GridView中TextBox 有内容，选中当前行CheckBox

问题：

平台：visual studio 2008
要求：gridview中当前行<asp:TextBox></asp:TextBox>有值时，对应的<asp:CheckBox></asp:CheckBox>自动勾选（离开文本框时判断也行）

参考：http://images.cnblogs.com/cnblogs_com/insus/textchangecheckbox.PNG

Insus.NET解决效果：

Order类别：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

/// <summary>
/// Summary description for Orders
/// </summary>
namespace Insus.NET
{
    public class Order
    {
        private int _Order_nbr;

        public int Order_nbr
        {
            get { return _Order_nbr; }
            set { _Order_nbr = value; }
        }
        
        public Order()
        {
            //
            // TODO: Add constructor logic here
            //
        }
    }
}

GridView Html代码：

<asp:GridView ID="GridViewOrders" runat="server" AutoGenerateColumns="false" Width="330px" OnRowCreated="GridViewOrders_RowCreated">
                <Columns>
                    <asp:TemplateField>
                        <HeaderTemplate>
                            Order Number
                        </HeaderTemplate>
                        <ItemTemplate>
                            <%# Eval("Order_nbr") %>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField>
                        <HeaderTemplate>
                            Selected
                        </HeaderTemplate>
                        <ItemTemplate>
                            <asp:CheckBox ID="CheckBoxSelected" runat="server" />
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField>
                        <HeaderTemplate>
                           Unit Price
                        </HeaderTemplate>
                        <ItemTemplate>
                            <asp:TextBox ID="TextBoxUnitPrice" runat="server"></asp:TextBox>
                        </ItemTemplate>
                    </asp:TemplateField>
                </Columns>
            </asp:GridView>

xxx.aspx.cs代码:

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Insus.NET;

public partial class _Default : System.Web.UI.Page
{
    List<Order> Orders = new List<Order>();

    protected override void OnInit(EventArgs e)
    {
        Order o1 = new Order();
        o1.Order_nbr = 1;
        Orders.Add(o1);

        Order o2 = new Order();
        o2.Order_nbr = 2;
        Orders.Add(o2);

        Order o3 = new Order();
        o3.Order_nbr = 3;
        Orders.Add(o3);

        base.OnInit(e);
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Data_Binding();
        }
    }

    private void Data_Binding()
    {
        this.GridViewOrders.DataSource = Orders;
        this.GridViewOrders.DataBind();
    }

    protected void GridViewOrders_RowCreated(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType != DataControlRowType.DataRow) return;

        if (e.Row.FindControl("TextBoxUnitPrice") != null)
        {
            var UnitPriceTextBox = e.Row.FindControl("TextBoxUnitPrice") as TextBox;
            UnitPriceTextBox.AutoPostBack = true;
            UnitPriceTextBox.TextChanged += UnitPriceTextBox_TextChanged;
        }
    }

    private void UnitPriceTextBox_TextChanged(object sender, EventArgs e)
    {
        var TextBox = sender as TextBox;
        GridViewRow gvr = (GridViewRow)TextBox.Parent.Parent;
        var cb = (CheckBox)this.GridViewOrders.Rows[gvr.RowIndex].FindControl("CheckBoxSelected");
        cb.Checked = string.IsNullOrEmpty(TextBox.Text.Trim()) ? false : true;
    }
}