In ASP.NET MVC, you can use the Ajax.BeginForm helper to create a form that submits data asynchronously using AJAX. This allows you to update specific parts of the page without refreshing the entire page. Here's an example of how to use Ajax.BeginForm in MVC:

1. Ensure you have included the necessary script references in your view. The jquery.unobtrusive-ajax.js script is required for Ajax.BeginForm to work. You can include it in your view by adding the following script tag:

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-ajax-unobtrusive/3.2.6/jquery.unobtrusive-ajax.min.js"></script>

2. Create your form using the Ajax.BeginForm helper method. Here's an example:

@model AjaxBeginform.Models.Employee
@{
    ViewBag.Title = "Home Page";
}

<div class="jumbotron">
    <h1>Ajax Begin Form</h1>
    <p class="lead">ASP.NET is a free web framework for building great Web sites and Web applications using HTML, CSS and JavaScript.</p>
    <p><a href="https://asp.net" class="btn btn-primary btn-lg">Learn more &raquo;</a></p>
</div>

@using (Ajax.BeginForm("SubmitData", "Home", new AjaxOptions { HttpMethod = "POST", UpdateTargetId = "resultDiv", OnSuccess = "handleSuccess" }))
{
    <label>Name</label>
    @Html.TextBoxFor(x => x.Name)
    <label>Address</label>
    @Html.TextBoxFor(x => x.Address)
    <!-- form inputs here -->
    <input type="submit" value="Submit" />
}

<div id="resultDiv">
    <!-- result will be updated here -->
</div>


<script>
    function handleSuccess(result) {
        alert(result);
        // Handle the success response
    }
</script>

In this example, the Ajax.BeginForm method creates a form that will asynchronously submit data to the specified action method (ActionName) in the specified controller (ControllerName). The form data will be posted using the HTTP POST method.

The UpdateTargetId property of AjaxOptions is set to "resultDiv", which specifies that the response from the server should be rendered and updated in the element with the ID "resultDiv".

Now add a new class in the model and paste following code or create a class as per your requirement

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace AjaxBeginform.Models
{
    public class Employee
    {
        public string Name { get; set; }
        public string Address { get; set; }
    }
}

3. Implement the corresponding action method in your controller. This action method will handle the form submission and return a partial view or JSON result that will be updated in the specified target element.

using AjaxBeginform.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace AjaxBeginform.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        [HttpPost]
        public ActionResult SubmitData(Employee model)
        {
            // Process the form data and perform any necessary operations

            return Json("Success");
        }
    }
}

4. Optionally, you can handle additional events such as OnBegin, OnSuccess, OnFailure, etc., by adding properties to the AjaxOptions object in the Ajax.BeginForm method.

So this is how we can save data without reloading using Ajax Beginform in Asp.Net MVC.