Here i have created a sample of Ajax Tab Container
<form id="form1" runat="server">
<div>
<cc1:ToolkitScriptManager runat="server">
</cc1:ToolkitScriptManager>
<cc1:TabContainer ID="UserProfile" runat="server">
<cc1:TabPanel ID="tpnlEmail" runat="server" HeaderText="Signature & Bio">
<ContentTemplate>
<table border="0" cellpadding="0" cellspacing="2">
<tr>
<td>
Signature
</td>
<td>
<asp:TextBox ID="txtSignature" runat="server" />
</td>
</tr>
<tr>
<td>
Bio
</td>
<td>
<asp:TextBox ID="txtBio" runat="server" />
</td>
</tr>
<tr>
<td>
<asp:Button ID="btnSave" Text="Save" runat="server" />
</td>
<td>
</td>
</tr>
</table>
</ContentTemplate>
</cc1:TabPanel>
<cc1:TabPanel ID="tpnlAddress" runat="server" HeaderText="Enter Address">
<ContentTemplate>
<table border="0" cellpadding="0" cellspacing="2">
<tr>
<td>
Residential Address
</td>
<td>
<asp:TextBox ID="txtResidentialAddress" TextMode="MultiLine" runat="server" />
</td>
</tr>
<tr>
<td>
Zip Code
</td>
<td>
<asp:TextBox ID="txtZipCode" runat="server" />
</td>
<tr>
<td>
<asp:Button ID="btnSaveAddress" Text="Save and Continue" runat="server" />
</td>
</tr>
</tr>
</table>
</ContentTemplate>
</cc1:TabPanel>
</cc1:TabContainer>
</div>
</form>
In the above sample i have added two TabPanel but you can add as many TabPanel You want

Thank You.