C#

<script>
    $(document).ready(function () {
        $('.profile_boxes').click(function () {
            var val = $(this).attr('id');

            $('.profile_boxes').css('background', '#fff');
            $('.profile_boxes').css('border', '1px solid #ededed');

            $("#" + val).css('background', '#f6f6f6');
            $("#" + val).css('border', '1px solid #f55');


            $.ajax({
                url: '@Url.Action("RenderProfilePartials", "NewProfile")',
                data: { 'profile': val },
                cache: false,
                type: "POST",
                dataType: "html",
                success: function (data, textStatus, XMLHttpRequest) {
                    console.log(val);
                    $('#profilePartials').html(data);
                },
                error: function (data, textStatus, XMLHttpRequest) {
                    console.log(data);
                }
            });
        });
    });
</script>
<div class="centering col-lg-6 logged_in_mainboxes">
    <h2>What are you?</h2>
    <div id="band" class="col-lg-4 profile_boxes">
        <h3>Band</h3>
    </div>
    <div id="musican" class="col-lg-4 profile_boxes">
        <h3>Musican</h3>
    </div>
    <div id="regular" class="col-lg-4 profile_boxes">
        <h3>Regular</h3>
    </div>

    @Html.ValidationSummary(false)

    <div id="profilePartials">

    </div>
</div>

<div id="band_info" class="col-lg-9 profileDesc">
        <p>Maybe some information about the band profile here.....</p>
        @using (Ajax.BeginForm("RegisterBand", "NewProfile", new AjaxOptions() { HttpMethod = "Post" }))
        {
            @Html.ValidationSummary(true, "", new { @class = "text-danger" })
            <div class="form-horizontal">
                <div class="form-group">
                    Bandname
                    <div class="col-md-10">
                        @Html.EditorFor(x => x.Name, new { htmlAttributes = new { @class = "form-control" } })
                        @Html.ValidationMessageFor(x => x.Name, "", new { @class = "text-danger" })
                    </div>
                </div>

                <div class="form-group">
                    Coverpicture
                    <div class="col-md-10">
                        @Html.EditorFor(x => x.CoverPicture, new { htmlAttributes = new { @class = "form-control" } })
                        @Html.ValidationMessageFor(x => x.CoverPicture, "", new { @class = "text-danger" })
                    </div>
                </div>

                <div class="form-group">
                    Description
                    <div class="col-md-10">
                        @Html.EditorFor(x => x.Description, new { htmlAttributes = new { @class = "form-control" } })
                        @Html.ValidationMessageFor(x => x.Description, "", new { @class = "text-danger" })
                    </div>
                </div>

                <div class="form-group">
                    <div class="col-md-offset-2 col-md-10">
                        <input type="submit" value="Spara" class="btn btn-success" />
                    </div>
                </div>
            </div>
        }
</div>

[HttpPost]
public ActionResult RegisterBand(BandProfileModel model)
{

    if (ModelState.IsValid == false)
    {
        return PartialView("_BandRegisterPartial", model);
    }


    return View("Index");
}

[WebMethod (EnableSession = true)]
        public string GetTasksCountWebMethod()
        {
            int result;
            
            if (Session["tasks"] == "" || Session["tasks"]==null)
            {
         //somecode
                Session["tasks"] = result.ToString();
                return result.ToString();
            }
            else
            {
                return Session["tasks"].ToString();
            }
           
        }