Format Decimal value to string prefixed by a minus sign
<p>How do I convert a decimal value to a string of decimal digits (0-9), prefixed by a minus sign?</p>

<p>Decimal paymentAmt = -871.00M;</p>

<p>I need it formatted to: -000000871.00</p>

<p>The format parameter can be any valid standard numeric format specifier except for D, R, and X, as well as any combination of custom numeric format specifiers. </p>
