我上一篇文章介绍了Excel导入到DataTable的方法，总觉得少些什么，这篇我就将DataTable

        中的数据导出到Excel并提供下载的方法记录下来。

        调用如下：

        CreateExcel(dtexcel, "application/ms-excel", excel);

        方法如下：

        /// <summary>
        /// DataTable中的数据导出到Excel并下载
        /// </summary>
        /// <param name="dt">要导出的DataTable</param>
        /// <param name="FileType">类型</param>
        /// <param name="FileName">Excel的文件名</param>
        public void CreateExcel(DataTable dt, string FileType, string FileName)
        {
            Response.Clear();
            Response.Charset = "UTF-8";
            Response.Buffer = true;
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            Response.AppendHeader("Content-Disposition", "attachment;filename=\"" + System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) + ".xls\"");
            Response.ContentType = FileType;
            string colHeaders = string.Empty;
            string ls_item = string.Empty;
            DataRow[] myRow = dt.Select();
            int i = 0;
            int cl = dt.Columns.Count;
            foreach (DataRow row in myRow)
            {
                for (i = 0; i < cl; i++)
                {
                    if (i == (cl - 1))
                    {
                        ls_item += row[i].ToString() + "\n";
                    }
                    else
                    {
                        ls_item += row[i].ToString() + "\t";
                    }
                }
                Response.Output.Write(ls_item);
                ls_item = string.Empty;
            }
            Response.Output.Flush();
            Response.End();
        }