On the Way

public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            for (int i = 0; i <= 10; i++)
            {
                Label label = new Label();
                label.Text = i + " ";
                label.Font.Size = FontUnit.Point(16 + i * 4);
                label.ForeColor = Color.DarkBlue;
                if (i % 2 == 0)
                {
                    label.BackColor = Color.DarkGray;
                }
                aaa.Controls.Add(label);
            }
        }

 

Result :