protected void Page_Load(object sender, EventArgs e) { List<Project> list=new List<Project>() { new Project() { Name = "aa",Price = 23.5 }, new Project() { Name = "aa",Price = 23.5 }, new Project() { Name = "aa",Price = 23.5 }, new Project() { Name = "aa",Price = 23.5 }, new Project() { Name = "aa",Price = 23.5 }, new Project() { Name = "aa",Price = 23.5 }, new Project() { Name = "aa",Price = 23.5 }, new Project() { Name = "aa",Price = 23.5 }, new Project() { Name = "aa",Price = 23.5 } }; Response.Write(list.Sum(p => p.Price)); }