title: Create a List of existing Buttons
body: <p>l've 10  ten button on my forms ( 0 to 9) to simulate a calculator
      All my buttons are named like this <code>btnCalc0</code>,<code>btnCalc1</code>,<code>btnCalc2</code>,etc...</p>
  
  <p>I want to create an array or list of these buttons to handle event but it's doesn't work because <code>btnCalc</code> doesnt exist<code>(btnCalc+x)</code>.</p>
  
  <pre><code>List&lt;Button&gt; lstBtnCalc = new List&lt;Button&gt;();
  for (int x = 0; x &lt; 10; x++)
  {
    lstBtnCalc.Add(btnCalc+x)); 
  }
  
  private void myClick(object sender, EventArgs e)
  {
      int index = lstBtnCalc.IndexOf(sender as Button);
  }
  </code></pre>