Hi ramco1917,
Check this example. Now please take its reference and correct your code.
Controller
public class HomeController : Controller
{
// GET: Home
public ActionResult Index()
{
return View();
}
[HttpPost]
public ActionResult Index(string Name)
{
return View();
}
}
View
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Index</title>
<script type="text/javascript" src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" />
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" />
<script type="text/javascript" src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<style type="text/css">
.invalid input:required:invalid {
background: #BE4C54;
}
.invalid input:required:valid {
background: #17D654;
}
</style>
<script type="text/javascript">
$(function () {
Array.prototype.filter.call($('.frmValidation'), function (form) {
form.addEventListener('submit', function (event) {
if (form.checkValidity() === false) {
event.preventDefault();
event.stopPropagation();
}
form.classList.add('was-validated');
}, false);
});
});
</script>
</head>
<body class="container">
<br />
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">
Open modal
</button>
@using (Html.BeginForm("Index", "Home", FormMethod.Post, new { @class = "frmValidation", @novalidate = "" }))
{
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<div class="form-group">
<label for="Name">Name</label>
<input type="text" class="form-control" id="txtName" placeholder="Enter Name" required>
<div class="invalid-feedback">
Please enter Name
</div>
</div>
<div class="form-check mb-1">
<input type="checkbox" class="form-check-input" id="IsActive" required>
<label class="form-check-label" for="IsActive">Active</label>
<div class="invalid-feedback">
You must agree before submitting
</div>
</div>
</div>
<div class="modal-footer">
<button type="submit" class="btn btn-primary">Submit</button>
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
}
</body>
</html>
Screenshot
