title: Initializing size of 2D array in runtime using C#
body: <p>I need to create a 2D array where size of column is fixed as 6 but size of row may vary . How to give dynamic row size in 2D array ? 
  Below is the code I tried but no luck.</p>
  
  <pre><code>int n;
  string num = console.ReadLine();
  Int32.TryParse(num,out n);
  int[,] ar = new int[n,6] ;
  </code></pre>