DataAccessLayer.DataBase.CreateAdmin C# (CSharp) Method

        public void CreateAdmin(Account account)
        {         
            string queryString =
                "INSERT INTO accounts (accountid, login, name, mail, password, createdtime, country, city, photo, mimetype) " +
                "VALUES (@accountid, @login, @name, @mail, @password, @createdtime, @country, @city, @photo, @mimetype); " +
                "INSERT INTO UsersRoles (id, RoleId, accountid) " +
                "VALUES(@id, @RoleId, @accountid)";

            using (SqlConnection connection = new SqlConnection(_connectionString))
            {
                var command = new SqlCommand(queryString, connection);
                command.Parameters.AddWithValue("accountid", account.Id);
                command.Parameters.AddWithValue("login", account.Login);
                command.Parameters.AddWithValue("name", account.Login);
                command.Parameters.AddWithValue("mail", account.Email);
                command.Parameters.AddWithValue("password", account.Password);
                command.Parameters.AddWithValue("createdtime", account.CreatedTime);
                command.Parameters.AddWithValue("id", Guid.NewGuid());
                command.Parameters.AddWithValue("RoleId", 3);
                command.Parameters.AddWithValue("country", account.Country);
                command.Parameters.AddWithValue("city", account.City);
                command.Parameters.AddWithValue("photo", account.Avatar);
                command.Parameters.AddWithValue("mimetype", account.MimeType);

                try
                {
                    connection.Open();
                    command.ExecuteNonQuery();
                }
                catch (Exception)
                {
                    throw;
                }
            }
        }