title: 2d Array in C# with random numbers
body: <p>I want to create 2d array in C#. size: 3 on 5, and insert into random numbers.
  I try that but it's not work:</p>
  
  <pre><code>Random rnd = new Random();
              int[][] lala = new int[3][5];
              for(int i=0;i&lt;3;i++)
                  for(int j=0;j&lt;4;j++)
                      lala[i][j]= rnd.Next(1, 10);
  </code></pre>
  
  <p>get an error: 'invalid rank specifier expected ',' or ]'</p>
  
  <p>what is the problem?</p>
  
  <p>thanks</p>