附件Dynamic.cs：
关键代码：
using System.Linq.Dynamic;
......
......
if (ddl_Vehicle.SelectedValue == "ASC")
{
lvVehicle.DataSource = bll.QueryCusVehInfo().OrderBy(tb_value.Text);
}
else
{
lvVehicle.DataSource = bll.QueryCusVehInfo().OrderBy(tb_value.Text + " descending");
}