title: How can you clear a bound property on a Razor Page's model when POSTing?
body: <p>I have a property that is bound to an input field:</p>
  
  <pre><code>&lt;input id="name" asp-for="ContactName" name="ContactName" placeholder="Name" type="text" style="width: 200px !important;" autofocus&gt;
  
  [BindProperty]
  public string ContactName { get; set; }
  </code></pre>
  
  <p>When I POST, I tried clearing the <code>ContactName</code> property by setting it to NULL or string.Empty, but it doesn't work.</p>
  
  <p>What's the proper way to clear out this field?</p>