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    <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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    1. POAJAX ToolKit TabContainer: Can I capture the "Active Tab Panel Changing" event
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    1. USDavRob60
    1. USDavRob60
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    1. COThank you .. But what I need is to validate the contents before allowing the user to activate another tabpanel.
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      1. USAkram Shahda
    2. CO@Akram Try it, it's exactly what it's doing.
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      1. USDavRob60
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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