Validation issue in Asp.net Mvc4

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ASP.NET

MVC4

This is my model.

public class Model1
    {
        [Required(ErrorMessage="Username must not be blank")]
        public string Username { get; set; }
        [Required(ErrorMessage="Password should match")]
        public string Password { get; set; }
    }

This is my controller.

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

        [HttpPost]
        public ViewResult Index(Model1 model1)
        {
            if (ModelState.IsValid)
            {
                if (model1.Username == "adm" && model1.Password == "adm")
                {
                    return View("FWMenu", model1);
                }
                else
                {
                    return View();
                }
            }
            return View();
        }

This is my view.

<h1>
		Log-in</h1>
	<br />
	@Html.ValidationSummary()
	@using (@Html.BeginForm())
 {
		<p>@Html.TextBoxFor(x => x.Username)</p>
		<p>@Html.TextBoxFor(x => x.Password)</p>
		<br />
		<p>
			<input type="submit" value="Login" /></p>
		
 }
</div>

My validation is working perfectly. My problem is that when i am keeping my username and password field blank and clicking on login, the whole page is getting refreshed to show me the validation. But i do not want my full page to get refreshed. Is it possible? If yes then what is the solution?