必須

using   System.Configuration;

         private string GetAppValue(string key)
        {
            string rc = string.Empty;
            try
            {
                rc=ConfigurationSettings.AppSettings.GetValues(key)[0].ToString();
            }
            catch (Exception ex)
            {
                throw;
            }

            return rc;
        }

例: strText=GetAppValue("date")   ;

app.config內容