using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data .SqlClient ;
using System.Data ;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
String sqlconn = "Server=.; DataBase=db; Integrated Security=SSPI ";
string sql = "select top 10 * from table";

SqlConnection myConnection = new SqlConnection(sqlconn);// 創建數據庫連接實例

myConnection.Open(); //打開數據庫

SqlCommand myCommand = new SqlCommand(sql, myConnection);//創建sql的實例，執行一個sql


SqlDataAdapter Adapter = new SqlDataAdapter();//創建一個sql數據適配器
Adapter.SelectCommand = myCommand;//屬性設置為 從數據源中檢索記錄


DataSet myDs = new DataSet(); //創建數據集實例
Adapter.Fill(myDs);//填充數據集

GridView1.DataSource = myDs.Tables[0].DefaultView;//
GridView1.DataBind();

// DataToExcel("測試的cxcel", GridView1);
myConnection.Close();//關閉數據庫連接
}
public void DataToExcel(string fileName, GridView myGridView)
{
//定義文檔類型、字符編碼
Response.Clear();
Response.Buffer = false;
//Response.Charset = "utf-8";
Response.Charset = "GB2312";
//下面這行很重要， attachment 參數表示作為附件下載，您可以改成 online在線打開
//filename=FileFlow.xls 指定輸出文件的名稱，注意其擴展名和指定文件類型相符，可以為：.doc || .xls || .txt ||.htm
Response.AppendHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8) + ".xls");
Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
//Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
//Response.ContentType指定文件類型 可以為application/ms-excel || application/ms-word || application/ms-txt || application/ms-html || 或其他瀏覽器可直接支持文檔
Response.ContentType = "application/ms-excel";
this.EnableViewState = false;
//System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN", true);
//定義一個輸入流
System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
//將目標數據綁定到輸入流輸出
myGridView.RenderControl(oHtmlTextWriter);
Response.Write(oStringWriter.ToString());
Response.End();
}

//下面這個空語句一定要加，否則會出現“必須放在具有 runat=server 的窗體標記內。”的錯誤
public override void VerifyRenderingInServerForm(Control control)
{
}

//點擊事件，生成excel
protected void Button1_Click(object sender, EventArgs e)
{
DataToExcel("測試的cxcel", GridView1);
}
}