private void button2_Click(object sender, EventArgs e)
 {
     if (Kontrol.ULogin(emailText.Text, sifreText.Text))
     {
         UGAna uGAna = new UGAna();
         this.Hide();
         uGAna.Show();
     }
     else
     {
         label3.Visible = true;
     }
 }