Datagridview da bir kolonda tekrarlayanları bulup yeni datagridview da tekrarlama sayilarini gösterme

    
    
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 WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            for (int i = 0; i < 12; i++)
            {
                dataGridView1.Rows.Add();
            }

            for (int i = 0; i < 3; i++)
            {
                dataGridView1[0, i].Value = "Ahmet";
            }

            for (int i = 3; i < 7; i++)
            {
                dataGridView1[0, i].Value = "Mehmet";
            }

            for (int i = 7; i < 12; i++)
            {
                dataGridView1[0, i].Value = "mustafa";
            }

        }
        Dictionary < string, int > tekrarlayanSayisi = new Dictionary < string, int > ();
        
        private void buttonSınıflandır_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < dataGridView1.Rows.Count; i++)
            {
                if (tekrarlayanSayisi.ContainsKey(dataGridView1[0, i].Value.ToString()))
                {
                    tekrarlayanSayisi[dataGridView1[0, i].Value.ToString()] = 
                    int.Parse(tekrarlayanSayisi[dataGridView1[0, i].Value.ToString()].ToString()) + 1;
                }
                else
                {
                    tekrarlayanSayisi.Add(dataGridView1[0,i].Value.ToString(), 1);
                }
            }

            int satir = 0;
            dataGridView2.Rows.Clear();
            foreach (KeyValuePair < string, int > item in tekrarlayanSayisi )
            {
                dataGridView2.Rows.Add();
                dataGridView2[0, satir].Value = item.Key;
                dataGridView2[1, satir].Value = item.Value;
                satir++;
            }
        }
    }
}