private void DatatableToExcel(DataTable dgv, string Title)
        {
         
            SaveFileDialog dlg = new SaveFileDialog();
            dlg.Filter = "Execl files (*.xls)|*.xls";
            dlg.CheckFileExists = false;
            dlg.CheckPathExists = false;
            dlg.FilterIndex = 0;
            dlg.RestoreDirectory = true;
            dlg.CreatePrompt = true;
            dlg.FileName = Title;
            dlg.Title = "保存为Excel文件";


            if (dlg.ShowDialog() == DialogResult.OK)
            {
                //获得文件路径    
                string localFilePath = dlg.FileName.ToString();
                AsposeExcel ae= newAsposeExcel(localFilePath); 
　　　　　　　　　 ae.DatatableToExcel(dgv,Title); 、
　　　　　　　}

1.添加引用：

Aspose.Cells.dll（我们就叫工具包吧，可以从网上下载。关于它的操作我在“Aspose.Cells操作说明 中文版 下载 Aspose C# 导出Excel 实例”一文中的说。这里你暂时也可不理会它。）
即使没有安装office也能用噢，这是一个好强的大工具。
2.编写Excel操作类

using System;
using System.Collections.Generic;
using System.Text;
using Aspose.Cells;
using System.Data;
public class AsposeExcel
{
    private string outFileName = "";
    private string fullFilename = "";
    private Workbook book = null;
    private Worksheet sheet = null;
    public AsposeExcel(string outfilename, string tempfilename) //导出构造数
    {
        outFileName = outfilename;
        book = new Workbook();
        // book.Open(tempfilename);这里我们暂时不用模板
        sheet = book.Worksheets[0];
    }
    public AsposeExcel(string fullfilename) //导入构造数
    {
        fullFilename = fullfilename;
        // book = new Workbook();
        // book.Open(tempfilename);
        // sheet = book.Worksheets[0];
    }
    private void AddTitle(string title, int columnCount)
    {
        sheet.Cells.Merge(0, 0, 1, columnCount);
        sheet.Cells.Merge(1, 0, 1, columnCount);
        Cell cell1 = sheet.Cells[0, 0];
        cell1.PutValue(title);
        cell1.Style.HorizontalAlignment = TextAlignmentType.Center;
        cell1.Style.Font.Name = "黑体";
        cell1.Style.Font.Size = 14;
        cell1.Style.Font.IsBold = true;
        Cell cell2 = sheet.Cells[1, 0];
        cell1.PutValue("查询时间：" + DateTime.Now.ToLocalTime());
        cell2.SetStyle(cell1.Style);
    }
    private void AddHeader(DataTable dt)
    {
        Cell cell = null;
        for (int col = 0; col < dt.Columns.Count; col++)
        {
            cell = sheet.Cells[0, col];
            cell.PutValue(dt.Columns[col].ColumnName);
            cell.Style.Font.IsBold = true;
        }
    }
    private void AddBody(DataTable dt)
    {
        for (int r = 0; r < dt.Rows.Count; r++)
        {
            for (int c = 0; c < dt.Columns.Count; c++)
            {
                sheet.Cells[r + 1, c].PutValue(dt.Rows[R]­[c].ToString());
            }
        }
    }
    //导出------------下一篇会用到这个方法
    public Boolean DatatableToExcel(DataTable dt)
    {
        Boolean yn = false;
        try
        {
            //sheet.Name = sheetName;
            //AddTitle(title, dt.Columns.Count);
            //AddHeader(dt);
            AddBody(dt);
            sheet.AutoFitColumns();
            //sheet.AutoFitRows();
            book.Save(outFileName);
            yn = true;
            return yn;
        }
        catch (Exception e)
        {
            return yn;
            // throw e;
        }
    }
    public DataTable ExcelToDatatalbe()//导入
    {
        Workbook book = new Workbook();
        book.Open(fullFilename);
        Worksheet sheet = book.Worksheets[0];
        Cells cells = sheet.Cells;
        //获取excel中的数据保存到一个datatable中
        DataTable dt_Import = cells.ExportDataTableAsString(0, 0, cells.MaxDataRow + 1, cells.MaxDataColumn + 1, false);
        // dt_Import.
        return dt_Import;
    }
}[/R]

