Enable or disable textbox based on combobox value

hi,

agree with Satyapriya Nayak, it must work if you compare proper value in proper event..

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 WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            textBox1.Text = "";
            if (comboBox1.SelectedItem.ToString() == "Yes")
            {
                textBox1.Enabled = true;
                textBox1.Text = "Good Health";
            }
            else
            {
                textBox1.Enabled = false;
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
           
            textBox1.Enabled = false;
            comboBox1.Items.Add("Yes");
            comboBox1.Items.Add("No");
        }
    }
}