只需将ContentType 设置为 "application/vnd.ms-excel",表示以Excel方式输出.
代码如下:
DataToExcel.aspx:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DataToExcel.aspx.cs" Inherits="DataToExcel" %>

   


   

public partial class DataToExcel : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            this.Response.ContentType = "application/vnd.ms-excel";
            string ConnStr = "server=localhost;uid=sa;pwd=;database=northwind";
            SqlConnection Conn = new SqlConnection(ConnStr);
            Conn.Open();
            string sqlcmd = "select lastname,firstname,title, address, city from employees";
            SqlCommand cmd = new SqlCommand(sqlcmd, Conn);
            SqlDataAdapter adapter = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            adapter.Fill(ds);
            this.GridView1.DataSource = ds.Tables[0].DefaultView;
            this.GridView1.DataBind();
        }
    }
}