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)：

usingSystem;
usingSystem.Data;
usingSystem.Configuration;
usingSystem.Collections;
usingSystem.Web;
usingSystem.Web.Security;
usingSystem.Web.UI;
usingSystem.Web.UI.WebControls;
usingSystem.Web.UI.WebControls.WebParts;
usingSystem.Web.UI.HtmlControls;

//Master页面
publicpartialclassMasterPage: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：

usingSystem;
usingSystem.Data;
usingSystem.Configuration;
usingSystem.Collections;
usingSystem.Web;
usingSystem.Web.Security;
usingSystem.Web.UI;
usingSystem.Web.UI.WebControls;
usingSystem.Web.UI.WebControls.WebParts;
usingSystem.Web.UI.HtmlControls;

//内容页面
publicpartialclassDefault2: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>");
}
}