在.net中如何把数据导入到Excel

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Configuration;

namespace DgToExcel
{
 /// <summary>
 /// WebForm1 的摘要说明。
 /// </summary>
 public class WebForm1 : System.Web.UI.Page
 {
  protected System.Web.UI.WebControls.Button Button1;
  protected System.Web.UI.WebControls.DataGrid DataGrid1;
private readonly string P_Con=ConfigurationSettings.AppSettings["P_Con"].ToString();
  //页面初始化
  
  private void Page_Load(object sender, System.EventArgs e)
  {
   // 在此处放置用户代码以初始化页面
   DataGrid1.DataSource=CreateData();
   DataGrid1.DataBind();
  }
  /// <summary>
  /// 创建数据源
  /// </summary>
  /// <returns>DataView</returns>
  ///
  
  ICollection CreateDataSource()
  {

   DataTable dt = new DataTable();
   DataRow dr;
   dt.Columns.Add(new DataColumn("身份证号码", typeof(string)));
   dt.Columns.Add(new DataColumn("图书单价",typeof(decimal)));
   dt.Columns.Add(new DataColumn("购买数量",typeof(Int32)));
   dt.Columns.Add(new DataColumn("总价格",typeof(decimal)));

   for (int i = 0; i < 30; i++)
   {
    dr = dt.NewRow();

    dr[0] = "123456789123456789";
    dr[1] = 100 * i /3.0;
    dr[2] = i + 5;
    dr[3] = (decimal)dr[1] * (Int32)dr[2];    
    dt.Rows.Add(dr);
   }
   DataView dv = new DataView(dt);
   return dv;
  }
  private DataSet CreateData()
  {
  SqlConnection myconn=new SqlConnection(P_Con);
   string cmdText="select * from news";
   SqlDataAdapter adpt=new SqlDataAdapter(cmdText,myconn);
   DataSet ds=new DataSet();
   try
   {
    myconn.Open();
    adpt.Fill(ds);
   }
   catch(Exception ex)
   {
   throw new Exception(ex.Message,ex);
   }
   return (ds);
  }
  /// <summary>
  /// 输出到Excel
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void Button1_Click(object sender, System.EventArgs e)
  {
 //  Response.Clear();
 //  Response.Buffer=true;
 //  Response.Charset="GB2312";   
 //  Response.AppendHeader("Content-Disposition","attachment;filename=FileName.xls");
 //  Response.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312");//设置输出流为简体中文
 //  Response.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。 (MIME类型)
 //  this.EnableViewState = false;   
 //  System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN",true);
 //  System.IO.StringWriter oStringWriter = new System.IO.StringWriter(myCItrad);
 //  System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
 //  this.DataGrid1.RenderControl(oHtmlTextWriter);
 //  Response.Write(oStringWriter.ToString());
 //  Response.End();
   Response.Clear();//清空缓存
   Response.Buffer=true;//启用缓存
   Response.Charset="GB2312";
   Response.AppendHeader("Content-Disposition","attachment;filename=Filename.xls");
   Response.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312");//设置输出流为简体中文
   Response.ContentType="application/ms-excel";
   this.EnableViewState=false;
   //下方的内容为导入到excel的主要语句
   System.Globalization.CultureInfo myCItrad=new System.Globalization.CultureInfo("ZH-CN",true);
   System.IO.StringWriter oStringWriter =new System.IO.StringWriter(myCItrad);//文件流
   System.Web.UI.HtmlTextWriter oHtmlTextWriter=new System.Web.UI.HtmlTextWriter(oStringWriter);
   this.DataGrid1.RenderControl(oHtmlTextWriter);//读取Datagrid中的数据
   Response.Write(oStringWriter.ToString());//输出到stringwriter
   Response.End();
  }

  #region Web 窗体设计器生成的代码
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
   //
   InitializeComponent();
   base.OnInit(e);
  }

  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {   
   this.Button1.Click += new System.EventHandler(this.Button1_Click);
      this.Load += new System.EventHandler(this.Page_Load);

  }
  #endregion

  private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
  {
   if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
   {
    e.Item.Cells[0].Attributes.Add("style","vnd.ms-excel.numberformat:@");
    e.Item.Cells[3].Attributes.Add("style","vnd.ms-excel.numberformat:￥#,###.00");
   }
  }

  
 }
}
 

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