FileStream fs = new FileStream(txtYoluBurayaGelecek, FileMode.Open, FileAccess.Read);
StreamReader sw = new StreamReader(fs, Encoding.GetEncoding("windows-1254"));
string yazi = sw.ReadLine();
while (yazi != null)
{
TextBox1.Text+=yazi ;
yazi = sw.ReadLine();
}
sw.Close();
fs.Close();