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Asked: 2026-05-24T08:34:23+00:00

If I set some control’s property Visible=false, I cant see the control in the

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If I set some control’s property Visible=”false”, I cant see the control in the HTML generated of my aspx page. But when I use display:none in style tag for that control, I see the control as greyed out in the HTML. Why is that?

Also, If I find some control that is not needed on the page anymore:-

  1. should I comment it out from my page?
  2. Should I set its property Visible=false”
  3. Should I set display:none?

What would be the best approach keeping in mind the time constraint and page’s heaviness?

Below is the HTML that was generated of my test page:-

<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> </title>
</head>
<body>
<form id="form1" action="testvisibility.aspx" method="post" name="form1">
<div>
<input id="__VIEWSTATE" type="hidden" value="/wEPDwUKMTY2NDk3NDQzNQ9kFgICAw9kFgQCBw8PFgIeB1Zpc2libGVoZGQCCQ8WAh4Fc3R5bGUFDWRpc3BsYXk6bm9uZTtkZEjYzMWMovvrGmuSrQHwc5ZXgqXCrf+lekz1GgsdjUd+" name="__VIEWSTATE">
</div>
<div>
visiblelabel::
<span id="visiblelabel">visiblelabel</span>
<br>
labelwithvisiblefalseonaspx::
<br>
labelwithdisplaynoneonaspx::
<div style="display: none;">
<span id="labelwithdisplaynoneonaspx">labelwithdisplaynoneonaspx</span>
</div>
<br>
labelwithvisiblefalseonserverside::
<br>
labelwithdisplaynoneonserverside::
<div id="divforlabelwithdisplaynoneonserverside" style="display: none;">
<span id="labelwithdisplaynoneonserverside">labelwithdisplaynoneonserverside</span>
</div>
<br>
</div>
</form>
</body>
</html>
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1 Answer

  1. Editorial Team

    If you want to dynamically show or hide the control via Ajax/etc, or if the control contains information your page needs, set display:none in CSS.

    If you don’t want to render the control at all in certain situations, set Visible="false". Since it keeps the control’s HTML out of the page, it makes for slightly smaller pages — but if you want to show the control via Ajax/etc, this won’t work.

    If you don’t want to render the control at all, period, don’t comment it out — remove it altogether. All controls, visible or not, still require processing, so Visible=false is wasting CPU (and possibly causing side effects) if you never intend to render the control. And you really don’t want lots of commented-out stuff floating around; it just makes maintenance harder. You can always get it back from your revision control if you find you do need it later. (You are using SVN/Git/CVS/something, right?)

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