title: How to find source file of .net Built in functions like WriteLine()
body: <p>I'm trying to view the source code of some built in c# functions and trying to explore System.Console class etc..  I used ctrl+click by hovering over the built-in functions like ReadLine(). On using ctrl+click it redirects me to System.Console metadata page -&gt; where I could find <strong>only a declaration is available</strong></p>
  <pre><code>    // Summary:
      //     Writes the specified string value, followed by the current line terminator, to
      //     the standard output stream.
  public static void WriteLine(string value);
  </code></pre>
  <p>In the above case, the function is only declared <strong>but couldn't find any definition</strong>.  So, could someone please help with this?  Is there any way to find out the source code definitions of built-in c# functions?</p>