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    copied!<p>You should do it using JavaScript.<br> Here an example I made, the trick is to use <code>ValidationGroup</code> and save the Old tab Index at the end of the function called by the <code>OnClientActiveTabChanged</code></p> <pre><code> &lt;AjaxControlToolkit:TabContainer ID="TabContainer1" runat="server" Height="138px" Width="402px" ActiveTabIndex="0" OnClientActiveTabChanged="ValidateTab" &gt; &lt;AjaxControlToolkit:TabPanel runat="server" ID="TabPanel1" HeaderText="TabPanel1" &gt; &lt;ContentTemplate&gt; &lt;asp:TextBox ID="TextBox1" runat="server"&gt;&lt;/asp:TextBox&gt; &lt;asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="RequiredFieldValidator" ControlToValidate="TextBox1" ValidationGroup="TabPanel1" /&gt; &lt;/ContentTemplate&gt; &lt;/AjaxControlToolkit:TabPanel&gt; &lt;AjaxControlToolkit:TabPanel runat="server" ID="TabPanel2" HeaderText="TabPanel2" &gt; &lt;ContentTemplate&gt; &lt;asp:TextBox ID="TextBox2" runat="server"&gt;&lt;/asp:TextBox&gt; &lt;asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="RequiredFieldValidator" ControlToValidate="TextBox2" ValidationGroup="TabPanel2" /&gt; &lt;/ContentTemplate&gt; &lt;/AjaxControlToolkit:TabPanel&gt; &lt;/AjaxControlToolkit:TabContainer&gt; &lt;script type="text/javascript"&gt; var OldtabIndex = 0; function ValidateTab(sender, args) { if (OldtabIndex == 0) { if (!Page_ClientValidate('TabPanel1')) { sender.set_activeTabIndex(OldtabIndex); } } else if (OldtabIndex == 1) { if (!Page_ClientValidate('TabPanel2')) { sender.set_activeTabIndex(OldtabIndex); } } OldtabIndex = sender.get_activeTabIndex(); } &lt;/Script&gt; </code></pre>
 

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