public override void Execute() { var grouplist = _persistance.GetGroupList(); var groups = new List <string>(); foreach (Group group in grouplist) { string groupstring = string.Format("{0} ({1})", group.GroupName, group.Members.Count); groups.Add(groupstring); } string message = string.Join(", ", groups); Messages.Add("Displaying all groups with the total number of users:"); Messages.Add(message); }