private void button2_Click(object sender, EventArgs e)
        {
            WebPortal form = new WebPortal();

            form.Show();
            this.Close();
        }
 private void button1_Click(object sender, EventArgs e)
 {
     if (textBox4.Text == textBox2.Text && textBox3.Text != "" && textBox1.Text != "" && textBox5.Text != "" && textBox2.Text != "")
     {
         TextWriter writes1 = new StreamWriter("list_of_users.txt", true);
         writes1.WriteLine(textBox3.Text + "   " + textBox1.Text + "   " + textBox5.Text + "   " + textBox2.Text);
         writes1.Close();
         WebPortal form = new WebPortal();
         form.Show();
         this.Close();
     }
     else
     {
         MessageBox.Show("Something went wrong check if you filled the boxes and if your passwords match");
     }
 }
        private void pictureBox2_Click(object sender, EventArgs e)
        {
            string res = System.IO.File.ReadAllText("hasres.txt");

            if (res.Equals("yes"))
            {
                reserved = true;
            }

            if (reserved)
            {
                MessageBox.Show("Έχετε ήδη πραγματοποιήσει κράτηση. \nΠροχωρήστε στο ταμείο ώστε \nνα παραλάβετε τα εισητήριά σας!");
            }
            else
            {
                WebPortal form = new WebPortal();
                form.Show();
            }
        }