private void subButton_Click(object sender, EventArgs e)
{
bool flag1 = Regex.IsMatch(number1TextBox.Text, "[0-9.]{1,}$");
bool flag2 = Regex.IsMatch(number2TextBox.Text, "[0-9.]{1,}$");
if (flag1 == true && flag2 == true)
{
double num1 = Convert.ToDouble(number1TextBox.Text);
double num2 = Convert.ToDouble(number2TextBox.Text);
resultTextBox.Text = Convert.ToString(calculator.Sub(num1, num2));
}
else
{
MessageBox.Show("Enter all TextField properly.");
}
}
private void subtractionButton_Click(object sender, EventArgs e)
{
resultTextBox.Text = aCalculator.Sub(Convert.ToDouble(firstNumberTextBox.Text), Convert.ToDouble(secondNumberTextBox.Text)).ToString();
}
