How can we pass value from controller to view

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MVC3

I'm new to MVC 3

I have login page with username textbox and button to submit the request.
I'm calling the controller action through JQuery as shown below

<script type="text/javascript">
    $(document).ready(function () {
        $('#btnLogin').click(function () {
            document.location = '@Url.Action("Validateuser" , "Login")';
        });
        $('body').css("background", "#517EAD");
        $('body').css("margin", "0");
    });
</script>
<div style="background:white;text-align:right;padding:0px 50px;">
      <h2>Please Login</h2>
</div>

<div style="float:right;">
    <table border="0">
<tr>
    <td>
        <label id="lbllogin">LoginID:</label>        
    </td>
    <td>
            <input type="text" id="txtLogin" required placeholder="Prashant" style="border-radius:5px;background:orange;"/>
            <label style="color:Red;font-weight:bold;">@TempData["Msg"]</label>
    </td>
</tr>
<tr>
    <td></td>
    <td>
        <input type="submit" id="btnLogin" value="Login" style="border-radius:15px;background:silver;"/>
    </td>
</tr>
</table>
</div>

The controller takes 1 parameter as shown below

public ActionResult Validateuser(string userName)
        {
            Login objLogin = new Login();
            int intUser = objLogin.validateUser();
            TempData["Msg"] = "Invalid User";
            return RedirectToAction("Index","Login");
        }

How can i pass textbox value to the controller??
I there any other way to call the controller, apart the way I did through jquery??
Any idea how can i do??

thanks in advance