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namespace _1secimkutusu
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void label2_Click(object sender, EventArgs e)
{

}

private void label4_Click(object sender, EventArgs e)
{

}

private void Form1_Load(object sender, EventArgs e)
{
//txtbx3 ve lbl3ü etkisizleştirelim
label3.Enabled = false;
textBox3.Enabled = false;
//txtbx3 ve lbl3ü gizleyelim
label3.Visible = false;
textBox3.Visible = false;
}

private void checkBox1_CheckedChanged(object sender, EventArgs e)
{//seçim kutusunun seçimi değişti
// seçildi mi ? seçimden çıkarıldı mı ?
if (checkBox1.Checked)
{//seçilmiş, lbl3 ve txtbx3 ü görelim, etkinleştirelim
label3.Enabled = true;
label3.Visible = true;
textBox3.Enabled = true;
textBox3.Visible = true;
}
else
{//seçimden çıkarılmış, lbl3 ve txtbx3 ü gizleyelim
label3.Enabled = false;
label3.Visible = false;
textBox3.Enabled = false;
textBox3.Visible = false;
}
}

private void button1_Click(object sender, EventArgs e)
{
double fiyat, satisfiyati, kdv, indirim, tutar;
fiyat = satisfiyati = kdv = indirim = tutar = 0;
try
{
fiyat = double.Parse(textBox1.Text);
kdv = double.Parse(textBox2.Text);
//öğrenci indirim kutusu seçili ise txtbx3ü double'a hecele
if (checkBox1.Checked)
{
indirim = double.Parse(textBox3.Text);
}

}
catch (Exception istisna)
{

MessageBox.Show(istisna.Message, istisna.Source);
}
satisfiyati = fiyat + fiyat * kdv / 100.0;
tutar = satisfiyati - satisfiyati * indirim / 100.0;
label4.Text=tutar.ToString();
}

private void checkBox2_CheckedChanged(object sender, EventArgs e)
{//chkbx2 seçildiğinde kurulum butonu etkinleşsin
/*
if (checkBox2.Checked)
{//eğer seçildi ise
button2.Enabled = true;
}
else
{//eğer seçimden çıkarılı ise
button2.Enabled = false;
}
*/
button2.Enabled = checkBox2.Checked;

}
}
}
     
 
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