关于把数据库中的数据导出到Excel的问题？！

我有一段代码，不知正确不你试试

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Configuration;
namespace CommonFunction
{
/// <summary>
/// excel 的摘要说明。
/// </summary>
public class excel : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Button btnGetExcel;
protected System.Web.UI.WebControls.DataGrid dgExcel;

private void Page_Load(object sender, System.EventArgs e)
{
DataSet objDataset = new DataSet();
SqlConnection objConn = new SqlConnection();
objConn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionSqlServer"].ToString());
objConn.Open();
SqlDataAdapter objAdapter = new SqlDataAdapter("Select top 5 * from customers where country='USA'",objConn);
objAdapter.Fill(objDataset);
DataView oView = new DataView(objDataset.Tables[0]);
dgExcel.DataSource = oView;
dgExcel.DataBind();
objConn.Close();
objConn.Dispose();
objConn = null;
if(Request.QueryString["bExcel"] == "1")
{
Response.ContentType = "application/vnd.ms-excel";

Response.Charset = "";

//关闭 ViewState
EnableViewState = false;
System.IO.StringWriter tw = new System.IO.StringWriter();//将信息写入字符串
System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);//在WEB窗体页上写出一系列连续的HTML特定字符和文本。
//此类提供ASP.NET服务器控件在将HTML内容呈现给客户端时所使用的格式化功能
//获取control的HTML
dgExcel.RenderControl(hw);//将DATAGRID中的内容输出到HtmlTextWriter对象中
// 把HTML写回浏览器
Response.Write(tw.ToString());
Response.End();
}

}

#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.btnGetExcel.Click += new System.EventHandler(this.btnGetExcel_Click);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void btnGetExcel_Click(object sender, System.EventArgs e)
{
Response.Redirect("excel.aspx?bExcel=1");
}

}
}

明白了～～呵呵
Response.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312");