This documentation was taken from http:https://mtapi4.net/how-to-use/

MetaTrader API for using with .NET framework

Download executable files from release page https://github.com/vdemydiuk/mtapi/releases

1. Install MtApi to program’s folder ( by default “C:\Program Files” ).
2. Install MtApi expert into the terminal:

• Metatrader 5
  Click on MtApi5.ex5 from “Start -> MtApi5 -> Expert”. Expert will be added to the terminal automatically.

3. Setup expert’s options:

• Metatrader 5
  Tools -> Options -> Expert Advisors:
  

4. Attach MtApi Expert Advisor to Chart.

• Metatrader 5
  

5. Set parameters of MtApi Expert:
   
   Port defines a port of connection.
   It has default values: 8228 (MT5).

6. Add References to MtApi.dll and Newtonsoft.Json.dll into your project in Visual Studio from installed MtApi folder

7. Enjoy! (see examples for using MtApi MtApi5TestClient.zip).