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.