private void radioButton1_CheckedChanged(object sender, EventArgs e)
{
double votuz = (Convert.ToInt32(textBox1.Text) * 30 / 100);
textBox1.Text = votuz.ToString();
}

private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
double vkirk = (Convert.ToInt32(textBox1.Text) * 40 / 100);
textBox1.Text = vkirk.ToString();
}
private void radioButton3_CheckedChanged(object sender, EventArgs e)
{
double velli = (Convert.ToInt32(textBox1.Text) * 50 / 100);
textBox1.Text = velli.ToString();
gizle();
}
private void radioButton4_CheckedChanged(object sender, EventArgs e)
{
double felli = (Convert.ToInt32(textBox2.Text) * 50 / 100);
textBox2.Text = felli.ToString();
gizle();
}
private void radioButton5_CheckedChanged(object sender, EventArgs e)
{
double faltmis = (Convert.ToInt32(textBox2.Text) * 60 / 100);
textBox2.Text = faltmis.ToString();
}

private void radioButton6_CheckedChanged(object sender, EventArgs e)
{
double fyetmis = (Convert.ToInt32(textBox2.Text) * 70 / 100);
textBox2.Text = fyetmis.ToString();
}

private void radioButton7_CheckedChanged(object sender, EventArgs e)
{
double oon = (Convert.ToInt32(textBox3.Text) * 10 / 100);
textBox3.Text = oon.ToString();
}

private void radioButton8_CheckedChanged(object sender, EventArgs e)
{
double oyirmi = (Convert.ToInt32(textBox3.Text) * 20 / 100);
textBox3.Text = oyirmi.ToString();
}



private void gizle()
{
foreach (Control item in panel1.Controls)
{
if (item is RadioButton)
{
RadioButton rb = item as RadioButton;
if (item != radioButton3 && item != radioButton4 && item != radioButton7 && item != radioButton8)
{
rb.Enabled = false;
}
}
}
}
private void button1_Click(object sender, EventArgs e)
{
int toplamnot = Convert.ToInt32(textBox1.Text) + Convert.ToInt32(textBox2.Text) + Convert.ToInt32(textBox3.Text);
if (!checkBox1.Checked)
{
textBox4.Text = toplamnot.ToString();
}
else
{
textBox4.Text = (toplamnot + 10).ToString();
}

}


//al buda benden, eksikleri varsa yazarsın yine, ilk 6 radiobuttonu panelin icine almayi ihmal etme