private void button6_Click(object sender, EventArgs e)
        {
            giris girisac = new giris();

            girisac.Show();
            this.Close();
        }
 private void button14_Click(object sender, EventArgs e)
 {
     if (stokkontrolyetki == 1)
     {
         yonetici yoneticiac = new yonetici();
         yoneticiac.Show();
         this.Close();
     }
     if (stokkontrolyetki == 3)
     {
         giris girisac = new giris();
         girisac.Show();
         this.Close();
     }
 }