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Creating c# library for mt4

I have worked on a simple DLL for mt4 by using visual studio 2013 c#. I added RGiesecke modules by using NuGet packeges. I can call simple procedures when it has only integer values. But when the function in the library has string values, mt4 cant find the function. Also, it makes wrong results for

MultiCurrency EA

I am new in MT5. I want to use MarketBookAdd to trade in many currincies in one EA, but I coulnt find a working example on this subject. Anyone who can help