Error 1 Operator '*' cannot be applied to operands of type 'method group' and 'double'

Question

I believe what i am trying to do is very simple but I get the error. Operator \'*\' cannot be applied to operands of type \'method group\' and \'double\'

I want to mult

Answer 1

Do this:

private void button1_Click(object sender, EventArgs e)
{
    double rental;

    var dayRental = dayrental();

    if(checkBox1.Checked == true)
       rental = dayrental * 19.95;

    label4.Text = Convert.ToString(rental);  
}

private void label4_Click(object sender, EventArgs e)
{

}

public int dayrental()
{
     var timeSpan = dateTimePicker2.Value - dateTimePicker1.Value;

     var rentalDays = timeSpan.Days;                      

     return rentalDays;
}