How to assign required field validator in red color on text-box in view mvc 4 ?

below code is my view am trying to add required field validator in red color on text-boxes( txtValue, txtLocation)..

Note: i have set if condition in this view that you can see below. textboxes are called in ID

<div class="searchform cf">
@using (Html.BeginForm())
{
<input type="search" name="txtValue" id="txtValue" value="@Session["searched"]" placeholder="Need Service ? ">

<input type="search" name="txtLocation" id="txtLocation" value="@Session["location"]" placeholder=" City or State">

<button type="submit" value="Search" style="margin-top: 5px;">Search</button>
}
</div>
<div style="margin: 35px 0px 0px 90px">

@if (ViewBag.Message == true)
{
<label id="lblMessage" title="Please enter keyword" style="color:red;">Please enter keyword...!</label>
}
else
{
if (Model != null)
{
if (Model.Count() != 0)
{
<div>
<h2 style="font-size: 15px;">Searched for "@Session["searched"]"</h2>
</div>
 <div>
@foreach (var item in Model)
 {
<div class="tiptext">
Map
</div><hr />
<div class="description_body">
^__b>ZipCode <h4 class="des">@item.ZipCode</h4>
@Html.ActionLink("Book An Appointment", "CalendarView", "Appt", new { id = @item.UserID }, null)
@*@Html.ActionLink("Book An Appointment", "Popup", "Search", new { @class = "openDialog", data_dialog_id = "aboutlDialog", data_dialog_title = "Additinal Customer" })*@
</div>
</div>
</div>
</div>
</div>
</div>
}
</div>
}
else
{
<label id="lblErrorMsg" title="Record not fount...!" style="color:red;">Record not found...!</label>
}
}
}
</div>
</div>