title: Dropdownlist Issue in ASP.NET C#
body: <p>I have 2 tables:</p>
  
  <pre><code>table_section
  -------------
  section_id
  section_name
  
  table_class
  -----------
  class_id
  class_name
  section_id_f
  </code></pre>
  
  <p>I want to have 1 drop down list displaying both section_name and class_name as shown in the figure below.</p>
  
  <p><a href="https://i.stack.imgur.com/9MZkC.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9MZkC.jpg" alt="enter image description here"></a></p>