How to send data from iOS to C# using "remoting" library?

Question

// question

I have an existing c# program that uses Microsoft .net's "remoting" SDK.

I want to send some data from a new iOS app to this c# program.

The existing c# program is huge (with existing clients) and I am not sure if rewriting the entire thing in asmx is a good idea.

I have looked at other online sources, they all say no, but some mentioned Xamarin (wfc server).

Xamarin.Forms Connection to Wcf Service from iOS

I don't mind converting to iOS app to Xamarin, but just want to get some expert opinion before going ahead.

I am also open to other options as well.

Thank you very much for you help.

// what I have tried

I have looked at various stack-overflow posts & online sources and tried to use regular soap request instead, but I realized that this requires restructuring of entire c# codebase.

I would like to know if there is a smarter way to do this.

// update

I've tried Xamarin and it keeps crashing for some reason... when I try to use .dll reference.