How display color to numbers of days in a month

Question

string date = TextBox2.Text;

DateTime dt1 = DateTime.ParseExact(date, "dd/MM/yyyy", CultureInfo.InvariantCulture);

TextBox3.Text = dt1.AddDays(30).ToString("dd/MM/yyyy");

if (dt1.Day == 29)

Label1.BackColor = Color.Red;

Label1.Text = "Bad Status of Team Working Now";

if (dt1.Day == 30)

Label1.BackColor = Color.Green;

Label1.Text = "Good Status of Team Working Now";

if (dt1.Day == 27)

Label1.BackColor = Color.Yellow;

Label1.ForeColor = Color.Red;

Label1.Text = "Start to change Status of Team Working Now";

 

above code working good