Hi mahesh213,
Check this example. Now please take its reference and correct your code.
Controller 
public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View();
    }
    public JsonResult GetAll()
    {
        List<Employee> employees = new List<Employee>();
        employees.Add(new Employee { Id = 1, Name = "Category 1" });
        employees.Add(new Employee { Id = 2, Name = "Category 2" });
        employees.Add(new Employee { Id = 3, Name = "Category 3" });
        return Json(employees, JsonRequestBehavior.AllowGet);
    }
    [HttpPost]
    public ActionResult InsertSelected(List<Employee> employees)
    {
        string result = "Success!";
        return Json(result, JsonRequestBehavior.AllowGet);
    }
    public class Employee
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }
}
View
@{
    Layout = null;
}
<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2020.1.114/styles/kendo.default-v2.min.css" />
    <script type="text/javascript" src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
    <script type="text/javascript" src="https://kendo.cdn.telerik.com/2020.1.114/js/angular.min.js"></script>
    <script type="text/javascript" src="https://kendo.cdn.telerik.com/2020.1.114/js/kendo.all.min.js"></script>
    <script type="text/javascript">
        var app = angular.module("MyApp", ["kendo.directives"]);
        app.controller("MyController", function ($scope, $window, $http) {
            $scope.mainGridOptions = {
                dataSource: { transport: { read: "/Home/GetAll/" }, pageSize: 5 },
                columns: [
                    { field: "Id", title: "Id" },
                    { field: "Name", title: "Name" },
                    {
                        template: function (dateItem) {
                            return dateItem.IsActive ?
                                "<input type='checkbox' class='k-checkbox row-checkbox' ng-click='CheckUnCheckHeader($event)' class='checkbox' ng-checked='" + dateItem.IsActive + "' />" :
                                "<input type='checkbox' class='k-checkbox row-checkbox' ng-click='CheckUnCheckHeader($event)' class='checkbox'/>";
                        },
                        headerTemplate: "<input id='checkAll' class='k-checkbox header-checkbox' ng-click='CheckUnCheckAllRow($event)'  type='checkbox' />"
                    }]
            };
            $scope.CheckUnCheckAllRow = function (event) {
                var isChecked = event.currentTarget.checked;
                $('.row-checkbox').each(function (index, item) {
                    if (isChecked) {
                        if (!$(item)[0].checked) {
                            $(item).click();
                        }
                    } else {
                        if ($(item)[0].checked) {
                            $(item).click();
                        }
                    }
                });
            };
            $scope.CheckUnCheckHeader = function (event) {
                var isChecked = event.currentTarget.checked;
                var allChecked = true;
                if (isChecked) {
                    $('.row-checkbox').each(function (index, item) {
                        if (!$(item)[0].checked) {
                            allChecked = false;
                        }
                    });
                } else {
                    allChecked = false;
                }
                var itemHeader = $('.header-checkbox');
                if (allChecked) {
                    if (!$(itemHeader)[0].checked) {
                        $(itemHeader).click();
                    }
                } else {
                    $(itemHeader).removeAttr("checked");
                }
            };
            $scope.Save = function () {
                var grid = $("#tblGrid").data("kendoGrid");
                var rows = [];
                for (var i = 0; i < grid.dataSource.data().length; i++) {
                    if ($("#tblGrid").data("kendoGrid").tbody.find('tr').eq(i).find('.k-checkbox').is(":checked")) {
                        var row = {};
                        row.Id = $(grid.dataSource.data()[i])[0].Id;
                        row.Name = $(grid.dataSource.data()[i])[0].Name;
                        rows.push(row);
                    }
                }
                $http({
                    method: "POST",
                    url: "/Home/InsertSelected",
                    dataType: 'json',
                    headers: { "Content-Type": "application/json" },
                    data: '{employees: ' + JSON.stringify(rows) + '}'
                }).then(function (response) {
                    $window.alert(response.data);
                });
            };
        })
    </script>
</head>
<body ng-app="MyApp" ng-controller="MyController">
    <kendo-grid options="mainGridOptions" id="tblGrid"></kendo-grid>
    <input type="button" name="name" value="Save" ng-click="Save()" />
</body>
</html>
Screenshot
