update cellContent in HTML via vb.net

can you please help me to update cellContent in HTML via vb.net. It is Datagrid view in website. Below is inspect HTML:

<div class="grid-controls">
    <form method="post" class="vss-app-form grid-control-popover none" id="gridMorePopover_1346" name="gridMorePopover_1346" enctype="multipart/form-data" action="">
        <input type="hidden" id="sessionId-gridMorePopover_1346" search-phrase" 

I want to update here <div class="cellContent">B0025KV07A</div> this is inspect element.