Issue with View ActionResult on Button Click in MVC 5

Hi Tiny Wang-MSFT,

It did not resolve my issue . In the Typescript, the very first line you have is

@model WebAppDefIdentity.Models.MovieGenreViewModel

But, in my application, I have @model IEnumerable<MyProject.Models.MyModel>

My code wasn't working. If I replace it to use your code then I get an error:

The type or namespace name 'Routing' does not exist in the namespace 'System.Web'

Below is an verified working example using your code. I took the liberty of fixing several bugs. The code is a little different than the original but it does solve your use case, "All I am trying to do is to Filter records on the page by passing a "True" of "False" from button click.".

Controller (with mock DbContext):

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcBasic.Controllers
{
    public class cnStudents
    {
        public cnStudents()
        {
            Students = new List<Student>() {
                new Student()
                {
                    StudentID = 1,
                    EnrollmentDate = DateTime.Now.AddMonths(-5),
                    FirstName = "Foo",
                    LastName = "Bar",
                    IsEnrolled = true
                },
                new Student()
                {
                    StudentID = 2,
                    EnrollmentDate = DateTime.Now.AddMonths(-3),
                    FirstName = "Les",
                    LastName = "Paul",
                    IsEnrolled = false
                },
                new Student()
                {
                    StudentID = 3,
                    EnrollmentDate = DateTime.Now.AddMonths(-2),
                    FirstName = "Leo",
                    LastName = "Fender",
                    IsEnrolled = true
                },
                new Student()
                {
                    StudentID = 4,
                    EnrollmentDate = DateTime.Now,
                    FirstName = "Slash",
                    LastName = "",
                    IsEnrolled = false
                }
            };     
        }
        public List<Student> Students { get; set; }

        public void Dispose() { }
    }

    public class Student
    {
        public Student() {}
        public int StudentID { get; set; }  
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public DateTime EnrollmentDate { get; set; }
        public bool IsEnrolled { get; set; }

    }

    public class StudentsController : Controller
    {
        private cnStudents db = new cnStudents();
        public ActionResult Index(string sortOrder, string searchString, bool? isFeaturedFilter = null)
        {
            var subjects = from m in db.Students select m;
            ViewData["NameSortParm"] = String.IsNullOrEmpty(sortOrder) ? "name_desc" : "";
            ViewData["DateSortParm"] = sortOrder == "Date" ? "date_desc" : "Date";
            switch (sortOrder)
            {
                case "name_desc":
                    subjects = subjects.OrderByDescending(s => s.FirstName);
                    break;
                    subjects = subjects.OrderByDescending(s => s.LastName);
                    break;
                case "Date":
                    subjects = subjects.OrderBy(s => s.EnrollmentDate);
                    break;
            }
            if (!String.IsNullOrEmpty(searchString))
            {
                if (!string.IsNullOrEmpty(searchString))
                {
                    subjects = subjects.Where(s => s.LastName == searchString
                    || s.FirstName.Contains(searchString)
                    || s.FirstName.ToString().Contains(searchString)
                    );
                }
            }

            if (isFeaturedFilter != null)
            {
                subjects = subjects.Where(s => s.IsEnrolled == isFeaturedFilter);
                ViewBag.IsFeaturedFilter = isFeaturedFilter;
            }

            ViewBag.CurrentSearch = searchString;
            return View(subjects);
        }
        //public ActionResult IsEnrolled(bool? isFeaturedFilter = null)
        //{
        //    var students = from m in db.Students select m;
        //    students = students.Where(s => s.IsEnrolled == isFeaturedFilter);
        //    ViewBag.IsFeaturedFilter = isFeaturedFilter;
        //    return View(subjects);
        //}
        public ActionResult SearchAct()
        {
            return View();
        }
        [HttpPost]
        public ActionResult SearchAct(string nameToFind)
        {
            ViewBag.SearchKey = nameToFind;
            return View();
        }
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                db.Dispose();
            }
            base.Dispose(disposing);
        }
    }
}

Index View:

@model IEnumerable<MvcBasic.Controllers.Student>

@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Index</h2>

<form method="get" action="@Url.Action("Index")">
    <p>
        Search by Last Name: <input type="text" name="searchString" value="@ViewBag.CurrentSearch" />
        <input type="submit" value="Search" class="btn btn-default" /> @*| <a asp-action="Index">Go Back</a>*@
        @Html.ActionLink("Show All", "Index")
    </p>

    <div class="btn-group" role="group" aria-label="Filter by IsFeatured">
        <button type="button" class="btn btn-primary @((ViewBag.IsFeaturedFilter == null) ? " active" : "" )"
                onclick="location.href='@Url.Action("Index", "Students" )'">
            All
        </button>
        <button type="button" class="btn btn-primary @((ViewBag.IsFeaturedFilter == true) ? " active" : "" )"
                onclick="location.href='@Url.Action("Index", "Students" , new { isFeaturedFilter=true })'">
            Enrolled
        </button>
        <button type="button" class="btn btn-primary @((ViewBag.IsFeaturedFilter == false) ? " active" : "" )"
                onclick="location.href='@Url.Action("Index", "Students" , new { isFeaturedFilter=false })'">
            Not Enrolled
        </button>
    </div>
</form>

<table class="table">
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.FirstName)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.LastName)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.EnrollmentDate)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.IsEnrolled)
        </th>
    </tr>

    @foreach (var item in Model)
    {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.FirstName)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.LastName)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.EnrollmentDate)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.IsEnrolled)
            </td>
        </tr>
    }

</table>