C#

<br />
public delegate void DellagacjaVoid();<br />
<br />
        public void pingowanie()<br />
        {<br />
            if (this.InvokeRequired)<br />
            {<br />
                DellagacjaVoid delegacja = new DellagacjaVoid(pingowanie);<br />
                this.Invoke(delegacja);<br />
            }<br />
<br />
            string sciezka = "plik.txt";<br />
            if (File.Exists(sciezka))<br />
            {                               <br />
                FileStream fs = new FileStream(sciezka, FileMode.Open, FileAccess.Read);<br />
                StreamReader reader = new StreamReader(fs);<br />
                string linia = reader.ReadLine();<br />
                linia = null;<br />
                while ((linia=reader.ReadLine()) != null)<br />
                {<br />
                    try<br />
                    {                        <br />
                        richTextBox1.Text += linia + "\n";<br />
                    }<br />
                    catch (Exception ex)<br />
                    {<br />
                        MessageBox.Show(ex.Message);<br />
                    }<br />
                }<br />
                reader.Close();<br />
            }<br />
        }<br />
<br />
private void button1_Click(object sender, EventArgs e)<br />
        {<br />
            Thread watek = new Thread(pingowanie);<br />
            watek.Start();            <br />
        }<br />