/// <summary>
/// Returns the VersionKey
/// </summary>
/// <param name="extendedData">
/// The extended Data.
/// </param>
/// <returns>
/// The version key.
/// </returns>
public static Guid GetVersionKey(this ExtendedDataCollection extendedData)
{
return(!extendedData.ContainsVersionKey() ?
Guid.Empty :
extendedData.GetValue(Constants.ExtendedDataKeys.VersionKey).AsGuid());
}
