public void AddRecipientVariable(string recipient, string name, string content)
        {
            if (MergeVars == null)
            {
                MergeVars = new List<RecipientMergeVariables>();
            }

            var entry = MergeVars.FirstOrDefault(e => e.Recipient == recipient);
            if (entry == null)
            {
                entry = new RecipientMergeVariables{Recipient = recipient};
                MergeVars.Add(entry);
            }

            var mv = new MergeVariable
                {
                Name = name,
                Content = content
            };

            entry.MergeVariables.Add(mv);
        }
        public void AddGlobalVariable(string name, string content)
        {
            if (GlobalMergeVars == null)
            {
                GlobalMergeVars = new List<MergeVariable>();
            }

            var mv = new MergeVariable
                {
                Name = name,
                Content = content
            };
            GlobalMergeVars.Add(mv);
        }