Access jquery tab controls in code behind

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C#

ASP.NET

jQuery

I am using jquery tab control in my web application, I am displaying aspx pages inside tabs, I have a single button to save values which are entered in these asp pages controls.
This is my tab control with save button

<div id="tabs">
        <ul>
            <li><a href="Test1.aspx"><span>Test</span></a></li>
            <li><a href="Test2.aspx">Second</a></li>
            <li><a href="#tabs-3">Third</a></li>
        </ul>
    </div>
    <div>
        <asp:Button ID="btntest" runat="server" OnClick="btntest_Click" Text="Submit" />
    </div>

and this is my Test1.aspx

<form id="form1" runat="server">
        <table>
            <tr>
                <td>Firstname:</td>
                <td>
                    <asp:TextBox ID="txtname" runat="server"></asp:TextBox></td>
            </tr>
            <tr>
                <td>Lastname:</td>
                <td>
                    <asp:TextBox ID="txtlname" runat="server"></asp:TextBox></td>
            </tr>
        </table>
    </form>

Test2.aspx

<form id="form1" runat="server">
       <table>
           <tr>
               <td>Age:</td>
               <td>
                   <asp:TextBox ID="txtage" runat="server"></asp:TextBox></td>
           </tr>
           <tr>
               <td>Occupation:</td>
               <td>
                   <asp:TextBox ID="txtoccup" runat="server"></asp:TextBox></td>
           </tr>
       </table>
   </form>

Now I want to save the values which are entered in Firstname, lastname, age and occupation fields. How can I access these controls in btntest_Click?
I want functionality that if on any tab,user click save button,it will save the respected form data.
Or is there any other solution/control for this?

What I have tried:

I have tried using jquery tab control, Also I have tried asp.net multi-view but in multi-view I cant display web pages in side View.