給text 添加文本，用AppendText()

using System;

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

namespace WinForm6
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            textBox1.AppendText(DateTime.Now.ToString()+'/n');//
            //附加文本用  AppendText()  效果最好！

        }
    }
}