How to add commas to factorial loop

[johnkelly11]

hi

could someone help me to format this factorial with commas, to final answer in this factorial loop?

private void btnCalculate_Click(object sender, EventArgs e)
        {
            {
                decimal number = Convert.ToDecimal(txtNumber.Text);
                decimal factotorial = 1;


                for (int i = 1; i <= number; i++)
                {
                    factotorial *= i;

                }

                txtFactorial.Text = factotorial.ToString();


            }

        }

thanks

[johnkelly11]

nevermind i got the answer,change

txtFactorial.Te xt = factotorial.ToS tring();

to


txtFactorial.Te xt = factotorial.ToS tring("n0");