how to read html table in C#.net

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web;
using System.IO;
using System.Net;
using System.Text.RegularExpressions;
using System.Xml.Linq;
namespace TGetWeb
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
GetHtmlPage("http://localhost/t/z3.htm");

}
private string GetHtmlPage(string strURL)
{

String strResult;
WebResponse objResponse;
WebRequest objRequest = HttpWebRequest.Create(strURL);
objResponse = objRequest.GetResponse();
using (StreamReader sr = new StreamReader(objResponse.GetResponseStream()))
{
strResult = sr.ReadToEnd();

sr.Close();
}
// strResult = strResult.Remove(0, strResult.LastIndexOf(""));
string[] values = strResult.Split(new string[] { "" }, StringSplitOptions.RemoveEmptyEntries);

// Response.Write("" + values[1] + "");
ConvertHTMLTablesToDataSet("" + values[1] + "");
// List<string> list = new List<string>(values);

return strResult;
}

private DataSet ConvertHTMLTablesToDataSet(string HTML)
{
// Declarations
DataSet ds = new DataSet();
DataTable dt = null;
DataRow dr = null;
//DataColumn dc = null;
string TableExpression = "<table[^>]*>(.*?)";
string HeaderExpression = "<th[^>]*>(.*?)";
string RowExpression = "<tr[^>]*>(.*?)";
string ColumnExpression = "<td[^>]*>(.*?)";
bool HeadersExist = false;
int iCurrentColumn = 0;
int iCurrentRow = 0;

// Get a match for all the tables in the HTML
MatchCollection Tables = Regex.Matches(HTML, TableExpression, RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.IgnoreCase);
// Loop through each table element
foreach (Match Table in Tables)
{
// Reset the current row counter and the header flag
iCurrentRow = 0;
HeadersExist = false;

// Add a new table to the DataSet
dt = new DataTable();

//Create the relevant amount of columns for this table (use the headers if they exist, otherwise use default names)
if (Table.Value.Contains("<th")> {
// Set the HeadersExist flag
HeadersExist = true;

// Get a match for all the rows in the table
MatchCollection Headers = Regex.Matches(Table.Value, HeaderExpression, RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.IgnoreCase);

// Loop through each header element
foreach (Match Header in Headers)
{
dt.Columns.Add(Header.Groups[1].ToString());
}
}
else
{
for (int iColumns = 1; iColumns <= Regex.Matches(Regex.Matches(Regex.Matches(Table.Value, TableExpression, RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.IgnoreCase)[0].ToString(), RowExpression, RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.IgnoreCase)[0].ToString(), ColumnExpression, RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.IgnoreCase).Count; iColumns++)
{
dt.Columns.Add("Column " + iColumns);
}
}


//Get a match for all the rows in the table

MatchCollection Rows = Regex.Matches(Table.Value, RowExpression, RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.IgnoreCase);

// Loop through each row element
foreach (Match Row in Rows)
{
// Only loop through the row if it isn't a header row
if (!(iCurrentRow == 0 && HeadersExist))
{
// Create a new row and reset the current column counter
dr = dt.NewRow();
iCurrentColumn = 0;

// Get a match for all the columns in the row
MatchCollection Columns = Regex.Matches(Row.Value, ColumnExpression, RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.IgnoreCase);

// Loop through each column element
foreach (Match Column in Columns)
{
// Add the value to the DataRow
dr[iCurrentColumn] = Column.Groups[1].ToString();

// Increase the current column
iCurrentColumn++;
}

// Add the DataRow to the DataTable
dt.Rows.Add(dr);

}

// Increase the current row counter
iCurrentRow++;
}


// Add the DataTable to the DataSet
ds.Tables.Add(dt);

}
GridView1.DataSource = dt;
lbRowCount.Text = dt.Rows.Count.ToString();
return ds;
}
}
}