Asp.net 我无法从UserControl的代码隐藏访问UserControl中的控件

我有一个Asp.Net用户控件。它有一个网格视图

但我无法在UserControl的代码隐藏中访问此GridView

这是什么原因

谢谢你的回答

OrdersControl.ascx：

    <%@ Control Language="C#" AutoEventWireup="true" CodeFile="~/Controls/OrdersControl.ascx.cs" CodeBehind="OrdersControl.ascx.cs" Inherits="EntityApp.Controls.OrdersControl"%>
<asp:GridView ID="GridView1" runat="server"></asp:GridView>

---

}

访问GridView1时出错，实际的错误消息是什么？向我们展示OrdersControl.ascx.cs的命名空间和类声明。非常感谢。我决定：

    protected void Page_Load(object sender, EventArgs e)
    {
        NorthwindEntities = new NorthwindEntities();

        GetOrders();
    }

    private void GetOrders()
    {
        var orders = (from order in NorthwindEntities.Orders
                      join customer in NorthwindEntities.Customers on order.CustomerID equals customer.CustomerID
                      join employee in NorthwindEntities.Employees on order.EmployeeID equals employee.EmployeeID
                      join shipper in NorthwindEntities.Shippers on order.ShipVia equals shipper.ShipperID
                      select new
                      {
                          order.OrderID,
                          order.OrderDate,
                          order.RequiredDate,
                          order.ShippedDate,
                          customer.CompanyName,
                          customer.ContactName,
                          customer.City,
                          customer.Phone,
                          employee.FirstName,
                          employee.LastName,
                          shipperCompany = shipper.CompanyName,
                          shipperPhone = shipper.Phone
                      }).ToList();

        GridView1.DataSource = orders;//Error is in here
        GridView1.DataBind();//Error is in here
    }
}