public void AddUsertoGroup(string username, string groupname)
 {
     try
     {
         var addUserToGroup = new AdminAddUserToGroupRequest {
             GroupName = groupname, Username = username, UserPoolId = _poolId
         };
         _client.AdminAddUserToGroup(new AdminAddUserToGroupRequest());
     }
     catch (Exception e)
     {
         Console.WriteLine(e);
         throw;
     }
 }