private void btn_sign_Click(object sender, EventArgs e)
{
Frm_sign sign = new Frm_sign(this);
sign.Show();
this.Hide();
}
private void btn_logined_Click(object sender, EventArgs e)
{
if (txt_name.Text != "" && txt_surname.Text != "" && txt_mail.Text != "" && txt_password.Text != "")
{
MessageBox.Show("You are succesfull register");
Frm_sign sign = new Frm_sign(this.form1);
sign.Show();
this.Hide();
}
else
{
MessageBox.Show("Do not leave it blank");
}
}