public class Book
    {
        public int ContractId { get; set; }
        public string Name { get; set; }
        public string Author { get; set; }
        public int Year { get; set; }
        public int Price { get; set; }
    }

public string GetData()
        {
            List<Book> books=new List<Book>();
            books.Add(new Book { ContractId = 1, Name = "Война и мир", Author = "Л. Толстой", Year = 1863, Price = 220 });
            books.Add(new Book { ContractId = 2, Name = "Отцы и дети", Author = "И. Тургенев", Year = 1862, Price = 195 });
            books.Add(new Book { ContractId = 3, Name = "Чайка", Author = "А. Чехов", Year = 1895, Price = 158 });
            books.Add(new Book { ContractId = 4, Name = "Подросток", Author = "Ф. Достоевский", Year = 1875, Price = 210 });

            return JsonConvert.SerializeObject(books);         
        }

<table id="jqg" style="margin:auto"></table>
    <div id="jpager"></div>

    <script type="text/javascript">        
        $("#jqg").jqGrid({
            url: '@Url.Action("/GetData")',
            datatype: "json",
            mtype: "GET",         
            height: "auto",
            caption: "Список книг",
            loadonce: true, 
            colNames: ['№', 'Название'],
            colModel: [
                { name: 'ContractId', index: 'ContractId', width: 130, stype: 'text' },
                { name: 'Name', index: 'Name', width: 150, sortable: true },
            ]
        });
    </script>

[{"ContractId":1,"Name ":"Война и мир","Author":"Л. Толстой","Year":1863,"Price":220},
{"ContractId":2,"Name ":"Отцы и дети","Author":"И. Тургенев","Year":1862,"Price":195},
{"ContractId":3,"Name ":"Чайка","Author":"А. Чехов","Year":1895,"Price":158},
{"ContractId":4,"Name ":"Подросток","Author":"Ф. Достоевский","Year":1875,"Price":210}]