How to use Dictionary in c#.net

How to Use Dictionary in C#.NET
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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.Collections;  // firstly add namespace to use array list
namespace Use_Array_List
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnarraylist_Click(object sender, EventArgs e)
        {
            //array list store any type of value like as : integer , char, string, float etc;
            ArrayList arrlist = new ArrayList();

            arrlist.Add("1");
            arrlist.Add("2");
            arrlist.Add(3);

            foreach(string val in arrlist)
            {
                listBox1.Items.Add(val);
            }

        }

        private void btnUseDict_Click(object sender, EventArgs e)
        {
            Dictionary<string, int> dic = new Dictionary<string, int>();

            dic.Add("One", 1); // we can use name place of one two three , like sumit , sum 
            dic.Add("two", 2);
            dic.Add("three", 3);
            dic.Add("four", 4);

            foreach (var val in dic)
            {
                listBox1.Items.Add("Key is :"+val.Key+",Value of Key is :"+val.Value);
            }

        }
    }
}


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