CheckedListBox.CheckedItems Property


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Collection of checked items in this CheckedListBox.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public CheckedListBox.CheckedItemCollection CheckedItems { get; }

The collection is a subset of the objects in the Items collection, representing only those items whose System.Windows.Forms.CheckState is Checked or Indeterminate. The indexes in this collection are in ascending order.

The following example enumerates the checked items in the CheckedListBox.CheckedIndexCollection to see what check state an item is in. The example demonstrates using the CheckedIndices property to get the CheckedListBox.CheckedIndexCollection, and the CheckedItems property to get the CheckedListBox.CheckedItemCollection.

The first loop uses the GetItemCheckState method to get the CheckState of each checked item, given the index of the item. The second loop also uses GetItemCheckState, but uses the ListBox.ObjectCollection.IndexOf method to retrieve the index for the item.

To run this example, perform the following steps:

  1. Create a new Windows Forms application.

  2. Add a CheckedListBox and a Button to the form.

  3. Name the button WhatIsChecked, add a handler for its Click event, and copy in the code from the body of the following handler.

  4. Add some items to the CheckedListBox.

  5. Run the example and check some of the check boxes in the list box.

  6. Click the button.

    You will see a series of message boxes that indicate which items were checked.

private void WhatIsChecked_Click(object sender, System.EventArgs e) {
    // Display in a message box all the items that are checked.

    // First show the index and check state of all selected items.
    foreach(int indexChecked in checkedListBox1.CheckedIndices) {
        // The indexChecked variable contains the index of the item.
        MessageBox.Show("Index#: " + indexChecked.ToString() + ", is checked. Checked state is:" +
                        checkedListBox1.GetItemCheckState(indexChecked).ToString() + ".");

    // Next show the object title and check state for each item selected.
    foreach(object itemChecked in checkedListBox1.CheckedItems) {

        // Use the IndexOf method to get the index of an item.
        MessageBox.Show("Item with title: \"" + itemChecked.ToString() + 
                        "\", is checked. Checked state is: " + 
                        checkedListBox1.GetItemCheckState(checkedListBox1.Items.IndexOf(itemChecked)).ToString() + ".");


.NET Framework
Available since 1.1
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