母版页与内容页的控件之间的访问

ASP.NET 2.0比以前版本的一个较大的改进，就是提供了母版页。那么它与内容页之间是怎么通讯的呢，可以参照如下事例，就能够实现其功能(代码很简单，就不加注释了 源代码下载)：

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;

// Master页面
public partial class MasterPage:System.Web.UI.MasterPage
... {
protectedvoidPage_Load(objectsender,EventArgse)
...{

}
protectedvoidbtnMaster_Click(objectsender,EventArgse)
...{
Labellbl=this.ContentPlaceHolder1.FindControl("lblContent")asLabel;
Response.Write("<scriptlanguage='javascript'>alert('"+lbl.Text+"');</script>");
}
}

内容页面如下：

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;

// 内容页面
public partial class Default2:System.Web.UI.Page
... {
protectedvoidPage_Load(objectsender,EventArgse)
...{

}
protectedvoidbtnContent_Click(objectsender,EventArgse)
...{
Labellbl=this.Page.Master.FindControl("lblMaster")asLabel;
Response.Write("<scriptlanguage='javascript'>alert('"+lbl.Text+"');</script>");
}
}