untitled

Model
namespace ArithmeticMVC.Models
{
 public class Calculator
 {
 public double Number1 { get; set; }
 public double Number2 { get; set; }
 public required string Operation { get; set; }
 public double Result { get; set; }
 }
Contoller
Remove existing code inside HomeController and replace with:
Using Microsoft.AspNetCore.Mvc;
Using ArithmeticMVC.Models;
namespace ArithmeticMVC.Controllers
{
 public class HomeController:Controller
 {

 //GET Method
 public IActionResult Index()
 {
 return View();
 }
 //POST Method
 [HttpPost]
 public IActionResult Index(Calculator calc)
 {
 switch(calc.Operation)
 {
 case "+":
 calc.Result = calc.Number1 + calc.Number2;
 break;
 case "-":
 calc.Result = calc.Number1 - calc.Number2;
 break;
 case "*":
 calc.Result = calc.Number1 * calc.Number2;
 break;
 case "/":
 if (calc.Number2!=0)
 {
 calc.Result = calc.Number1 / calc.Number2;
 }
 break;
 }
 return View(calc);
 }
 }
 }
 View
 @model ArithmeticMVC.Models.Calculator
 <h2>Arithmetic Operations</h2>
<form method="post">
<label>Enter Number1</label><br/>
<input type="number" step="any"asp-for="Number1"/>
<br/><br/>
<label>Enter Number2</label><br/>
<input type="number" step="any"asp-for="Number2"/>
<br/><br/>
<label>Select Operation</label><br/>
<select asp-for="Operation">
<option value="+">Addition</option>
<option value="-">Subtraction</option>
<option value="*">Multiplication</option>
<option value="/">Division</option>
</select>
<br/><br/>
<input type="submit" value="Calculate"/>
</form>
<br/>
@if(Model!=null)
{
<h3>Result=@Model.Result</h3>
}