TableDataSource - Binding DataTable to Rich Data Controls

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 TestTableDataSource : System.Web.UI.Page
{
	protected void Page_Load(object sender, EventArgs e)
	{
		lblError.Text = "";

		if (!IsPostBack)
		{
			DataTable tabulka = new DataTable("MyTable");

			tabulka.Columns.Add("Id", typeof(int));
			tabulka.Columns.Add("Title", typeof(string));
			tabulka.Columns.Add("FirstName", typeof(string));
			tabulka.Columns.Add("LastName", typeof(string));
			tabulka.Columns.Add("Born", typeof(DateTime));
			tabulka.Columns.Add("Gender", typeof(Sample.Gender));
			tabulka.Columns.Add("Valid", typeof(bool));

			DataRow row = tabulka.NewRow();
			row["Id"] = 1;
			row["Title"] = "RNDr.";
			row["FirstName"] = "Jiri";
			row["LastName"] = "Soler";
			row["Born"] = DateTime.Parse("20.4.1947");
			row["Gender"] = Sample.Gender.Men;
			row["Valid"] = true;
			tabulka.Rows.Add(row);

			row = tabulka.NewRow();
			row["Id"] = 2;
			row["Title"] = "";
			row["FirstName"] = "Pavel";
			row["LastName"] = "Vodrazka";
			row["Born"] = DateTime.Parse("11.2.1989");
			row["Gender"] = Sample.Gender.Men;
			row["Valid"] = true;
			tabulka.Rows.Add(row);

			row = tabulka.NewRow();
			row["Id"] = 3;
			row["Title"] = "";
			row["FirstName"] = "Petr";
			row["LastName"] = "Jaros";
			row["Born"] = DateTime.Parse("3.6.1990");
			row["Gender"] = Sample.Gender.Men;
			row["Valid"] = true;
			tabulka.Rows.Add(row);

			row = tabulka.NewRow();
			row["Id"] = 4;
			row["Title"] = "";
			row["FirstName"] = "Jan";
			row["LastName"] = "Kulhavy";
			row["Born"] = DateTime.Parse("10.12.1989");
			row["Gender"] = Sample.Gender.Men;
			row["Valid"] = true;
			tabulka.Rows.Add(row);

			row = tabulka.NewRow();
			row["Id"] = 5;
			row["Title"] = "";
			row["FirstName"] = "Jana";
			row["LastName"] = "Kulhava";
			row["Born"] = DateTime.Parse("3.1.2000");
			row["Gender"] = Sample.Gender.Women;
			row["Valid"] = true;
			tabulka.Rows.Add(row);

			row = tabulka.NewRow();
			row["Id"] = 6;
			row["Title"] = "ing.";
			row["FirstName"] = "Tomas";
			row["LastName"] = "Kucera";
			row["Born"] = DateTime.Parse("3.8.1899");
			row["Gender"] = Sample.Gender.Men;
			row["Valid"] = true;
			tabulka.Rows.Add(row);

			row = tabulka.NewRow();
			row["Id"] = 7;
			row["Title"] = "MUDr.";
			row["FirstName"] = "Vaclav";
			row["LastName"] = "Moudry";
			row["Born"] = DateTime.Parse("13.2.2006");
			row["Gender"] = Sample.Gender.Men;
			row["Valid"] = true;
			tabulka.Rows.Add(row);

			row = tabulka.NewRow();
			row["Id"] = 8;
			row["Title"] = "maj.";
			row["FirstName"] = "Tereza";
			row["LastName"] = "Statecna";
			row["Born"] = DateTime.Parse("13.2.2006");
			row["Gender"] = Sample.Gender.Women;
			row["Valid"] = true;
			tabulka.Rows.Add(row);

			tabulka.PrimaryKey = new DataColumn[] {tabulka.Columns["Id"]};

			tabulka.AcceptChanges();
			tableDataSource.Table = tabulka;

			ViewState["tabulka"] = tabulka;
		} else {
			tableDataSource.Table = (DataTable)ViewState["tabulka"];
		}

	}
	protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
	{
		if (GridView1.EditIndex >= 0)
		{
			lblError.Text = "Cannot change page while editing";
			e.Cancel = true;
		}
	}
	protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
	{
		if (GridView1.EditIndex >= 0)
		{
			lblError.Text = "Cannot change edit row";
			e.NewEditIndex = GridView1.EditIndex;
		}
	}
	protected void insertButton_Click(object sender, EventArgs e)
	{
		DataTable table = tableDataSource.Table;
		DataRow row = table.NewRow();
		row["Gender"] = 0;
		table.Rows.InsertAt(row, table.Rows.Count);
		if (GridView1.AllowPaging)
		{
			GridView1.PageIndex = table.Rows.Count / GridView1.PageSize;
		}
		GridView1.EditIndex = (table.Rows.Count - 1) % GridView1.PageSize;
	}
	protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
	{
		DataRow row = tableDataSource.Table.Rows[GridView1.Rows[e.RowIndex].DataItemIndex];
		if (row.RowState == DataRowState.Added)
		{
			row.Delete();
		}
	}
}