请高手们帮帮忙？？谢谢！！！

Question

大家有用DropDownList有数据访问的二联动  、 三联动 、四联动的例子吗？？？  越详细越好！！越详细分越多哦！！！

Answer 1

http://www.zxbc.cn/html/20070419/2210.html(转）

Answer 2

将前3个dropdownlist的autopostback属性设为true; 
private   void   InitializeComponent() 
{         
                        this.DropDownList1.SelectedIndexChanged   +=   new   System.EventHandler(this.DropDownList1_SelectedIndexChanged); 
                        this.Load   +=   new   System.EventHandler(this.Page_Load);                 } private   void   DindDDLST(DropDownList   ddlst,string   parentid) 
                { 
                        string   sql   =   "select   *   from   table1   where   parentid   =   ' "   +   parentid   +   " ' "; 
                        //读取数据绑定ddlst 
                } 
                private   void   DropDownList1_SelectedIndexChanged(object   sender,   System.EventArgs   e) 
                { 
                        this.DropDownList2.Items.Clear(); 
                        this.DropDownList3.Items.Clear(); 
                        this.DropDownList4.Items.Clear(); 
                        DindDDLST(this.DropDownList2,this.DropDownList1.SelectedValue); 
                } 
如此类推； 2）修改前用ViewState记录所有选中的情况，保存后重新绑定； 
      或者不要重新绑定，而是保存成功后直接修改dropdownlist的当前item 
(源于高手写的)

Answer 3

省市区县(含全国完整数据库)Ajax无刷新三级联动

Answer 4

http://www.cnblogs.com/insus/archive/2011/07/04/2097059.html