private void btnAdd_Click(object sender, EventArgs e)
        {
            User oUser = new User();

            oUser.sUserFirstName = inptNewUserName.Text;
            oUser.sUserLastName  = inptNewUserSurname.Text;
            oUser.sUserName      = inptNewUserUsername.Text;
            oUser.sUserPassword  = inptNewUserPassword.Text;
            Crud Crud = new Crud();

            Crud.AddNewUser(oUser);

            this.FormUserList.DataGridViewUsers.DataSource = Crud.GetUsers();
            this.Hide();
        }