User defined Object

[Amremad]

Hello every one 

i need to create User Define Object , Like line or circle , i need to add something new have a new properties and rules. 

i know the block and Dynamic block , i neet something else , for example like the fittings in 3d plant, 

ex:  neet to make something like block attribute have a polyline this polyline can i extend it to any dirction 

i hope to i explan my problem.

[norman.yuan]

What you want, in AutoCAD programming, is "custom entity", which can only be done with ObjectARX C++, not with the .NET API.

However, depending on your real needs, the .NET API's "custom entity" solution is various Overrules (and Associtive Framework, in some sense).