/// <summary>Page Load</summary>
        public void Page_Load
        (
            object sender,
            EventArgs e
        )
        {
            string exceptionMessage;

            ServerMapPath = this.MapPath("");

            if (ServerMapPath != null)
            {
                FilenameConfigurationXml = Path.Combine(ServerMapPath, FilenameConfigurationXml);
            }

            UtilityExcel.ConfigurationXml
            (
                FilenameConfigurationXml,
                out exceptionMessage,
                ref DatabaseConnectionString
            );
            if (exceptionMessage != null)
            {
                Feedback = exceptionMessage;
                return;
            }
        }
        /// <summary>SQLExcel</summary>
        public void SQLExcel()
        {
            string exceptionMessage;

            UtilityExcel.SQLExcel
            (
                DatabaseConnectionString,
                SQL.Text,
                FilenameExcel.PostedFile.FileName,
                out exceptionMessage
            );
            if (exceptionMessage != null)
            {
                Feedback = exceptionMessage;
            }
        }
        /// <summary>OpenExcel</summary>
        public void OpenExcel()
        {
            string  exceptionMessage;
            DataSet dataSet;

            UtilityExcel.ExcelOpen
            (
                FilenameExcel.PostedFile.FileName,
                UtilityExcel.ExcelConnectionType.OLEDB,
                out dataSet,
                out exceptionMessage
            );
            if (exceptionMessage != null)
            {
                Feedback = exceptionMessage; return;
            }
            GridViewExcel.DataSource = dataSet;
            GridViewExcel.DataBind();
        }