Master Pages and Factory Pattern

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Pages_Default : System.Web.UI.Page
{
    private Base Orders;

    protected void Page_Load(object sender, EventArgs e)
    {
            Pages_MasterGrid myMaster = (Pages_MasterGrid)this.Master;
            myMaster.mainTitle = "Order Information";
            Orders = myMaster.myObject;
    }

    protected void Page_Init(object sender, System.EventArgs e)
    {
        Pages_MasterGrid myMaster = (Pages_MasterGrid)this.Master;
        myMaster.GridChanged +=  FillControls;
        myMaster.ChildGridChanged +=FillChildInfo;
        
    }

    protected void FillControls(object sender, MasterGridEventArgument e)
    {
        MultiView1.ActiveViewIndex = 0;
        DataSet dsOrders ;
        if (Session["Orders"] == null)
        {
            dsOrders = Orders.getParentData();
            Session.Add("Orders", dsOrders);
        }
        else
        {
            dsOrders = (DataSet)Session["Orders"];
        }
        ClearView();
        FillView(View1, dsOrders.Tables["orders"].Select("OrderID = " + e.ParentGridInfo));
    }

    protected void FillChildInfo(object sender, DetailGridEventArgument e)
    {
        MultiView1.ActiveViewIndex = 1;
        //MenuImageChange(1);
        DataSet dsProduct = Orders.getChildData(e.ParentGridInfo);
        if (dsProduct == null)
        {
            ClearView(View2);
        }
        else
        {
            FillView(View2, dsProduct.Tables["Products"].Select("ProductID = " + e.detailGridInfo));
        }
    }

    public static void FillView(View view, DataRow[] dr)
    {
        foreach (Control control in view.Controls)
        {
            if (control.GetType() == typeof(TextBox))
            {
                string fieldName = control.ID.Trim();
                GeneralFunctions.SetTextBoxValue((TextBox)control, dr[0][fieldName]);
            }
        }
    }

    public void ClearView(View view)
    {
        foreach (Control control in view.Controls)
        {
            if (control.GetType() == typeof(TextBox))
            {
                GeneralFunctions.SetTextBoxValue((TextBox)control, "");
            }
            else if (control.GetType() == typeof(CheckBox))
            {
                GeneralFunctions.SetCheckBoxValue((CheckBox)control,false);
            }
        }
    }

    public void ClearView()
    {
        foreach (View view in MultiView1.Views)
        {
            ClearView(view);
        }
        
    }

}