关于c＃：在所选数据源上找不到名为“OrderID”的字段或属性

A field or property with the name 'OrderID' was not found on the selected data source

在ASP.NET中处理多级网格视图，不断地得到这个错误。绑定列表导致此错误。GridViewOrder未获取orderID属性，但我已对其进行了定义。

课程代码为：

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public class Customer
{
public List<Order> Orders { get; set; }
}

调用内部网格的函数是：

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protected void GridViewCustomer_RowDataBound(object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
string customerID = GridViewCustomer.DataKeys[e.Row.RowIndex].Value.ToString();
GridView GridViewOrders = (GridView)e.Row.FindControl("GridViewOrders");
var lstOrders = from orders in SortCustomer()
where orders.CustomerID == customerID
select orders.Orders;
GridViewOrders.DataSource = lstOrders.ToList();
GridViewOrders.DataBind(); // This line generating error
}
}

ASPX代码如下：