public async Task <ActionResult> DeleteUserGroupMembership(UserGroupMembershipViewModel model)
{
if (string.IsNullOrEmpty(model.UserGroupId) || string.IsNullOrEmpty(model.UserId))
{
return(BadRequest());
}
await _userGroupManager.DeleteUserGroupMembershipAsync(model.UserGroupId, model.UserId);
return(Ok(model));
}