Remote API Integration with C#

Hello,

I  just needed to integrate a real-time information to an already existing windows application developed in C#.  we are in a procees of implementing a C# HTTP POST handler.

I want to hear your recommendation if it is appropriate to pass the whole command text as URL for the HTTPWebRequest or is there any possibility of passing parameter values as key-value pair. we tested both and the first works but the second is returning error:4 (Invalid Input), I need your kindly advise in regards.

Thanks !