http://forums.asp.net/69.aspxDiscuss your favorite ASP.NET components here. <a href="http://aspadvice.com/SignUp/list.aspx?l=70&c=16" target="_blank">Email List</a>enCommunityServer 2007 SP1 (Build: 20510.895)http://forums.asp.net/thread/3267649.aspxWed, 01 Jul 2009 00:03:42 GMT4c671506-2930-414c-a40b-8bf57ded5924:3267649MetalAsp.NetMetalAsp.Net0http://forums.asp.net/thread/3267649.aspxhttp://forums.asp.net/commentrss.aspx?SectionID=69&PostID=3267649<p>Use a RequiredFieldValidator for the date control, and set it Enabled=&quot;False&quot;.&nbsp; Now handle the SelectedIndexChanged event of the DDL, and if the selectedvalue is 2, enable the validator, otherwise disable it.</p>http://forums.asp.net/thread/3267416.aspxTue, 30 Jun 2009 20:19:45 GMT4c671506-2930-414c-a40b-8bf57ded5924:3267416commadercodycommadercody0http://forums.asp.net/thread/3267416.aspxhttp://forums.asp.net/commentrss.aspx?SectionID=69&PostID=3267416<p></p><pre class="c-sharp" name="code">If a user selects &quot;Evening&quot; then the RadDate1 is required. What is the best way to go about this? </pre><pre class="c-sharp" name="code"><pre class="c-sharp" name="code">&lt;asp:DropDownList ID=&quot;DropDownListTime&quot; AutoPostBack=&quot;true&quot; runat=&quot;server&quot;&gt; &lt;asp:ListItem Text=&quot;Not Set&quot; Value=&quot;0&quot; /&gt; &lt;asp:ListItem Text=&quot;Morning&quot; Value=&quot;1&quot; /&gt; &lt;asp:ListItem Text=&quot;Evening&quot; Value=&quot;2&quot; /&gt; &lt;/asp:DropDownList&gt; </pre><pre class="c-sharp" name="code">&nbsp;</pre><pre class="c-sharp" name="code">&lt;telerik:RadDatePicker ID=&quot;RadDate1&quot; runat=&quot;server&quot; &gt; &lt;DateInput ID=&quot;DateInput1&quot; Font-Size=&quot;8pt&quot; runat=&quot;server&quot; /&gt; &lt;/telerik:RadDatePicker&gt; </pre><br /><br />&nbsp;</pre>