Thank you so much,, you did great.
My project is finished, I used this version of ojectarx :
"Autodesk_ObjectARX_2017_Win_64_and_32_Bit"
I know that this DLL is compatible with Autocad 2013 and higher versions, but what about .Net Framework version? Is it compatible with all version of .Net Framework and all windows ? I mean the DLL I've created is dependent on Net Framework versions?
My visual studio version is 2015 and I choosed version 4.5 of Net Framework, Actually I intend to create a DLL for all versions of autocad and windows, I just know I have to create one DLL for Autocad 2007 to 2012 and one DLL for Autocad 2013 to higher.
Someone told me I should use c++ to get rid of Net Framework version error.