温故知新ASP.NET 2.0(C#)(1) - MasterPage(母版页)

using System; 
using System.Data; 
using System.Configuration; 
using System.Collections; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 
 
public partial  class MasterPage_Test : System.Web.UI.Page 
{ 
         protected  void Page_Load( object sender, EventArgs e) 
        { 
                 // 在内容页用FindControl方法找到内容页中的控件 
                DropDownList ddl =  new DropDownList(); 
                ddl = Master.Master.FindControl( "ContentPlaceHolder1").FindControl( "cph").FindControl( "ddlPage")  as DropDownList; 
                Master.Master.FindControl( "ContentPlaceHolder1").FindControl( "cph").Controls.Add( new LiteralControl( "<br />内容页中的DropDownList的ClientID是：" + ddl.ClientID)); 
 
                 // 增加一个事件处理，该事件是在母版页定义的一个公共事件 
                Master.SelectedIndexChanged_ddlMaster +=  new CommandEventHandler(Master_SelectedIndexChanged_ddlMaster); 
        } 
 
         void Master_SelectedIndexChanged_ddlMaster( object sender, CommandEventArgs e) 
        { 
                 // CommandEventArgs已经在母版页中的公共事件“SelectedIndexChanged_ddlMaster”中指定 
                 string selectedText = e.CommandName; 
                 string selectedValue = e.CommandArgument.ToString(); 
 
                ddlPage.SelectedValue = selectedValue; 
        } 
 
         protected  void ddlPage_SelectedIndexChanged( object sender, EventArgs e) 
        { 
                 // 调用母版页的方法 
                Master.SetddlMaster(ddlPage.SelectedIndex); 
        } 
}