Cross page posting asp.net

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Developer has to fetch details from parent page and send it to child page. Get values of previous page is known as Cross page posting in asp.net.By Cross page posting we can get values of previous page syntax is given as below:
Ex:- Page PrevPage = this.PreviousPage;

Parent Page:

<form id="form1" runat="server">
    <h1>Parent Page</h1>
    <asp:TextBox ID="txtname" runat="server"></asp:TextBox><br />
    <asp:Button ID="Button1" runat="server" Text="Button" PostBackUrl="Page2.aspx"/>
</form>

Child Page:

<form id="form1" runat="server">
    <h1>Child Page</h1>
    <asp:Label ID="lbldet1" runat="server" Text=""></asp:Label>
</form>

Inside Child page’s page_load event :

protected void Page_Load(object sender, EventArgs e)
{
    TextBox TextBox1 = (TextBox)Page.PreviousPage.FindControl("txtname");
    lbldet1.Text = TextBox1.Text;
}