form1.cs

Visual C#2005程序设计教程

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

namespace WindowsApplication5_7
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int sum, k;
            sum = 1;
            for (k = 1; k <= 10; k++)
            {
                sum = sum * k;
            }
            textBox1.Text = sum.ToString();
        }
    }
}