/// <summary>
/// Gets the extension data.
/// </summary>
/// <typeparam name="TTKey">The type of extension data desired.</typeparam>
/// <returns>T.</returns>
/// <remarks>Chain extensions can use this to store data source specific data. The key should be a data type defined by the extension.
/// Transactional data sources should override this method and return the value held by their parent data source.</remarks>
public override TTKey GetExtensionData <TTKey>()
{
return(m_BaseDataSource.GetExtensionData <TTKey>());
}
