private void btnSignUp_Click(object sender, EventArgs e)
{
this.Hide();
frmSignUp frm = new frmSignUp();
frm.ShowDialog();
}
private void addButton_Click(object sender, EventArgs e)
{
var signUpScreen = new frmSignUp(userRepository, language, false);
signUpScreen.ShowDialog();
userRepository = signUpScreen.userRepository;
}