help as separate color numbers, text?

private void listBox2_SelectedIndexChanged(object sender, EventArgs e)

{

str1 = str;

str1 += listBox2.Text;

wassaw.Text = str1;

TextBox1.ForeColor = Color.Red;

switch (str1)

{

case "??????1" :

TextBox1.Text = "" + Environment.NewLine + "1. ?????? " + Environment.NewLine + "2. ?????? " + Environment.NewLine + "3. ?????? ";

break;

case "??????2" :

TextBox1.Text = "" + Environment.NewLine + "1. ?????? ";

break;

case "???????3" :

TextBox1.Text = "" + Environment.NewLine + "1 ?????? ";

break;