/// 该方法可以快速将dataset写为Excel文件，免去Excel.dll支持
    ///摘要:采用ADO方式,把DataSet数据快速导出到Excel
    ///用法: 1) ExcelExporter xls = new ExcelExporter(DataSet);  2) xls.Export(excelFileName);
    ///作者:魏孙鼎
    ///
    public class ExcelExporter
    {
        private DataSet dsSource = null;
        private string provider = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=Excel 8.0;";

        ///
        /// Constructor
        ///
        /// 要导出的数据源
        public ExcelExporter(DataSet ds)
        {
            dsSource = ds;
        }

        public bool Export(string fileName)
        {
            //前提判断
            if (fileName == null || fileName == "")
                return false;

            if (!fileName.EndsWith(".xls"))
                fileName += ".xls";

            if (dsSource == null)
                return false;