How to get previous page content/full html on next/current page

  Page1.aspx :

<table border="1">
            <tr>
                <th>
                    S.No
                </th>
                <th>
                    Name
                </th>
            </tr>
            <tr>
                <td>
                    1
                </td>
                <td>
                    <span style='color: red'>Hello, Mr Bhasker </span>
                </td>
            </tr>
            <tr>
                <td>
                    2
                </td>
                <td>
                    <span style='color: red'>Hello, Mr Trilok </span>
                </td>
            </tr>
            <tr>
                <td>
                </td>
                <td>
                    <asp:Button ID="Button1" runat="server" PostBackUrl="~/Default3.aspx" Text="Next Page" />
                </td>
            </tr>
        </table>

Page2.aspx :

 <div>
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />   
    </div>


Page2.aspx.cs :

protected void Button1_Click(object sender, EventArgs e)
    {
        System.IO.StringWriter Orderwriter = new System.IO.StringWriter();
        System.Web.HttpContext.Current.Server.Execute("Page1.aspx", Orderwriter);
        string mBody = Orderwriter.ToString();
    }