Simple code for dynamically adding user controls using + button functionality in ASP.NET

static int i = 0;
        static List<int> count = new List<int>();
       
        protected void Page_Load(object sender, EventArgs e)
        {
          
        }
        protected override void CreateChildControls()
        {
            base.CreateChildControls();
            RebuildFields();
        }
        void RebuildFields()
        {
            foreach (int j in count)
            {
                UserControl uc = (UserControl)Page.LoadControl("Field.ascx");
                uc.ID = "uc" + j;
                pnlField.Controls.Add(uc);
                LiteralControl lc = new LiteralControl();
                lc.ID = "lc" + j;
                lc.Text = "<br/>";
                pnlField.Controls.Add(lc);
                Button btnAddField = new Button();
                btnAddField.ID = "btnAddField" + j;
                btnAddField.Text = "+";
                btnAddField.Click += btnAddField_Click;
                pnlField.Controls.Add(btnAddField);
                              

                lc = new LiteralControl();
                lc.ID = "lc_" + j;
                lc.Text = "<br/>";
                pnlField.Controls.Add(lc);
            }
        }
        protected void btnAddField_Click(object sender, EventArgs e)
        {
            UserControl uc = (UserControl)Page.LoadControl("Field.ascx");
            i = i + 1;
            count.Add(i);
            uc.ID = "uc" + i;
            pnlField.Controls.Add(uc);
            LiteralControl lc = new LiteralControl();
            lc.ID = "lc" + i;
            lc.Text = "<br/>";
            pnlField.Controls.Add(lc);
            Button btnAddField = new Button();
            btnAddField.ID = "btnAddField" + i;
            btnAddField.Text = "+";
            btnAddField.Click += btnAddField_Click;
            pnlField.Controls.Add(btnAddField);
                       
            lc = new LiteralControl();
            lc.ID = "lc_" + i;
            lc.Text = "<br/>";
            pnlField.Controls.Add(lc);
        }
    }