首先 下载 org.in2bits.MyXls.dll

https://download.csdn.net/download/qq_30725967/87858610

项目中添加引用：

using org.in2bits.MyXls;

实例代码：

using System;
using System.Data;
using System.Windows.Forms;

using org.in2bits.MyXls;

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

        private void button1_Click(object sender, EventArgs e)
        {
            DataTable dt = new DataTable();
            DataColumn col1 = new DataColumn("col1");
            DataColumn col2 = new DataColumn("col2");
            DataColumn col3 = new DataColumn("col3");
            DataColumn col4 = new DataColumn(