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();
}