MOD: Before I delete this, let this be known: If you post this level of lazy copypaste you WILL get banned.

Sure, here is the code for a simple web API in C# that acts like a basic calculator (can perform sum, subtraction and division based on user inputs):

csharp
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;

namespace CalculatorAPI
{
    public class ValuesController : ApiController
    {
        [HttpGet]
        public IEnumerable<int> Get()
        {
            return new[]
            {
                1,
                2,
                3,
                4,
                5,
            };
        }

        [HttpGet("{x}/{y}")]
        public int Calculate(int x, int y)
        {
            switch (Request.Headers["Operation"])
            {
                case "Add":
                    return x + y;
                case "Subtract":
                    return x - y;
                case "Divide":
                    return x / y;
                default:
                    throw new InvalidOperationException("Invalid operation");
            }
        }
    }
}
```
You can then use this JSON object to perform any calculations that you need to.
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