Unable to send parameters to server action method using angularjs $http request

I am doing Ajax requests to server in following way:

App Setup:

var appRoot = angular.module('demoApp', ['ngRoute', 'ngResource']);
appRoot.config(['$routeProvider', function($routeProvider) {
         $routeProvider
         .when('/', { templateUrl: '/ngPartials/_Login.html', controller: 'LoginCtrl' })
         .otherwise({ redirectTo: '/ngPartials/_Login.html', controller: 'LoginCtrl' });
        }
]);

Factory:

appRoot.factory('LoginResource', function ($http) {
    var loginResource = {
        response:{},
        get: function (param) {
            $http.get('/Login/Login', param).
             success(function (data, status, headers, config) {

                 this.response = data;
             }).
             error(function (data, status, headers, config) {
                 alert('error');

            });
        }
    }
    return loginResource;
});

Controller:

appRoot.controller('LoginCtrl', function ($scope, LoginResource) {
    //Make a get request on login resource
    $scope.User = LoginResource.get(
    {
       Role: val,
       Email_Id: $scope.Email,
       Pwd: $scope.Password
    }, function (response) { 
    //do someting in callback function
    });
});

But I don't know what wrong I am doing in above code, the parameters (Role,Email_Id,Pwd) are not being binded to my server Action method when I do get request to it. The method is hit properly but the model values are not being binded.

server side model:

public class LoginModel
{
    public string Role { get; set; }
    public string Email_Id { get; set; }
    public string Pwd { get; set; }
    public bool IsEmailValidation { get; set; }

}

Action method:

    [HttpGet, ActionName("Login")]
    public JsonResult Login(LoginModel oLogin)
    {
       ...
    }

When I call above action method from angular, the method is being hit, but all the properties in the object oLogin are null. What going wrong with my above code?

EDIT:

Previously instead of $http, I was using $resource as follows and everything was working exactly fine.

appRoot.factory('LoginResource', function ($resource) {
    return $resource('/Login/Login');
});