economy/Views/Days/NavTab.cshtml

<ul class="nav nav-tabs mt-3">
    <li class="nav-item">
        <a class="nav-link @(ViewData["type"].ToString() == "Holiday" ? "active" : "")" asp-controller="Days" asp-action="Holiday" asp-route-year="@Model.Request.Year">공휴일</a>
    </li>
    <li class="nav-item">
        <a class="nav-link @(ViewData["type"].ToString() == "Anniversary" ? "active" : "")" asp-controller="Days" asp-action="Anniversary" asp-route-year="@Model.Request.Year">기념일</a>
    </li>
    <li class="nav-item">
        <a class="nav-link @(ViewData["type"].ToString() == "Seasonal" ? "active" : "")" asp-controller="Days" asp-action="Seasonal" asp-route-year="@Model.Request.Year">24절기</a>
    </li>
    <li class="nav-item">
        <a class="nav-link @(ViewData["type"].ToString() == "Sundry" ? "active" : "")" asp-controller="Days" asp-action="Sundry" asp-route-year="@Model.Request.Year">잡절</a>
    </li>
</ul>