C# Online Compiler | .NET Fiddle

using System;
using System.ComponentModel.DataAnnotations;
using MvcApp;

namespace MvcApp
{
	public class UserViewModel
	{
		public int Id
		{
			get;
			set;
		}

		public string Username
		{
			get;
			set;
		}

		public string FirstName
		{
			get;
			set;
		}

		public string LastName
		{
			get;
			set;
		}
	}
}

@model IEnumerable<MvcApp.UserViewModel>
@{
	Layout = null;
}

<!DOCTYPE html>
<!-- template from http://getbootstrap.com/getting-started -->

<html lang="en">
	<head>
		<meta charset="utf-8">
		<meta http-equiv="X-UA-Compatible" content="IE=edge">
		<meta name="viewport" content="width=device-width, initial-scale=1">
		<title>Bootstrap 101 Template</title>

		<!-- CSS Includes -->
		<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
		
		<style type="text/css">

			.field-validation-error {
				color: #ff0000;
			}

		</style>
	</head>
	
	<body>

		<div class="container">
			<!-- Create the edit form in your controller -->
			<form id="edit">
				<div class="row">
					 <input type="hidden" id="userId" name="Id">
					 <div class="col-md-2">
					 	<label for="username">Username:</label>
					 	<input type="text" id="username" name="Username" class="form-control">
					 </div>
					 <div class="col-md-2">
					  	<label for="firstname">First Name:</label>
					 	<input type="text" id="firstname" name="FirstName" class="form-control">
					 </div>
					 <div class="col-md-2">
					  	<label for="lastname">Last Name:</label>
					 	<input type="text" id="lastname" name="LastName" class="form-control">
					</div>

				</div>
				<input type="submit" class="btn btn-info" value="Save">
			</form>
		<!-- Display your users as usual -->
		<table class="table">
			
			@foreach(var item in @Model){
				<tr>
					<td>
						@item.Username
					</td>
					<td>
						@item.FirstName
					</td>
					<td>
						@item.LastName
					</td>
					<td>
						<!-- Create dummy buttons to handle edit/delete -->
						<a href="#" class="btn btn-success edit-btn" data-id=@item.Id>Edit</a>|
						<a href="#" class="btn btn-danger delete-btn" data-id=@item.Id>Delete</a>
					</td>
				</tr>
			}
		</table>
		</div>

		<!-- JS includes -->
		<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
		<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
	
		<script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js"></script>
		<script src="//ajax.aspnetcdn.com/ajax/mvc/4.0/jquery.validate.unobtrusive.min.js"></script>
		
		<script type="text/javascript">
		       const deleteBtns = document.querySelectorAll(".delete-btn");
				deleteBtns.forEach((btn)=>{
					// Listen for clicks on your delete buttons, then send an ajax call back to your controller
					// for the Delete method, passing the id data-attribute to identify the record
					btn.addEventListener("click",function(){
						$.ajax({
							url: '@Url.RouteUrl(new{ action="Delete", controller="Home"})',
							data: {userId:parseInt(btn.dataset.id,10)},
							type: 'POST',
							dataType:"json",
							complete: function(resp) {
								alert(resp.responseText);
							}
						});
						//Hide (or delete) the row after a deletion is done to update the UI
						removeRow(btn);
					})
				})
				removeRow = (elemInRow)=>{
					$(elemInRow).closest("tr").hide();	
				}
				const form = document.getElementById("edit");
				// Hide the form initially
				$(form).hide();
		        const editBtns = document.querySelectorAll(".edit-btn");
				editBtns.forEach((btn)=>{
					// When an edit button is clicked, set the userId input field of the form
					// to point to the id of the record selected.
					// Then move the form into the same row.
					// Lastly, show the form.
					btn.addEventListener("click",function(){
						document.getElementById("userId").value=btn.dataset.id;
						$(form).appendTo($(btn).closest("td"));
						$(form).show();
					})
				})
				// Handle the form submit by passing it's input to the Edit function. 
				// Update the UI to reflect the changes.
				// Hide the form again and send feedback via an alert.
			    form.addEventListener("submit",function(event){
					event.preventDefault();
					$.ajax({
						url: '@Url.RouteUrl(new{ action="Edit", controller="Home"})',
						data: $(this).serialize(),
						type: 'POST',
						dataType: 'json',
						complete: function(resp) {
							const jsonOb = JSON.parse(resp.responseText);
							updateRow(jsonOb.Username,jsonOb.FirstName,jsonOb.LastName,$(form).closest("tr")[0]);
							$(form).hide();
							alert(`I saved: ${JSON.stringify(jsonOb)}`);
						}
					});
				})
				updateRow = (username, firstname, lastname,row)=>{
					const tds = $("td",row);
					$(tds[0]).text(username);
					$(tds[1]).text(firstname);
					$(tds[2]).text(lastname);
				}


		</script>
	</body>
</html>

        <script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js"></script>
 
@model IEnumerable<MvcApp.UserViewModel>
@{
    Layout = null;
}
​
<!DOCTYPE html>
<!-- template from http://getbootstrap.com/getting-started -->
​
<html lang="en">
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>Bootstrap 101 Template</title>
​
        <!-- CSS Includes -->
        <link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
        
        <style type="text/css">
​
            .field-validation-error {
                color: #ff0000;
            }
​

using System;
using System.Web.Mvc;
using System.Collections.Generic;

namespace MvcApp
{
	public class HomeController : Controller
	{
		[HttpGet]
		public ActionResult Index()
		{
			return View(GetUsers());
		}

		public List<UserViewModel> GetUsers()
		{
			//faux data from db
			var list = new List<UserViewModel>();
			for (int i = 0; i < 10; i++)
			{
				list.Add(new UserViewModel()
				{Id = i, Username = "User_" + i, FirstName = "UserFirst " + i, LastName = "UserLast " + i});
			}

			return list;
		}

		[HttpPost]
		public JsonResult Delete(int userId)
		{
			//perform deletion here
			/***************/
			return Json("I deleted " + userId);
		}

		[HttpPost]
		public JsonResult Edit(UserViewModel user)
		{
			//save data here
			/***************/
			//then return updated data as json
			return Json(user);
		}

	}
}

 
using System;
using System.Web.Mvc;
using System.Collections.Generic;
​
namespace MvcApp
{
    public class HomeController : Controller
    {
        [HttpGet]
        public ActionResult Index()
        {
            return View(GetUsers());
        }
​
        public List<UserViewModel> GetUsers()
        {
            //faux data from db
            var list = new List<UserViewModel>();
            for (int i = 0; i < 10; i++)
            {
                list.Add(new UserViewModel()
                {Id = i, Username = "User_" + i, FirstName = "UserFirst " + i, LastName = "UserLast " + i});
            }
​