Hi 虎 祝,
because this thread is quite old, I recommend to post a new question again, especially whether this discussion related to (I guess) CONNECT Edition Update 1 and today Update 4 is available.
In Update 4 you can use CreateCellElement1, CreateCellElement2 and CreateCellElement3 from Bentley.Interop.MicroStationDGN.dll assembly in the same way as in VBA and in C# in V8i.
With regards,
Jan