I set checkbox.checked in the beginning as true, and it remains true even if I uncheck it

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I have 6 checkboxes in HTML page. I set them to Checked = true if some condition exists:

C#

if (isMammals)
    mammals.Checked = true;
if (isBirds)
    birds.Checked = true;
if (isReptiles)
    reptiles.Checked = true;
if (isAmphibians)
    amphibians.Checked = true;
if (isFishes)
    fishes.Checked = true;
if (isInvertebrates)
    invertebrates.Checked = true;

But even when the user unchecks the checkbox Checked remains true:

C#

isMammals = mammals.Checked;
isBirds = birds.Checked;
isReptiles = reptiles.Checked;
isAmphibians = amphibians.Checked;
isFishes = fishes.Checked;
isInvertebrates = invertebrates.Checked;

What I have tried:

The value of this variables remains true. How can I fix it?
Thanks

Posted 22-Apr-23 6:20am

Mike Radunski

Updated 22-Apr-23 8:26am

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OriginalGriff · Answer 1 · 2023-04-22T08:26:00

From just that scrap of code, we can't tell - but at a guess it's because of how web pages work: are you checking to see if this is a postback in your page load event handler? Because if you aren't, then when the user checks his boxes and clicks "ENTER", the load event will fire again and set the check boxes - then the Click event will fire and you have lost the user set states.

Page.IsPostBack Property (System.Web.UI) | Microsoft Learn[^]