title: Remove item from ComboBox (DropDownList) Winforms
body: <p>I have a dropdownlist which has been populated</p>
  
  <pre><code>ddlNumbers.DisplayMember = "PhoneNumber";
  ddlNumbers.DataSource = mobileList;
  ddlNumbers.SelectedItem = null;
  </code></pre>
  
  <p>When a button is clicked I want to remove an item from it.</p>
  
  <pre><code>ddlMobileNumbers.Items.RemoveAt(i);
  </code></pre>
  
  <p>But get the exception. <em>'Items collection cannot be modified when the DataSource property is set...'</em></p>
  
  <p>I have also tried re-assigning a collection to the <code>DataSource</code> </p>
  
  <pre><code>ddlNumbers.DataSource = myNewList
  </code></pre>
  
  <p>But does not work.</p>
  
  <p>What am I doing wrong here?</p>