private void btnUrunSat_Click(object sender, EventArgs e)
{
if (Application.OpenForms["urunSatis"] == null)
{
urunsatis = new urunSatis();
urunsatis.Show();
}
else
{
urunsatis.Activate();
}
}
private void button3_Click(object sender, EventArgs e)
{
urunSatis sat = new urunSatis();
sat.Show();
}