RichText LoadFile/SaveFile function for normal text

Question

I know that LoadFile works for RichText, but is there an alternative, if i want to use a simmilar function for normal text?

 

Thank you in advance

private void button Open_Click(object sender, EventArgs e)
{
   if (openFileDialogNotes.ShowDialog()==DialogResult.OK)
      {
         textBoxMain.LoadFile(openFileDialogNotes.FileName);
      }
}

P.S. is there an alternative for the SaveFile funtion too?