protected void RemoveDataSource(DataSource dataSource)
 {
     if (dataSource != null)
     {
         DataSourceManager.RegisterDataSource(dataSource);
     }
 }
 protected void AddDataSources(IEnumerable <DataSource> dataSources)
 {
     if (dataSources != null)
     {
         foreach (DataSource dataSource in dataSources)
         {
             DataSourceManager.RegisterDataSource(dataSource);
         }
     }
 }