public static ContractNumberModel ToContractNumberModel(this ContractNumber cn)
        {
            var model = new ContractNumberModel()
            {
                Id         = cn.Id,
                CustomerId = cn.CustomerId,
                Desc       = cn.Desc,
                Name       = cn.Name
            };

            return(model);
        }
        public static ContractNumber ToContractNumberModel(this ContractNumberModel model)
        {
            var cn = new ContractNumber()
            {
                Id         = model.Id,
                CustomerId = model.CustomerId,
                Desc       = model.Desc,
                Name       = model.Name
            };

            return(cn);
        }