c#+winform+combobox+动态生成控件,根据选择的内容

根据combobox选择的内容生成控件，窗体添加一个combobox和一个panel，在panel中添加控件，方便添加其他控件之前可以清除以前的控件

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace WindowsApplication21
{
    



    public partial class Form1 : Form
    {


        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            

            this.comboBox1.Items.Add("tcp");
            this.comboBox1.Items.Add("udp");
           
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            this.panel1.Controls.Clear();
            Label lbl = new Label();
            this.panel1.Controls.Add(lbl);
          
            lbl.Text = comboBox1.SelectedItem.ToString();
            lbl.Name = "lbl" + lbl.Text;
            lbl.Top = this.panel1.Top;
            lbl.Width = 50;
            lbl.Height = 20;
           
            TextBox tb = new TextBox();
            this.panel1.Controls.Add(tb);
            tb.Text = "";
            tb.Name = "tb" + lbl.Text;
            tb.Top = lbl.Top;
            tb.Left = lbl.Right + 10;
            tb.Width = 200;
            tb.Height = 20;

        }
    }
    public class ListItem
    {

        private string textField;

        public string TextField
        {
            get { return textField; }
            set { textField = value; }
        }

        private string valueField;

        public string ValueField
        {

            get { return valueField; }
            set { valueField = value; }
        }
    }

    //下面绑定
}