[Dark Dragon]

Даже если я делаю так:

private void button1_Click(object sender, EventArgs e)
         {  int i = 0;
         for (; i < 10; i++)
         {
             string say = "dasas";
             Dialogbox.Text += say + Environment.NewLine;
             int my1stPosition = Dialogbox.Text.Length - say.Length -1;
             Dialogbox.SelectionStart = my1stPosition;
             Dialogbox.SelectionLength = say.Length;
             Dialogbox.SelectionColor = Color.Red;
             Th();
             say = "bla bla bla";
             Dialogbox.Text += say + Environment.NewLine;
             int my2ndPosition = Dialogbox.Text.Length - say.Length - 1;
             Dialogbox.SelectionStart = my2ndPosition;
             Dialogbox.SelectionLength = say.Length;
             Dialogbox.SelectionColor = Color.Green;
             Dialogbox.SelectionAlignment = HorizontalAlignment.Right;
         }

Ничего не меняется.