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Here is the Asp part:

<label for="chkCondition">
    <asp:CheckBox ID="chkCondition" Text="Should i show the div?" runat="server" onclick="ShowHideDiv(this)" />
</label>
<hr />
<div id="divToShowOrHide" style="display: none">
    this div will be shown regarding the checkbox checked status.
    <asp:TextBox ID="myTextBox" runat="server" />
</div>

And here is the Javascript part:

<script type="text/javascript">
    function ShowHideDiv(chkCondition) {
        var divToShowOrHide = document.getElementById("divToShowOrHide");
        divToShowOrHide.style.display = chkCondition.checked ? "block" : "none";
    }
</script>

In this way, you can also use Devexpress LoadingPanel functions for traditional asp.net components.