title: toFixed function in c#
body: <p>in Javascript, the toFixed() method formats a number to use a specified number of trailing decimals.
  <a href="http://www.w3schools.com/jsref/jsref_tofixed.asp" rel="noreferrer">Here is toFixed method in javascript</a></p>
  
  <p>How can i write a same method in c#?</p>