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private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                StreamReader sr = new StreamReader(File.OpenRead(ofd.FileName));
                string inhalt = sr.ReadToEnd();
                string[] leseDatei = File.ReadAllLines(inhalt);
                string sPattern = "Hallo";


               [i] /*  string[] sentences =
                  {
                  "Das ist Hallo",
                  "Das war hell",
                  "Das ist Dunkel",
                  "Das ist Hallo"
                  };
                   string sPattern = "Hallo"; */[/i]




                foreach (string s in leseDatei)
                {
                    System.Console.Write("{0,24}", s);

                    if (System.Text.RegularExpressions.Regex.IsMatch(s, sPattern, System.Text.RegularExpressions.RegexOptions.IgnoreCase))
                    {
                        System.Console.WriteLine(" (match for '{0}' found)", sPattern);
                    }
                    else
                    {
                        System.Console.WriteLine();
                    }
                }