Accessing server control from accordion panel

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ASP.NET

Hi
I have created dynamic accordion panel and added dynamic control, but not able to find control while saving records, any comments or valuable remark would be appreciated.

Below is my code

</div><a id="NavigationMenu_SkipLink"></a>
            </div>
        </div>
        <div class="main">

    <style>
        .accordionHeader
        {
            border: 1px solid #2F4F4F;
            color: white;
            background-color: #2E4d7B;
            font-family: Arial, Sans-Serif;
            font-size: 12px;
            font-weight: bold;
            padding: 5px;
            margin-top: 5px;
            cursor: pointer;
        }

        .accordionContent
        {
            background-color: #D3DEEF;
            border: 1px dashed #2F4F4F;
            border-top: none;
            padding: 5px;
            padding-top: 10px;
        }
    </style>
    <script type="text/javascript">
//<![CDATA[
Sys.WebForms.PageRequestManager._initialize('ctl00$MainContent$ScriptManager1', 'ctl01', [], [], [], 90, 'ctl00');
//]]>
</script>

    <div id="MainContent_acc1" style="height:16px;margin-top: 12px;
        margin-bottom: 0px">
    <input type="hidden" name="ctl00$MainContent$acc1_AccordionExtender_ClientState" id="MainContent_acc1_AccordionExtender_ClientState" value="0" /><div id="MainContent" class="accordionHeader">
        Demography Details
    </div><div id="MainContent" class="accordionContent" style="display:block;">
        <tr style="border-color:Black;border-width:2px;border-style:solid;">
            <td valign="top" style="border-width:2px;border-style:solid;">Weight</td><td valign="top" style="border-width:2px;border-style:solid;"><input name="ctl00$MainContent$b5bc04fc_a538_458a_bc0b_06b0b6a25966_content$b5bc04fc_a538_458a_bc0b_06b0b6a25966" type="text" maxlength="12" id="MainContent_b5bc04fc_a538_458a_bc0b_06b0b6a25966" /></td>
        </tr><br /><tr style="border-color:Black;border-width:2px;border-style:solid;">
            <td valign="top" style="border-width:2px;border-style:solid;">Height</td><td valign="top" style="border-width:2px;border-style:solid;"><input name="ctl00$MainContent$b5bc04fc_a538_458a_bc0b_06b0b6a25966_content$9609cdb9_4203_4990_8a3c_f7ef50cf4e56" type="text" maxlength="4" id="MainContent_9609cdb9_4203_4990_8a3c_f7ef50cf4e56" /></td>
        </tr><br />
    </div><div id="MainContent" class="accordionHeader">
        Medical History
    </div><div id="MainContent" class="accordionContent" style="display:none;">
        <tr style="border-color:Black;border-width:2px;border-style:solid;">
            <td valign="top" style="border-width:2px;border-style:solid;">Age</td><td valign="top" style="border-width:2px;border-style:solid;"><input name="ctl00$MainContent$21fe9ea2_3b65_45e0_bdb0_d6978e60e74c_content$21fe9ea2_3b65_45e0_bdb0_d6978e60e74c" type="text" maxlength="12" id="MainContent_21fe9ea2_3b65_45e0_bdb0_d6978e60e74c" /></td>
        </tr><br />
    </div>
</div>

    <p>
        <table id="MainContent_CustomUITable">

</table>
    </p>

    <p>
        <input type="submit" name="ctl00$MainContent$UpdateButton" value="Update" id="MainContent_UpdateButton" />
        &nbsp;&nbsp;&nbsp;
        <input type="submit" name="ctl00$MainContent$CancelButton" value="Cancel" id="MainContent_CancelButton" />
    </p>

            `</div>
        <div class="clear">
        </div>
    </div>
    <div class="footer">

    </div>

Thanks in advance