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Thanks for the reply.
I was looking forward for a proper documentation for this interface. Which version of DLL will work on 3700 SIM and more information of ISL specially for 3700.
I only found this document : http://files.engineering.com/download.aspx?folder=3c39bb5d-4499-43c6-8d45-66fcd2db03ea&file=3700_-_SIM_Guide.pdf for guidelines. Which was not much enough for technical feasibility study.
Anyway i tried alot of combinations of .Net 3.5 to 4.5 , Win32 C and C++ DLLs with different different versions,properties and configurations. Finally i found the solution and all of them (C,C++,.Net) DLLs worked on 3700 SIM.
Now i could pass the data from ISL to DLL and vice versa, and i also found that this is far different from Simphony SIM ( ISL , DLL )