How to use combobox using c#

This code shows how we can use combobox in our winforms application using c#.

    public partial class frmComboBox_Demo : Form
    {
        public frmComboBox_Demo()
        {
            InitializeComponent();

            comboBox1.Items.Add("Item 4");
            comboBox1.Items.Add("Item 5");
            comboBox1.Items.Add("Item 6");

            comboBox1.SelectedIndex = 2;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Selected text of combobox is: " + comboBox1.SelectedText);
            MessageBox.Show("Text of combobox is: " + comboBox1.Text);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            comboBox1.Focus();
            MessageBox.Show("Selected text of combobox is: " + comboBox1.SelectedText);
            MessageBox.Show("Text of combobox is: " + comboBox1.Text);
        }

    }