Sorting dictionary object

        private void Form1_Load(object sender, EventArgs e)

        {

 

            var dictCompanies = new Dictionary<string, string[]>();

            dictCompanies.Add("4", new string[] { "Gra", "Gre" });

            dictCompanies.Add("3", new string[] { "Tro", "Tre" });

            dictCompanies.Add("1", new string[] { "Una", "Uni" });

            dictCompanies.Add("2", new string[] { "Doo", "DAA" });

 

            var fullList = dictCompanies.Keys.ToList();

            fullList.Sort();

 

            foreach (string sKey in fullList)

            {

                textBox1.Text += sKey + Environment.NewLine;

            }

 

        }