How can I import data from file to particular text boxes using C#

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C#

i am implementing an utility,in that i have to read data from a file ,and then i have to pass the particular data to particular text boxes , in this am using open dialogue box,
am able to read the complete data but for selecting particular data and importing to text boxes i am not able do ,so any one plz help me to resolve this problem.

What I have tried:

public partial class Form1 : Form
    {
        private string productName = string.Empty;
        private string FrmvareVs = string.Empty;
        private string RlsDate = string.Empty;
        private string HexFile = string.Empty;
        private string cmssnWizard = string.Empty;
        private string InstalationVer = string.Empty;
        private string LbdDependent = string.Empty;
        private string HelpDependent = string.Empty;

        string strProductPath = string.Empty;
        private string filePath = string.Empty;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog1 = new OpenFileDialog();
            openFileDialog1.Filter = "Iss Files (.iss)|*.iss|All Files (*.*)|*.*";
            openFileDialog1.FilterIndex = 1;
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                textBox1.Text = openFileDialog1.FileName;
                // Open the selected file to read.
                System.IO.Stream fileStream = openFileDialog1.OpenFile();
                string readContents;
                using (System.IO.StreamReader reader = new System.IO.StreamReader(fileStream))
                {

                  
                    readContents = reader.ReadToEnd();
                    //textBox4.Text = readContents;


                    fileStream.Close();
                }