How to add an active class to my bootstrap navbar in MVC with?

Hers is code example,

Whenever nav links clicked "navHelperExtension" class MakeActiveClass method adds active class to nav list item.

<ul id="topMenu" class="navbar-nav">
<li id="navHome" class="@navHelperExtension.MakeActiveClass("Index", "Home")">
<a id="acHome" class="nav-link" href="@Url.Action("Index", "Home")">Home </a>
</li>
<li id="navAbout" class="@navHelperExtension.MakeActiveClass("About","Home")">
<a id="acAbout" class="nav-link" href="@Url.Action("About", "Home")">About us </a>
</li>
<li id="navTeam" class="@navHelperExtension.MakeActiveClass("Team","Details")">
<a id="acTeam" class="nav-link" href="@Url.Action("Team", "Details")">Our Team</a>
 </li>
<li id="navContact" class="@navHelperExtension.MakeActiveClass("Contact","Details")">
<a id="acContact" class="nav-link" href="@Url.Action("Contact", "Details")">Contact </a>
 </li>
</ul>

C# static class and method to make current selected controller link active

public static class
navHelperExtension
    { 
  public static string MakeActiveClass(string controller)
        {
            System.Web.Mvc.UrlHelper urlHelper= ((System.Web.Mvc.WebViewPage)WebPageContext.Current.Page).Url;
 
            string result = "nav-item active";
 
       string controllerName =urlHelper.RequestContext.RouteData.Values["controller"].ToString();
 
            if (!controllerName.Equals(controller, StringComparison.OrdinalIgnoreCase))
            {
                result = "nav-item";
            }
 
            return result;
        }
}

If you want to show view without any surrounding _Layout page, you can set Layout=null.

Code sample,

With following custom error view, you displayed without surrounding _Layout page.

@{
    Layout = null;
}
<div class="alert alert-danger alert-dismissible fade show">
    <div>
        <h5>Error! </h5>
        <h6>Something went wrong, contact admin, or try again</h6>
    </div>
</div>

How to find nth highest salary using LINQ C# code, please provide code sample for same