Required field validator issue for multiple controls
<p>In my aspx page in a submission form i have following html.  </p>

<pre><code>&lt;p&gt;&lt;asp:CheckBox ID="chkWishToDonateFrmTrust " runat="server" onclick="chkWishToDonateFrmTrustHandle(this)"  /&gt;
Wish to donate from following Trust for future transactions&lt;/p&gt;&lt;p&gt;&amp;nbsp;&lt;/p&gt;&lt;p&gt;&lt;textarea name="textarea" cols="45" rows="5" class="txtTrustDetails" runat="server"
                                            id="txtTrustDetails" &gt;&lt;/textarea&gt;&lt;/p&gt;
</code></pre>

<p>I need to have a required field validation control to validate txtTrustDetails text area only if chkWishToDonateFrmTrust is checked by the user without server post backs for this.only javascript library I am using is Microsoft Ajax Framework.I also have to include this to validation group in form with some other for controls.I already know as my knowledge one required field validator control can only validate single UI control(<a href="http://forums.asp.net/t/1209510.aspx" rel="nofollow">asp.net forum thread</a>) does anyone in community dealt with this kind of issue in intuitive way?</p>
