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Looking for solution for cross platform development windows application and web application

I got project that will run on windows and web. I wonder if there is a solution to create that as a cross platform application . If you have any experience or any solution please let me know.

Create web service(s) for your business.
Consume them in both windows application and web application.
Configuring is the key here.
When it comes to consuming web services,may be little challenging for authentications, authorizations and marshalling data, but it is possible.
You can choose any programming language for creating web services. But languages like Java, C# or vb.net has good supporting libraries and easy to do. Any how your question tag says C#, dotnet frame work has good support for webservices using WCF.

You can share a lot of UI code between a desktop and web application using a framework like Electron. This is the method that a lot of popular products with both web and desktop apps (like Slack, Discord, and Ghost to name a few) use.

How do I deploy a 3-tier architecture C# solution?

Please forgive the newbie question. I've spent the last three hours researching this, and I can't quite find the right answer, or perhaps I just don't believe it's as simple as it looks.
I need to deploy an application such that an application on the server-side does the heavy lifting, database wise, and the client-side version is fairly lightweight.
I have built a Data Access Layer class library (or at least a dll) that does all the heavy lifting. I have built a Windows Forms application that could serve as the lightweight client. They see each other. They talk to each other. They work happily together.
I'm kind of hoping all I need to do is put the dll on the server, point the reference to it in the client, and all will be well. The dll will run its code on the server, using server resources, and the client will run on the client. It's what the various websites seem to suggest, but it looks too simple.
Do I need to configure something like remoting on the server? Do I need to use System.Runtime.Remoting for something? Or is it really as simple as it looks?
Again, please forgive so basic a question.

what you are trying to do is build Client/Server application,
where you have
Client
client domainDomain
server Domain
Dal
Data
you will need to enstablish http conntection between client domain and server domain .
the common way to do this is using WCF
Explain the different tiers of 2 tier & 3 tier architecture?
http://www.codeproject.com/Tips/642296/Hello-World-Basic-Server-Client-Example-of-WCF
http://www.codeproject.com/Articles/14493/WCF-Basic-Client-Server
oh and welcome to stack overflow!

Well, you could use System.Runtime.Remoting, but that is a deprecated technology, i suggest using WCF for communicating between the client and the server.

Scheduler program in C#

I am working on a client server project. Client is built in WPF using mvvm pattern and service is built using WCF. I have to perform some action on a specific event which I am able to do by calling some service functions. I will have to do call the same function on a regular basis at a specific time as configured in database. Can somebody suggest a better approach to achieve this. I am thinking of creating a windows service specifically to do such things. Is that a good choice ? Thanks a lot.

Create a console app that calls the service, and add a scheduled task in Windows to run the console app at a specified interval. It is a lot easier and cleaner than creating a service for such a simple application.

I think the best approach is to use an already created (and properly tested) scheduling system or library instead of developing your own. For a Java project I worked on, I used the Quartz library, which handled the job quite nicely and it integrated easily into said project. It has a .NET port here, never used it but I suppose it works similarly.

how to expose API from windows service application

I am working on windows service application that is suppose to perform some tasks. Apart from these tasks, I want to make some of the service functionality available on call. Means, totally separated application should be able to create an object of type specified on windows service and can call some of the functions, decalred public, ofcourse.
Let me know if is there any way to expose the functionality through API or something. if yes, kindly guide me to any tutorial or example of that.
Thanks in advance.....

I think what you are looking for is a windows service using WCF to communicate with other applications.
Here's a pretty neat tutorial you can work through:
http://tech.pro/tutorial/855/wcf-tutorial-basic-interprocess-communication

Call a C# service through C++

I want to make a call to a web service that is written in C#, through Visual C++ or C++ in Visual Studio 2010. I searched on web but was not able to find any point to point document. It would be a great help if you will tell me.

If you're prepared to go with managed C++ then you can use WCF.
However, if this isn't an option then your best bet is to go with a socket approach. You'll need some cross-language way to represent the data your sending from C++ to C# and back again. Google Protobuf will help here as there are frameworks for both languages, in addition to many others.

A web service uses something JSON or XML as an interface and is inherently language independent. You would have to look for libraries that can create requests to the web service. For example if your web service in C# uses SOAP (XML) which it would if you created the default web service in Visual Studio you could create your own request in XML in accordance to the specifications of SOAP:
http://www.w3.org/TR/2000/NOTE-SOAP-20000508/
or use one of the libraries mentioned in this question:
Generic WebService (SOAP) client library for C++

Have a look at Walkthrough: Accessing an XML Web Service Using C++.