public async Task <ActionResult> CreateDepartment(Department department)
        {
            if (ModelState.IsValid)
            {
                if (!string.IsNullOrEmpty(department.Name))
                {
                    var depart = await InstitutionManager.FindDepartmentByNameAsync(department.Name);

                    if (depart == null)
                    {
                        await InstitutionManager.AddDepartmentAsync(department.Name);

                        return(RedirectToAction("AllDepartment"));
                    }
                    else
                    {
                        ModelState.AddModelError("", "已有相同名称");
                    }
                }
                else
                {
                    ModelState.AddModelError("", "不能为空");
                }
            }
            return(View(department));
        }