gridview 打开word/excel 生成/另存为word/excel

//前台页面   
EnableEventValidation = "false"  必须有。。。。。。。。。。。。

<%@ Page Language="C#" EnableEventValidation="false" AutoEventWireup="true" CodeFile="daochu.aspx.cs" Inherits="test_daochu" %>


    <asp:Panel ID="Panel1" runat="server" Height="34px" Width="747px">
        把账本表格导入到<asp:DropDownList ID="DropDownList1" runat="server">
            <asp:ListItem Value="excel">Excel</asp:ListItem>
            <asp:ListItem Value="word">word</asp:ListItem>
        </asp:DropDownList>
        <asp:Button ID="Button1" runat="server" Text="在线打开"  CommandName="open" OnCommand="Button_Click"/>
        <asp:Button ID="Button2" runat="server" Text="本地保存"  CommandName="save" OnCommand="Button_Click"/></asp:Panel>
        
    <asp:GridView ID="GridView1" runat="server" AllowPaging="True" AutoGenerateColumns="False"
        CellPadding="4" DataKeyNames="id" ForeColor="#333333" GridLines="None" OnPageIndexChanging="DisplayNews_PageIndexChanging"
        Width="800px" PageSize="50">
        <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
        <Columns>
            <asp:BoundField DataField="id" HeaderText="编号" Visible="False" />
            <asp:BoundField DataField="Title" HeaderText="标题">
                <ItemStyle Width="120px" />
            </asp:BoundField>
            <asp:BoundField DataField="cont" HeaderText="内容">
                <ItemStyle Width="500px" />
            </asp:BoundField>
            <asp:BoundField DataField="AddTime" HeaderText="添加时间">
                <ItemStyle Width="120px" />
            </asp:BoundField>
            
        </Columns>
        <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
        <EditRowStyle BackColor="#999999" />
        <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
        <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
        <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
        <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
    </asp:GridView>

//后台页面

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;


    protected void Page_Load(object sender, EventArgs e)
    {
        if( !IsPostBack )
        {
            GRBind();
        }
    }

    //导出表 到 Excel word 
    protected void Button_Click( object sender, CommandEventArgs e )
    {
        switch( e.CommandName )
        {
            case "save":
                switch( DropDownList1.SelectedValue )
                {
                    case "excel":
                        OutPut( "attachment;filename=out.xls", "application/ms-excel" );
                        break;
                    case "word":
                        OutPut( "attachment;filename=out.doc", "application/ms-word" );
                        break;

                }
                break;
            case "open":
                switch( DropDownList1.SelectedValue )
                {
                    case "excel":
                        OutPut( "online;filename=out.xls", "application/ms-excel" );
                        break;
                    case "word":
                        OutPut( "online;filename=out.doc", "application/ms-word" );
                        break;

                }
                break;
        }
    }
    private void OutPut( string fileType, string strType )
    {
        Response.Clear();
        Response.Buffer = true;
        Response.Charset = "GB2312";
        Response.AppendHeader( "Content-Disposition", fileType );
        Response.ContentType = strType;
        this.EnableViewState = false;
        System.IO.StringWriter swOut = new System.IO.StringWriter();
        HtmlTextWriter hTw = new HtmlTextWriter( swOut );
        GridView1.RenderControl( hTw );
        Response.Write( swOut.ToString() );
        Response.End();
    }
    public override void VerifyRenderingInServerForm( Control control )
    {

    }

    protected void DisplayNews_PageIndexChanging( object sender, GridViewPageEventArgs e )
    {
        GridView1.PageIndex = e.NewPageIndex;
        //GRBind( Session[ "username" ].ToString() );
    }
    //private void GRBind( string userName )
    private void GRBind()
    {
        //DataSet ds = new DataSet();
        //string strWhere = " Note.typeid = Type.typeid  and Note.username =  '" + userName + "' ";
        //ds = bn.GetList( strWhere );
        newsDao.newsDao nd=new newsDao.newsDao();
        this.GridView1.DataSource = nd.get_news();
        this.GridView1.DataBind();

    }