GridView with a single ModalPopupExtender/Panel for row editing

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;
using System.Data.SqlClient;
using System.Xml;

public partial class InternetAddress : BasePage {
	protected override void OnInit(EventArgs e) {
		Master.DataSourceTypeChanged += new EventHandler(Master_DataSourceTypeChanged);
		base.OnInit(e);
	}

	void Master_DataSourceTypeChanged(object sender, EventArgs e) {
		grdInternetAddress.DataSourceID = Master.GetDataSourceIdName("dsInternetAddress"); 
		grdInternetAddress.DataBind();
	}

	#region InternetAddresss
	protected void btnEditInternetAddress_Click(object sender, EventArgs e) {
		ImageButton btnEdit = sender as ImageButton;
		GridViewRow row = (GridViewRow)btnEdit.NamingContainer;

		hidInternetAddressEditIndex.Value = Scrub(row.Cells[1].Text);
		txtInternetAddress.Text = Scrub(row.Cells[2].Text);
		updInternetAddress.Update();
		mpeInternetAddress.Show();

	}
	protected void btnDeleteInternetAddress_Click(object sender, EventArgs e) {

	}
	protected void btnSaveInternetAddress_Click(object sender, EventArgs e) {
		if (grdInternetAddress.DataSourceID == dsInternetAddress.ID) {
			SaveInternetAddress(dsInternetAddress, Convert.ToInt32(hidInternetAddressEditIndex.Value), txtInternetAddress.Text);
		} else {
			SaveInternetAddress(dsInternetAddressXml, Convert.ToInt32(hidInternetAddressEditIndex.Value), txtInternetAddress.Text);
		}
		grdInternetAddress.DataBind();
		updInternetAddress.Update();
		mpeInternetAddress.Hide();
	}
	#endregion

}