GridView数据导入Excel

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<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" > 
<head id="Head1" runat="server"> 
    <title>GridView数据导入Excel</title>
</head> 
<body> 
    <form id="form1" runat="server"> 
    <div> 
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="10" ForeColor="#333333" PageSize="3" ShowFooter="True" OnRowDataBound="GridView1_RowDataBound">  
            <FooterStyle BackColor="White" ForeColor="#000066" /> 
            <Columns> 
                <asp:BoundField DataField="ID" HeaderText="用户ID" ReadOnly="True" />
                <asp:BoundField DataField="Name" HeaderText="用户姓名" /> 
                <asp:BoundField DataField="Sex" HeaderText="性别" /> 
                <asp:BoundField DataField="Birthday" HeaderText="出生日期" DataFormatString="{0:yyyy年M月dd日}" HtmlEncode="False" />
                <asp:BoundField DataField="Salary" HeaderText="薪水" />
                <asp:BoundField DataField="Address" HeaderText="家庭住址" /> 
                <asp:BoundField DataField="PostCode" HeaderText="邮政编码" />
            </Columns> 
            <RowStyle ForeColor="#000066" /> 
            <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" /> 
            <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" /> 
            <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" /> 
        </asp:GridView>
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="导出" />
    </div>           
    </form> 
</body> 
</html>

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Drawing;
using System.IO;
using System.Text;
public partial class _Default : System.Web.UI.Page
{
    SqlConnection sqlConn;
    SqlCommand sqlComm;
    string strConn = "Data Source=(local);Database=Exercise;Uid=sa;Pwd=sa";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            databind();
        }
    }
    private void databind()
    {
        string strSql = "select * from myDt";
        sqlConn = new SqlConnection(strConn);
        SqlDataAdapter sqlDa = new SqlDataAdapter(strSql, sqlConn);
        DataSet ds = new DataSet();
        sqlConn.Open();
        sqlDa.Fill(ds, "myDt");
        GridView1.DataSource = ds;
        GridView1.DataKeyNames = new string[] { "ID" };
        GridView1.DataBind();
        for (int i = 0; i < GridView1.Rows.Count; i++)
        {
            DataRowView drv = ds.Tables["myDt"].DefaultView[i];
            string strSalary = Convert.ToString(drv["Salary"]);
            if (Convert.ToDouble(strSalary) < 2500)
            {
                GridView1.Rows[i].Cells[4].BackColor = System.Drawing.Color.Red;
            }
        }
        sqlConn.Close();
    }
    double sum = 0;
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowIndex >= 0)
        {
            sum += Convert.ToDouble(e.Row.Cells[4].Text);
        }
        else if(e.Row.RowType==DataControlRowType.Footer)
        {
            e.Row.Cells[3].Text = "总薪水为：";
            e.Row.Cells[4].Text = sum.ToString();
            e.Row.Cells[5].Text = "平均薪水为：";
            e.Row.Cells[6].Text = ((int)(sum / GridView1.Rows.Count)).ToString();
        }
    }
    private void Export(string strFileType, string strFileName)
    {
        Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8).ToString());
        Response.ContentType = strFileType;
        this.EnableViewState = false;
        StringWriter sw = new StringWriter();
        HtmlTextWriter htw = new HtmlTextWriter(sw);
        GridView1.RenderControl(htw);
        Response.Write(sw.ToString());
        Response.End();
    }
    public override void VerifyRenderingInServerForm(Control control)
    {
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Export("application/ms-excel", "学生成绩报表.xls");
    }
}