Multi Text Box subtraction

Question

private void contextBox_TextChanged(object sender, EventArgs e)

{

if (TotaltextBox.Text != "" && contextBox.Text != "" && RecivedtextBox.Text!="")

{

Decimal totalPricetopay = Convert.ToDecimal(TotaltextBox.Text) - Convert.ToDecimal(contextBox.Text);

Decimal total = Convert.ToDecimal(TotaltextBox.Text) - Convert.ToDecimal(RecivedtextBox.Text);

BalancetextBox.Text = totalPricetopay.ToString();

}

else

{

BalancetextBox.Text = "0";

}

}