title: How to populate a textbox from the result of a query
body: <p>I have a combobox and a Textbox on my form.</p>
  
  <p>If a user chooses a value from the Combobox for example: <strong>Cvalue</strong> then I want to populate the textbox with the results of a query, for example :</p>
  
  <pre><code>Select S1 From Test where Name=Cvalue
  </code></pre>
  
  <p>How can I do that?</p>