title: Count checked CheckedListBox items
body: <p>I have CheckedListBox and four item in it!
  Now I want to count number of checked item. 
  For this I use:</p>
  
  <pre><code> countnumber=CheckedListBox1.CheckedItems.Count
  </code></pre>
  
  <p>But countnumber is always 0 even if I checked CheckedListBox items or not!</p>
  
  <p>What I am doing wrong?</p>