var cars = new List<Car>() {
                new Car { CarId=Guid.NewGuid(), Make="BMW", Model="528i", Year=2010 },
                new Car {CarId=Guid.NewGuid(), Make="Toyota", Model="4Runner", Year=2010},
                new Car {CarId=Guid.NewGuid(), Make="Hyundai", Model="Elantra", Year=2013}
            };

            GridView1.DataSource = cars;
            GridView1.DataBind();

        }

        protected void GridView1_RowCommand( object sender, GridViewCommandEventArgs e )
        {

            int index = Convert.ToInt32(e.CommandArgument);
            GridViewRow row = GridView1.Rows[index];

            //This is a bit risky take great caution
            var make = row.Cells[1].Text;
            var model = row.Cells[2].Text;
            var value = row.Cells[4].Text;

            //You probably want to convert to its original type
            var carId = Guid.Parse(value);

            resultLabel.Text = String.Format("{0} {1} {2}",
                make,
                model,
                carId);


        }
    }