How to set drop down list items in ASP.NET Core from database

DropDownListTagHelper.txt

In action method of HomeController.cs :
[HttpGet]
public ActionResult TestAction()
{
    ViewBag.Categories = db.Categories.ToList();
    return View();
}

in View (TestAction.cshtml):
<select asp-for="Menu.Id" asp-items="@(new SelectList(@ViewBag.Categories,"Id","Title"))">
    <option disabled selected>Choose Category</option>
</select>