title: FormatException in Convert.ToInt32
body: <p>I am currently using a method to toggle a menu in my console which returns a <code>Convert.ToInt32(Console.ReadLine());</code></p>
  
  <p>When a string is in-putted on debug, it gives me this error: <code>An unhandled exception of type 'System.FormatException' occurred in mscorlib.dll</code></p>
  
  <p>I have tried researching this error on MSDN but cannot work out how to add a format to it. Could someone please maybe give me a link to a simple fix? Thank-you.</p>