/// <summary>
/// Gets the unsigned long value from the specified <see cref="PropertyKey"/>
/// </summary>
/// <param name="key">The property being requested</param>
/// <returns>The unsigned long value of the specified property</returns>
public ulong GetUInt64(PropertyKey key)
{
ulong iVal;
_pItem.GetUInt64(key.MarshalledPointer, out iVal);
return(iVal);
}
