Using asp:content markup more than once in the masterpage

<%@ Page Language="C#" MasterPageFile="~/default.master" Title="My Content Title" %>

<h1><%= this.Page.Title %></h3>

public void SetPageTitle(string title)
{
    pageTitle.Text = title;
    sameTitle.Text = title;
}

((MyMasterPage) Master).SetPageTitle("My content page");

Master.SetPageTitle("My content page");