两个dropDownList和一个GridView的选择与显示

很久没有写ASP.NET了，今天有看到论坛上一个问题：
"两个dropDownList和一个GridView，已经进行了数据绑定，现在想让第一个下拉菜单的数据改变时，第二个下拉菜单自动变到相应的数据，同时选中gridview中相对应的行，不知道如何实现，很急，求大神相助"



其实，实现起来算得上简单，下面先从准备数据开始，创建一个对象Customer:

source code:

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

/// <summary>
/// Summary description for Customer
/// </summary>
namespace Insus.NET
{
    public class Customer
    {
        private int _CustomerID;
        private string _CustomerName;
        private string _PID;
        private bool _IsActived;

        public int CustomerID
        {
            get { return _CustomerID; }
            set { _CustomerID = value; }
        }
        public string CustomerName
        {
            get { return _CustomerName; }
            set { _CustomerName = value; }
        }
        public string PID
        {
            get { return _PID; }
            set { _PID = value; }
        }
        public bool IsActived
        {
            get { return _IsActived; }
            set { _IsActived = value; }
        }
    }
}

View Code