# Add two numbers

## Add two numbers

Let us add 2 numbers using mvc architecture. We could do this in a separate controller or in the existing home controller like shown below

## Controller Code

```csharp
public class HomeController : Controller
{
    [HttpGet]
    public IActionResult Index()
    {
        return View();
    }

    [HttpPost]
    public IActionResult Index(int firstNum, int secondNum)
    {
        int result = firstNum + secondNum;

        ViewBag.FirstNum = firstNum;
        ViewBag.SecondNum = secondNum;
        ViewBag.Result = result;

        return View();
    }
}
```

### View Code

```cshtml
@model int

<h1>Add Numbers</h1>

<form method="post">
    <label for="number1">Number 1:</label>
    <input type="number" name="firstNum" required>

    <label for="number2">Number 2:</label>
    <input type="number" name="secondNum" required>    
    
    <button type="submit">Add</button>
</form>

@if (ViewBag.Result != null)
{
        <p>The result of adding @ViewBag.FirstNum and @ViewBag.SecondNum is @ViewBag.Result.</p>
}
```

In ASP.NET Core MVC, there are three ways to pass data from a controller to a view:&#x20;

* using `ViewData`,&#x20;
* using `ViewBag`, and&#x20;
* using strongly-typed models.

{% hint style="info" %}
`ViewData` and `ViewBag` are similar in that they are both dictionaries that can be used to pass data from a controller to a view. However, they differ in their syntax. Since its introduction, `ViewBag` has become a popular choice for passing data between the controller and the view, due to its simplicity and ease of use.
{% endhint %}