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

namespace First
{
    public partial class Form1 : Form
    {
        public Form1()
        private void Main(object sender, EventArgs e)
        {
            string theString;
            theString = "欢迎来到C#世界！";
            this.textBox1.Text = theString;
        }
    }
}

谢谢上面朋友....我想问题就是出在这里了....这两天电脑拿去修了！所以没有来论坛..没有及时回复你们...抱歉！现在修复代码去...