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Development Tradyng System - Microsoft dot net - C++- or other language- MT4 manager API

Hi, i want develop a tradyng system. I'm a programmer. I think to use Microsoft dot net e i ask if there are some API to connect to metatrader? I've seen MT4 manager API, a C++ dll. Is possible use it? is free or must pay? There are some other API. My goal is connect my software developed in

MT4 manager api manager (C++dll)

Hi all, i'm using MT4 manager api manager (C++dll) but i have a problem: i can connect to server with function CManagerInterface::Connect() the problem is the login, user and password are ok, also the server where i connect, but the funcion CManagerInterface::Login() return error BAD_REQUEST. With