title: Put a Session variable into a textbox
body: <p>I have a Session variable </p>
  
  <pre><code>Session["customerID"]
  </code></pre>
  
  <p>I want to place this inside a textbox. How would I do this?</p>
  
  <p>I have tried </p>
  
  <pre><code>TextBox1.Text = Session ["customerID"]
  </code></pre>