How to remove an item from a listbox?

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I am trying to remove and time from a listbox but I am getting this error

Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/>

I have tried

enableEventValidation="false"

but the page is not working the way it should.

The ListBox is getting populated from a Gridview. But I think the list gets

updated everytime I click a button on the page.

thanks for you response.

What I have tried:

int a = LBDuties.SelectedIndex;
                LBDuties.Items.RemoveAt(a);
               // LBDuties.Items.Remove(LBDuties.SelectedValue);
              //  LBDuties.SelectedIndex = 1;

Posted 5-Jul-17 6:17am

Member 9331278

Updated 6-Jul-17 1:20am

v2

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j snooze 5-Jul-17 17:41pm

Are you checking for if(!Page.IsPostback) ?? If you are filling the drop down everytime the page posts back you may get this. If you have the listbox filling in only on initial page entry you should be ok. Check that out.

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Atlapure Ambrish · Answer 1 · 2017-07-05T20:19:00

Solution 1

More details would help to understand the problem better. From your explanation it is not clear when and where (code part) the exception is occurring. If you want to prevent postback for a specific control, where postback is not necessary, set AutoPostBack property to 'false'.

Posted 5-Jul-17 20:19pm

Atlapure Ambrish

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Member 9331278 7-Jul-17 11:40am

I realized that is does not have to do with removing items in the list box
but when the gets postback

Khaja Moiz · Answer 2 · 2017-07-06T01:20:00

List<string> temp = new List<string>();

    foreach (string item in listBox1.Items)
    {
        string removelistitem = "RemoveValue";
        if(item.Contains(removelistitem))
        {
            ArraySample.Items.Add(item);
         }
     }

    foreach(string item in ArraySample)
    {
       listBox1.Items.Remove(item);
    }