private static void RenameCompany(string[] v) { string compName = v[0]; string newName = v[1]; if (!companies.ContainsKey(compName)) { Console.WriteLine("Could not RenameCompany"); return; } Company company = companies[compName]; try { company.RenameCompany(newName); companies.Remove(compName); companies.Add(newName, company); } catch (ArgumentException ex) { Console.WriteLine(ex.Message); } }