如何在面板中创建动态内容的经典代码

//占位符控件    protected System.Web.UI.WebControls.PlaceHolder phPlaces;
private void InitPlaces()
        {
            LiteralControl lbl;
            string msg;
            LinkButton btn;

            phPlaces.Controls.Clear();
            msg = "Type: {0}, Place: {1}. From {2}/{3} to {4}/{5}. Description: {6}.";

            foreach (DataRow row in ds.Tables["Existing"].Rows)
            {
                lbl = new LiteralControl();
                
                // Format the msg variable with values in the row
                lbl.Text = string.Format(msg, row["Type"], row["Place"], 
                    row["MonthIn"], row["YearIn"], 
                    row["MonthOut"], row["YearOut"], row["Name"]);
                
                btn = new LinkButton();

                // Assign a unique ID to the control
                btn.ID = row["LapseID"].ToString().Replace("-", string.Empty);
                btn.Text = "Delete";
                
                // Pass the LapseID when the link is clicked
                btn.CommandArgument = row["LapseID"].ToString();

                // Attach the handler to the event
                btn.Command += new CommandEventHandler(OnDeletePlace);

                // Add the controls to the placeholder
                phPlaces.Controls.Add(lbl);
                phPlaces.Controls.Add(btn);
                phPlaces.Controls.Add(new LiteralControl("<br>"));
            }
            // Hide the panel if there are no rows
            if (ds.Tables["Existing"].Rows.Count > 0)
                pnlExisting.Visible = true;
            else 
                pnlExisting.Visible = false;
        }