Combobox'ta kelime sayısını hesaplamak



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;

namespace webbrowserArama
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
string aranan=textBox1.Text;
HtmlDocument doc = webBrowser1.Document;
string s = doc.Body.InnerText.ToLower(); ;
int adet = 0;
MessageBox.Show(s);
while (s.IndexOf(aranan) != -1)
{
adet++;
s = s.Substring(s.IndexOf(aranan) + aranan.Length, s.Length - s.IndexOf(aranan) - aranan.Length);
}

MessageBox.Show(adet.ToString());

}

private void Form1_Load(object sender, EventArgs e)
{
webBrowser1.Navigate("www.google.com.tr");
}
}
}