private:system:：void按钮1\u单击（system:：object^sender，system:：eventargs^e）

float price = Convert::ToDouble(textBox2->Text);
float downpay = Convert::ToDouble(textBox3->Text);
float interestrate = Convert::ToDouble(textBox4->Text);
float yearofpay = Convert::ToDouble(comboBox1->Text);
double Total;

Total = ((price - downpay) + (interestrate / 100 * (price - downpay) * yearofpay)) / (yearofpay * 12);
label7->Text = Total.ToString("F2");

}