System.Web.HttpContext.Current.Response.Clear();
        System.Web.HttpContext.Current.Response.Buffer = true;
        System.Web.HttpContext.Current.Response.Charset = "utf-8";
        System.Web.HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(strFileName,System.Text.Encoding.UTF8) + ".xls");
        System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
        System.Web.HttpContext.Current.Response.ContentType = "application/ms-excel";        System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("zh-CN", true);
        System.IO.StringWriter oStringWriter = new System.IO.StringWriter(myCItrad);
        System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);        dt.RenderControl(oHtmlTextWriter);
        System.Web.HttpContext.Current.Response.Write(oStringWriter.ToString().Replace("<td", "<td STYLE='MSO-NUMBER-FORMAT:\\@'"));
        System.Web.HttpContext.Current.Response.Buffer = false;
        System.Web.HttpContext.Current.Response.End();
这是导出Excel代码,怎么能在这里添加一段删除导出的Excel某一列的代码