Reading text files and creating string for necessary infos.

Question

Hello,

I am beginner in C# and I need your help.
 I can read the file and I can see it in my richtextbox.  But I do not want to see all of lines in richtextbox. I want to see lines which are begin with MR, MISS and CHD. I can not do that. Than, I will save them to the my database. My text file is like that:


  1    MR HANN CO       03.04.10 10.04.10  7  1XDouble Room Balcony ( All Inclusive    278115
  2    CHD. INGA CO  13J.
  3    MISS JON, BIRGITTA      03.04.10 10.04.10  7  1XDeluxe Suite, Balcony All Inclusive    278115                GOT FHY836
  4    MR JONSSON, PER
  5    CHD JONSSON, OSKAR     12J.
  6    CHD JONSSON, JAKOB      9J.
  7    CHD JONSSON, ISAK       5J.
  8    MISS NAIMER, HENNA       03.04.10 10.04.10  7  1XFamily Suite Balcony  All Inclusive    411622                HEL XQ 6525



 My codes are:

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

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog fdlg = new OpenFileDialog();
            fdlg.Title = "Open File";
            fdlg.InitialDirectory = @"c:\";
            fdlg.Filter = "Text files(*.txt)|*.txt";
            fdlg.FilterIndex = 2;
            fdlg.RestoreDirectory = true;
            fdlg.RestoreDirectory = true;
            if (fdlg.ShowDialog() == DialogResult.OK)
            {
                textBox1.Text = fdlg.FileName;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == string.Empty)
            {
                MessageBox.Show("Please browse text file!");
            }
            FileStream akis;
            StreamReader Okuma;
            string Yol = textBox1.Text;
            akis = new FileStream(Yol, FileMode.Open, FileAccess.Read);
            Okuma = new StreamReader(akis);

           

            richTextBox1.Text = Okuma.ReadToEnd(); // I can just do this. but here, I want to see necessary informations.



            MessageBox.Show("Operation is completed.");