Hi rani,

Check this example. Now please take its reference and correct your code.

Database

For this example I have used of Northwind database that you can download using the link given below.

Download Northwind Database

Namespaces

using System.Configuration;
using System.Data;
using System.Data.SqlClient;

Controller

public class HomeController : Controller
{
    // GET: /Home/
    public ActionResult Index()
    {
        return View();
    }
    [HttpPost]
    public JsonResult GetEmployees(int from, int to)
    {
        List<Employee> employees = new List<Employee>();
        string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        DataTable dt = new DataTable();
        using (SqlConnection con = new SqlConnection(constr))
        {
            using (SqlCommand cmd = new SqlCommand())
            {
                cmd.CommandText = "SELECT EmployeeID,FirstName,LastName,City,Country FROM Employees WHERE EmployeeID BETWEEN @From AND @To";
                cmd.CommandType = CommandType.Text;
                cmd.Connection = con;
                cmd.Parameters.AddWithValue("@From", from);
                cmd.Parameters.AddWithValue("@To", to);
                con.Open();
                using (SqlDataReader sdr = cmd.ExecuteReader())
                {
                    while (sdr.Read())
                    {
                        employees.Add(new Employee
                        {
                            Id = Convert.ToInt32(sdr["EmployeeID"]),
                            Name = sdr["FirstName"] + " " + sdr["LastName"],
                            City = sdr["City"].ToString(),
                            Country = sdr["Country"].ToString()
                        });
                    }
                }
                con.Close();
            }
        }
        return Json(employees);
    }

    public class Employee
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string City { get; set; }
        public string Country { get; set; }
    }
}

View

<div ng-app="MyApp" ng-controller="MyController">
    Min Value:<input type="number" ng-model="rangeSlider.minValue" />
    <br />
    Max Value:<input type="number" ng-model="rangeSlider.maxValue" />
    <br />
    <rzslider rz-slider-model="rangeSlider.minValue" rz-slider-high="rangeSlider.maxValue"
        rz-slider-options="rangeSlider.options"></rzslider>
    <button type="button" ng-click="Search()">
        Search</button>
    <hr />
    <table>
        <tr>
            <th>Id</th>
            <th>Name</th>
            <th>City</th>
            <th>Country</th>
        </tr>
        <tr ng-repeat="employee in Employees">
            <td>{{employee.Id}}</td>
            <td>{{employee.Name}}</td>
            <td>{{employee.City}}</td>
            <td>{{employee.Country}}</td>
        </tr>
    </table>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.5/angular.js"></script>
    <link rel="stylesheet" href="https://rawgit.com/rzajac/angularjs-slider/master/dist/rzslider.css" />
    <script type="text/javascript" src="https://rawgit.com/rzajac/angularjs-slider/master/dist/rzslider.js"></script>
    <script type="text/javascript">
        var app = angular.module('MyApp', ['rzSlider'])
        app.controller('MyController', function ($scope, $http, $window) {
            $scope.rangeSlider = {
                minValue: 1,
                maxValue: 9,
                options: {
                    floor: 1,
                    ceil: 9,
                    step: 1,
                    noSwitching: true
                }
            };
            $scope.Search = function (date) {
                $http({
                    method: 'POST',
                    url: 'Home/GetEmployees',
                    params: { from: $scope.rangeSlider.minValue, to: $scope.rangeSlider.maxValue }
                }).then(function (response) {
                    $scope.Employees = response.data;
                });
            }
        });
    </script>
</div>

Screenshot