public IActionResult AddManager(Manager manager)
 {
     try
     {
         _managerServices.AddManager(manager);
         return(CreatedAtAction("AddManager", manager));
     }
     catch (Exception)
     {
         return(BadRequest());
     }
 }
        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            var items = lstEmployee.Items.Where(i => ((CheckBox)i.FindControl("Checkbox")).Checked);

            foreach (ListViewItem item in items)
            {
                HiddenField     hid         = item.FindControl("HidId") as HiddenField;
                ManagerServices ascServices = new ManagerServices();
                ascServices.AddManager(Convert.ToInt32(hid.Value));
            }
            string prompt = "$.alert('Group Manager successfully added.');";

            this.Page.ClientScript.RegisterStartupScript(typeof(Page), "alert", prompt, true);

            //Response.Redirect("GroupManagers.aspx");
        }