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Speedup CheckBoxList search

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Join Date: Aug 2006

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Reputation: Ramy Mahrous is just really nice

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Ramy Mahrous Ramy Mahrous is offline

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Speedup CheckBoxList search

Feb 16th, 2009

I want to speed ChechBoxList's getting the selected items, the normal approach is

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foreach (ListItem li in checkListBox.Items)
{
if (li.Selected)
{
}
}
foreach (ListItem li in checkListBox.Items)
{
if (li.Selected)
{
}
}

but if I've 6000 items in the CheckListBox, that's mean I should go through the 6000 items to know which is selected. Performance POOOOOOR!!!
Is there way to get just selected ItemsCollection ??

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Technical blog | http://ramymahrous.wordpress.com
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Join Date: Jan 2009

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Reputation: almostbob has a spectacular aura about

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almostbob

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Re: Speedup CheckBoxList search

Feb 16th, 2009

That was abount the most stupid post I have sent

I think I will edit it out
wish there was a delete button

Last edited by almostbob; Feb 16th, 2009 at 10:28 am.

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Reputation: Aneesh_Argent is an unknown quantity at this point

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Aneesh_Argent Aneesh_Argent is offline

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Re: Speedup CheckBoxList search

Feb 17th, 2009

I dont think there is a built in method to get selected ItemsCollection only. Even if there is one, the algorithm would be the same as yours. So it wont solve the performance issue. One way to do this will be to use a javascript function to append the indices of only the selectedItem to a hiddenfield on its onClientClick event and then to parse the hidden field value in your code behind to get the Selected item indices.
If you get another good reliable way of doing it please post it here so that everyone can learn
Thanks

Last edited by Aneesh_Argent; Feb 17th, 2009 at 1:05 am.