public void OUTEXCEL(string items,string where)

        {

            DataSet ds = new StudentBLL().GetTable(items,where);

            if (ds != null)

            {

                if (ds.Tables[].Rows.Count > )

                {

                    this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "", "<script>alert('导出数据超过最大限制行数，请添加条件再试！');</script>");

                    return;

                }

                GridView1.DataSource = ds.Tables[];

                GridView1.AllowPaging = false;

                GridView1.DataBind();

                Response.ClearContent();

                Response.BufferOutput = true;

                HttpContext.Current.Response.Charset = "UTF8";
 HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.Default;//注意编码

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

                HttpContext.Current.Response.ContentType = "application/ms-excel";

                // Response.ContentType = "application/excel";

                using (StringWriter sw = new StringWriter())

                {

                    HtmlTextWriter htw = new HtmlTextWriter(sw);

                    GridView1.RenderControl(htw);

                    Response.Write(sw.ToString());

                }

                Response.End();

            }

            else

            {

                Response.Write("<script>window.history.back(-1);</script>");

            }

        }

        public override void VerifyRenderingInServerForm(Control control)

        {

            // 方法重写

        }