public async Task <IActionResult> RemoveCourseFromGroup(string adminId, int groupId, int courseId) { AppUser user = await userManager.FindByIdAsync(adminId); if (user != null) { repository.RemoveCourseFromGroup(groupId, courseId); return(RedirectToAction("GroupDetails", new { id = adminId, groupId })); } else { return(RedirectToAction("UserNotFound", "Error")); } }