3. Word导出
//设置文件类型
// saveFileDialog为一个对话框控件
//如果没有人工具栏中拉，
//可以：SaveFileDialog saveFileDialog1=new SaveFileDialog();
saveFileDialog1.Filter = "导出Excel (*.xls)|*.xls|Word (*.doc)|*.doc";
saveFileDialog1.FilterIndex = 1;
saveFileDialog1.RestoreDirectory = true;
saveFileDialog1.CreatePrompt = true;
saveFileDialog1.Title = "导出文件保存路径";
//saveFileDialog1.ShowDialog();
//string strName = saveFileDialog1.FileName;
//设置默认文件类型显示顺序
//saveFileDialog1.FilterIndex = 2;
//保存对话框是否记忆上次打开的目录
saveFileDialog1.RestoreDirectory = true;
//点了保存按钮进入
if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
    //获得文件路径
    string localFilePath = saveFileDialog1.FileName.ToString();
    //获取文件名，不带路径
    string fileNameExt = localFilePath.Substring(localFilePath.LastIndexOf("\\") + 1);
    //获取文件路径，不带文件名
    string FilePath = localFilePath.Substring(0, localFilePath.LastIndexOf("\\"));
    //给文件名前加上时间
    string newFileName = DateTime.Now.ToString("yyyyMMdd") + fileNameExt;
    //在文件名里加字符
    //saveFileDialog1.FileName.Insert(1,"dameng");
    saveFileDialog1.FileName = FilePath + "\\" + newFileName;
    System.IO.FileStream fs = (System.IO.FileStream)saveFileDialog1.OpenFile();//输出文件
    StreamWriter writer = new StreamWriter(fs);
    writer.Write("tttt");//这里就是你要导出到word的内容，内容是你什么你自已DIY
    writer.Flush();
    writer.Close();
    fs.Close();
}

4. 导出datatable到excel

DataTable dt = null;
if (ds_all.Tables[0] != null)
{
    dt = ds_all.Tables[0];
}
else {
    MessageBox.Show("没有数据记录", "*^_^* 温馨提示信息", MessageBoxButtons.OK);
    return;
}
//上面只是取datatable，你自己diy
AsposeExcel tt = new AsposeExcel(saveFileDialog1.FileName, "");//不用模板, saveFileDialog1是什么？上面已经说过
bool OK_NO = tt.DatatableToExcel(dt);
if (OK_NO)
{
    MessageBox.Show("导出成功", "*^_^* 温馨提示信息", MessageBoxButtons.OK);
}
else
{
}

5. Excel导入
private void 导入ToolStripMenuItem_Click(object sender, EventArgs e)
{
    string localFilePath = "";
    //点了保存按钮进入
    if (openFileDialog1.ShowDialog() == DialogResult.OK)// openFileDialog1不要再问我这是什么！
    {
        //获得文件路径
        localFilePath = openFileDialog1.FileName.ToString();
}
    AsposeExcel tt = new AsposeExcel(localFilePath);
    DataTable dt;
    try
    {
        dt = tt.ExcelToDatatalbe();
    }
    catch (Exception ex)
    {
        return;
    }
//有了datatable你自己就可以DIY啦,下面是我自己的你不用理
if (ddlResidence.SelectedValue == "违章确认")
    {
        if (dt.Rows[0][9].ToString() != "违章确认")
        {
                            return;
        }
        row = dt.Rows.Count;
        if (row <= 0) return;
        for (int i = 0; i < dt.Rows.Count; i++)
        {
            bllviola.Up_Confirmed_ByVnum(dt.Rows[i][6].ToString(), dt.Rows[i][9].ToString());
        }
        this.GridView1.DataSource = dt;
        GridView1.DataBind();
}