Metatrader EA and C# DLL

I need a DLL that can communicate with metatrader's expert advisor. The specs are: 1. the source code MUST be written in Visual C# 2. function to do http request and retrieve the result (4 float values in a text file, 1 value per line) 3. Metatrader EA that reads the strings from the dll request and puts them into local variables.