usar retorno javascript em c sharp.

<div id="funcionario">
    <table>
        <tr>
            <th>Nome</th>
            <th>Email</th>
            <th>Telefone</th>
        </tr>
        @foreach (var a in ViewBag.Dados)
        {
            <tr" >
                <td ><a href="#login-box" class="login-window " lass="idCliente">@a.FullName</a></td>
                <td><a  href="#login-box" class="login-window" class="idCliente">@a.Emailaddress1</a></td>
                <td><a href="#login-box" class="login-window" class="idCliente">@a.Mobilephone</a></td>
            </tr>
             
        }
    </table>
   
//este é o jquery modal que aparecerá na tela, após o clique

    <div id="login-box" class="login-popup" >
        @using (Html.BeginForm("PegarDados", "PopUp", new { Class = "signin" }))
        {   
            <fieldset class="textbox">
                <label class="username">
                    <span>Nome</span><br />
                    <input id="username" name="nome" type="text" size="70" autocomplete="on" /><br />
                </label>
                <p class="password">
                    <span>Telefone</span><br />
                    <input id="password" name="password" type="password" size="40" /><br />
                </p>
                <input class="submit button" type="submit" value="Send" />
                <p>
                    <a class="forgot" href="#">Forgot your password?</a>
                </p>
            </fieldset>
        }
    </div>
</div>



<script type="text/javascript">
//este js aqui, eu implementei, e ele traz exatamente o nome do funcionário clicado
    nome2;
    [ ].forEach.call(document.querySelectorAll(".idCliente"), function (el) {
        el.addEventListener("click", function () {
            nome2 = el.innerHTML;
        });
    });



//a partir daqui, é o js do modal

    $(document).ready(function() {
        $('a.login-window').click(function(){

            //Getting the variable's value from a link 
            var loginBox = $(this).attr('href');

            //Fade in the Popup
            $(loginBox).fadeIn(300);

            //Set the center alignment padding + border see css style
            var popMargTop = ($(loginBox).height() + 24) / 2;
            var popMargLeft = ($(loginBox).width() + 24) / 2;

            $(loginBox).css({
                'margin-top': -popMargTop,
                'margin-left': -popMargLeft
            });

            // Add the mask to body
            $('body').append('<div id="mask"></div>');
            $('#mask').fadeIn(300);

            return false;
        });

        // When clicking on the button close or the mask layer the popup closed
        $('a.close, #mask').live('click', function () {
            $('#mask , .login-popup').fadeOut(300, function () {
                $('#mask').remove();
            });
            return false;
        });
    });

</script>