public async Task <IHttpActionResult> DeleteGroup(int groupID, int requesterID)
        {
            var requester = await db.Users.FirstOrDefaultAsync(u => u.UserID == requesterID);

            if (requester == null)
            {
                return(NotFound());
            }

            var group = await db.Groups.FirstOrDefaultAsync(g => g.GroupID == groupID);

            if (group == null)
            {
                return(NotFound());
            }

            if (group.GroupType == GroupType.GROUP.ToString())
            {
                await db.DeleteAGroup(groupID, requesterID);
            }
            else
            {
                await db.DeleteAConversation(groupID, requesterID);
            }

            return(Ok());
        }