using System;
using System.Collections;
using System.Windows.Forms;
using System.Collections.Specialized;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            NameValueCollection markStatus = new NameValueCollection();
            string[] values = null;

            markStatus.Add("Very High", "80");
            markStatus.Add("High", "60");
            markStatus.Add("medium", "50");
            markStatus.Add("Pass", "40");

            foreach (string key in markStatus.Keys)
            {
                values = markStatus.GetValues(key);
                foreach (string value in values)
                {
                    MessageBox.Show (key + " - " + value);
                }
            } 
        }
    }
}