wpf - Page can have only Window or Frame as parent -

i want switch between wpf pages, getting above mentioned error:page can have window or frame parent. here code

imports system.windows.forms 

public class page1

private sub btn1_click(sender object, e routedeventargs) handles btn1.click     try          dim dd new page2           me.content = dd         me.txt1.text = (dd.txt10.text)     catch ex exception          txt1.text = ex.message     end try 

xaml file code

<page x:class="page2"   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"    mc:ignorable="d"    d:designheight="300" d:designwidth="300"   title="page2"> <grid>      <button x:name="button1" content="button" horizontalalignment="left" margin="163,62,0,0" verticalalignment="top" width="101" height="55"/>     <textbox x:name="txt10" horizontalalignment="left" height="23" margin="38,81,0,0" textwrapping="wrap" text="textbox" verticalalignment="top" width="120"/>  </grid> 

please guide me doing wrong?

based on name page1 assume page. put frame in page1 , load page2 frame.