary<string, MYDIC>();
dic.Add("1", new MYDIC("1-1", "1-2"));
dic.Add("2", new MYDIC("2-1", "1-2"));
dic.Add("3", new MYDIC("3-1", "3-2"));