protected void btnExport_Click(object sender, EventArgs e)

        {

            System.Web.HttpContext HC = System.Web.HttpContext.Current;

            HC.Response.Clear();

            HC.Response.Charset = "UTF-8";//这里原来是GB2312，导出是乱码，我改成UTF-8后还是乱码，为什么啊？

            HC.Response.Buffer = true;

            HC.Response.ContentEncoding = System.Text.Encoding.UTF8;

            HC.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode("查询结果打印", System.Text.Encoding.UTF8) + ".xls");

            HC.Response.ContentType = "application/excel";//如果要打印为excel格式，则换为"application/excel"

            this.EnableViewState = false;

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

            System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(sw);

            gvDataDisplay.RenderControl(htw);

            HC.Response.Write(sw.ToString());

            HC.Response.End();



        }