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;using System.IO;namespace WindowsFormsApplication5{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            if (textBox1.Text == string.Empty)            {                MessageBox.Show("文件夹名称不能为空");            }            else            {                if (Directory.Exists(textBox1.Text))//使用Directory类的Exists方法判断要创建的文件夹                {                    MessageBox.Show("该文件夹已经存在");                }                else                {                    Directory.CreateDirectory(textBox1.Text);//使用Directory类的CreateDirectory方法创建文件                }            }        }    }}