Find in Paged GridView

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace FindRowInPagedGrid
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }


        /// <summary>
        /// Finds the item number, whatever page it's on.
        /// </summary>
        /// <param name="itemnumber">the global item number to find</param>
        protected void SelectRow(int itemnumber)
        {
            int pagesize = GridView1.PageSize;
            int targetpage = (int)Math.Floor((decimal)itemnumber / (decimal)pagesize);
            int targetitem = itemnumber % pagesize;
            GridView1.PageIndex = targetpage;
            GridView1.SelectedIndex = targetitem;
        }

        protected void SelectRow(string searchData)
        {
            int i = 0;
            int theRow=0;

            //how to iterate over the whole grid
            GridView1.AllowPaging = false;
            GridView1.DataBind();

            for (i = 0; i < GridView1.Rows.Count; i++)
            {
                //cell 2 is the data column, don't forget the command column.
                TableCell thisCell = GridView1.Rows[i].Cells[2];

                if (thisCell.Text == searchData)
                    theRow = i;
            }

            //rebind after finding the page
            GridView1.AllowPaging = true;
            GridView1.DataBind();

            SelectRow(theRow);
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            SelectRow("California");
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            SelectRow("Wyoming");
        }
    }
}