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.