Remove selected Items from Asp.net ListBox

Question

I need to remove the selected items from a ListBox in asp.net. I keep finding examples for windows forms but not for asp.net.

I have a button click event that copies all items from one listbox to another. I want to be able to select individual items from the second listbox and click a button to remove them.

protected void btnAddAllProjects_Click(object sender, EventArgs e)
{

    foreach (ListItem item in lstbxFromUserProjects.Items)
    {
        lstBoxToUserProjects.Items.Add(item.ToString());
    }


}

    protected void btnRemoveSelected_Click(object sender, EventArgs e)
    {}

How is your data bound to the ListBox? Do you have a List bounded to the list? Please post some code — Agustin Meriles
– Agustin Meriles, Commented Feb 23, 2012 at 17:10

WraithNath · Accepted Answer · 2012-02-23 17:10:33Z

17

If you just want to clear the selected items then use the code below:

        ListBox1.ClearSelection();

        //or

        foreach (ListItem listItem in ListBox1.Items)
        {
            listItem.Selected = false;
        }

If you mean to what to actually remove the items, then this is the code for you..

        List<ListItem> itemsToRemove = new List<ListItem>();

        foreach (ListItem listItem in ListBox1.Items)
        {
            if (listItem.Selected)
                itemsToRemove.Add(listItem);
        }

        foreach (ListItem listItem in itemsToRemove)
        {
            ListBox1.Items.Remove(listItem);
        }

answered Feb 23, 2012 at 17:10

WraithNath

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7 Comments

Matt T Over a year ago

I think he's asking how to remove the selected items, not how to remove the highlight.

WraithNath Over a year ago

@MattT - Yeah just thought that! was updating my answer :) thanks

Ronald McDonald Over a year ago

I get this Error 1 'System.Web.UI.WebControls.ListBox' does not contain a definition for 'Selected' and no extension method 'Selected' accepting a first argument of type 'System.Web.UI.WebControls.ListBox' could be found (are you missing a using directive or an assembly reference?)

WraithNath Over a year ago

@RonaldMcDonald Can you post your code? It sounds like you are looking for a 'Selected' property on the ListBox, rather than the List Item...

Matt T Over a year ago

We could probably optimize the code to this, but I don't have my IDE handy to double check. foreach(ListItem listItem in ListBox1.SelectedItems) { ListBox1.Items.Remove(listItem); }

|

Meet Varasada · Accepted Answer · 2016-09-27 18:05:04Z

1

Try this to remove selected items from list box.

 protected void Remove_Click(object sender, EventArgs e)
{
    while (ListBox.GetSelectedIndices().Length > 0)
    {
        ListBox.Items.Remove(ListBox.SelectedItem); 
    }
}

edited Sep 27, 2016 at 18:05

answered Sep 27, 2016 at 17:38

Meet Varasada

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Comments

bigtech · Accepted Answer · 2013-03-12 17:37:59Z

0

I tried some experiments and the technique below works. It's not very efficient, in that it requeries the listbox on each iteration, but it gets the job done.

        while (myListBox.SelectedIndex != -1)
        {
            ListItem mySelectedItem = (from ListItem li in myListBox.Items where li.Selected == true select li).First();
            myListBox.Items.Remove(mySelectedItem);
        };

answered Mar 12, 2013 at 17:37

bigtech

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Comments

BenW · Accepted Answer · 2016-01-13 03:10:20Z

0

Why not simply use the Items.Remove and pass the selected item string value.

ListBox1.Items.Remove(ListBox1.SelectedItem.ToString());

answered Jan 13, 2016 at 3:10

BenW

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1 Comment

182764125216 Over a year ago

there could be multiple selected items.

Jesse · Accepted Answer · 2013-03-08 20:36:18Z

-2

protected void ButtonRemoveSelectedItem_Click(object sender, EventArgs e)
{
    int position = 0;

    for (byte i = 0; i < ListBox2.Items.Count; i++)
    { 
        position = ListBox2.SelectedIndex ;
    }

    ListBox2.Items.RemoveAt(position);
}

edited Mar 8, 2013 at 20:36

Jesse

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answered Mar 8, 2013 at 20:17

Manoja

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1 Comment

Jesse Over a year ago

Hi, welcome to Stack Overflow! Code-only answers are generally not welcomed in the community, because they leave readers the task of figuring out what's going on. Please provide some explanation of how and why your code works. Take a look at how to answer for more info.

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