title: Validation Message still show up when an autopostback dropdownlist fires
body: <p>I have a required field validator to validate a dropdownlist. this dropdownlist is an autopostback one, and it's causevalidation property is set to be false.</p>
  
  <p>the issue is, when I select the default item, the validation message shows, but the still do the postback. And after the postback, the message disappers.</p>
  
  <p>here is the snippet of codes:</p>
  
  <pre><code>&lt;asp:RequiredFieldValidator ID="ContactMethodRequired" runat="server" ControlToValidate="ContactPreferences"
              Display="Dynamic" ErrorMessage="Please choose your contact method"
              EnableClientScript="true" InitialValue=""&gt;&lt;/asp:RequiredFieldValidator&gt;
          &lt;div&gt;
              &lt;asp:DropDownList ID="ContactPreferences" runat="server" AutoPostBack="true" CausesValidation="false"&gt;
                  &lt;asp:ListItem Text="Select" Value="" Selected="True"&gt;&lt;/asp:ListItem&gt;                         
                  &lt;asp:ListItem Text="Email" Value="Email"&gt;&lt;/asp:ListItem&gt;
                  &lt;asp:ListItem Text="Phone" Value="Phone"&gt;&lt;/asp:ListItem&gt;
              &lt;/asp:DropDownList&gt;
          &lt;/div&gt;
  </code></pre>