Master Page
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<asp:ContentPlaceHolder
ID="head"
runat="server">
</asp:ContentPlaceHolder>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="lbloutcp"
runat="server"
Text="Basic"></asp:Label>
<br />
<asp:ContentPlaceHolder
ID="ContentPlaceHolder1"
runat="server">
</asp:ContentPlaceHolder>
</div>
</form>
</body>
</html>
Page with Master:
.aspx
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<br />
<asp:TextBox ID="TextBox1"
runat="server">
</asp:TextBox><br />
<asp:Button ID="Button1"
runat="server"
Text="Button"
OnClick="Button1_Click"
/>
<br />
<div>
<asp:Label ID="lblincp"
runat="server"
Text="Basic"></asp:Label>
</div>
</asp:Content>
.aspx.cs:
protected void
Button1_Click(object sender, EventArgs e)
{
string text = TextBox1.Text;
Label lbl = (Label)Master.FindControl("lbloutcp");
lbl.Visible = true;
lbl.Text = text + " Master Page Place
holder";
ContentPlaceHolder cph = (ContentPlaceHolder)Master.FindControl("ContentPlaceHolder1");
Label lbl2 = (Label)cph.FindControl("lblincp");
lbl2.Visible = true;
lbl2.Text = text + " In Content Place
holder";
}