Answer Posted / rajender

private void btnCalculae_Click(object sender,
System.EventArgs e)
{
long number = Convert.ToInt64 (txtNumber.Text);
long factorial = 1;
lblFactorial.Text = factorial.ToString
("n20");

// calculate factorial

while ( number > 0 && number <= 20)
{
factorial *= number;
number++;
} // end while loop

txtNumber.Text = "";
txtNumber.Focus();
}

private void btnExit_Click(object sender,
System.EventArgs e)
{
this.Close();
}
}
}

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