将GridView中数据导出到Excel中

protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            BindData();
        }
    }
    
    private void BindData()
    {
        string query = "SELECT * FROM orders";
        SqlConnection conn = new SqlConnection("server=.;database=northwind;uid=sa;pwd=sa");
        SqlDataAdapter ad = new SqlDataAdapter(query, conn);
        DataSet ds = new DataSet();
        ad.Fill(ds);
        GridView1.DataSource = ds.Tables[0];
        GridView1.DataBind();

    }


    public override void VerifyRenderingInServerForm(Control control)
    {

        
    }

    protected void Button2_Click(object sender, EventArgs e)
    {
        Response.Clear();

        Response.AddHeader("content-disposition","attachment;filename=FileName.xls");

        Response.Charset = "gb2312";
        Response.ContentType = "application/vnd.xls";

        System.IO.StringWriter stringWrite = new System.IO.StringWriter();

        System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);


        GridView1.AllowPaging = false;
        BindData();
        GridView1.RenderControl(htmlWrite);

        Response.Write(stringWrite.ToString());

        Response.End();

        GridView1.AllowPaging = true;
        BindData();

    }

导出成功！
注意如果数据源是NorthWind中的Products表（原因不清楚，应该还有其他的数据源也会出现这种情况）
会出现异常
只能在执行 Render() 的过程中调用 RegisterForEventValidation；有两种方法可以解决这个问题：
1.修改web.config(不推荐)<pages enableEventValidation ="false" ></pages>
2.直接在导出Execl的页面修改

<%@ Page Language="C#" EnableEventValidation = "false" AutoEventWireup="true"

 CodeFile="ExportGridView.aspx.cs" Inherits="ExportGridView" %>