sql 到Execl(asp.net)

我这是从GRIDVIEW中导出的,要添加引用

using System.IO;
using System.Text;


#region 导出报表
protected void Button6_Click(object sender, EventArgs e)
{
Export("application/ms-excel", "学生成绩报表.xls");
}
private void Export(string FileType, string FileName)
{
Response.Charset = "GB2312";
Response.ContentEncoding = System.Text.Encoding.UTF7;
Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8).ToString());
Response.ContentType = FileType;
this.EnableViewState = false;
StringWriter tw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(tw);
GridView1.RenderControl(hw);
Response.Write(tw.ToString());
Response.End();
}

public override void VerifyRenderingInServerForm(Control control)
{
//必须要
}

#endregion