Implement Paging using ObjectDataSource with GridView

using System;
using System.Data;
using System.Configuration;
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;

/// <summary>
/// Represents Products data
/// </summary>
public class ProductsList
{
	public ProductsList()
	{
		//
		// TODO: Add constructor logic here
		//
	}
   
    public DataView GetProducts(int StartRow,int PageSize)
    {
       //this method Returns the Data from ProductsList.xml file
        
        //getdata() could be implemented to read from database as well
        return GetData(StartRow, PageSize);
    }

    private DataView GetData(int StartRow, int PageSize)
    {
        //this method reads data from xml file present in App_Code 
        DataSet Products = new DataSet();
        Products.ReadXml(HttpContext.Current.Server.MapPath("~/App_Data/ProductsList.xml"));
        
        DataTable ProductsTable= Products.Tables[0];

        //create new empty table to hold the resultant rows 
        DataTable PagedProductsTable = ProductsTable.Clone();
        //DataRow ProductsRow;

        //   i = NewPageIndex*PageSize gives us the starting row of new page
        for (int i = StartRow; i < StartRow + PageSize && i < ProductsTable.Rows.Count; i++)
        {
            //add the rows 
            PagedProductsTable.ImportRow(ProductsTable.Rows[i]);
        }
        return PagedProductsTable.DefaultView;
    }

    public int GetRowsCount()
    {
        //this method returns the total number of rows in the xml file
        DataSet Products = new DataSet();
        Products.ReadXml(HttpContext.Current.Server.MapPath("~/App_Data/ProductsList.xml"));
        return Products.Tables[0].Rows.Count;
    }
}