is anyone know to develop dll file for MT4 or MT5 using Visual Studio 6 or Visual Studio 2008 .net.
Any Visual Studio for C++
for MQL5 : Guide to exchange data, a dll for MQL5 in 10 minutes
for MQL4 : Patrick S. Nouvion video dll for MQL4
There are several topics in forum regarding C++ dll.
And please ask your question about .dll for MQL4 in MQL4 forum.