ASP.NET กับแนวคิดการออกแบบ WebPage การวาง Layout ของหน้าเว็บและการเปลี่ยน URL

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim objCtrl As Control
        Dim strPage As String
        strPage = Request.QueryString("page")

        Select Case strPage
            Case "service"
                objCtrl = LoadControl("~/PageService.ascx")
                Exit Select
            Case "aboutus"
                objCtrl = LoadControl("~/PageAboutUs.ascx")
                Exit Select
            Case "contactus"
                objCtrl = LoadControl("~/PageContactUs.ascx")
                Exit Select
            Case Else
                objCtrl = LoadControl("~/PageHome.ascx")
                Exit Select
        End Select

        Me.pnlContainer.Controls.Add(objCtrl)
    End Sub

protected void Page_Load(object sender, System.EventArgs e)
{
	Control objCtrl = default(Control);
	string strPage = null;
	strPage = Request.QueryString("page");

	switch (strPage) {
		case "service":
			objCtrl = LoadControl("~/PageService.ascx");
			break; 

		case "aboutus":
			objCtrl = LoadControl("~/PageAboutUs.ascx");
			break; 

		case "contactus":
			objCtrl = LoadControl("~/PageContactUs.ascx");
			break; 

		default:
			objCtrl = LoadControl("~/PageHome.ascx");
			break;
	}

	this.pnlContainer.Controls.Add(objCtrl);
}