How to uncheck disabled checkedlistbox in c# winforms?

Question

In the above image "ug(User Group)" is a row in a checkedlistbox with enabled property to false. How to uncheck "ug(User Group)" in disabled state.

Answer 1

You can easily use

checkedListBox1.SetItemChecked(2, false);

or

checkedListBox1.SetItemCheckState(2, CheckState.Unhecked);

The Enabled property of the CheckedListBox has no impact on the check state of the items or those two methods.

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MSDN links:

• CheckedListBox.SetItemChecked()
• CheckedListBox.SetItemCheckState()

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UPDATE: Disabling a single item in the CheckedListBox instead of disabling the whole control is not possible out of the box.

If you want to prevent the user from changing the check state of one special item, you need to subscribe to the ItemCheck event of the CheckedListBox :

checkedListBox1.ItemCheck += (sender, e) =>
{
    if (e.Index == 2)
        e.NewValue = CheckState.Unchecked;
}

This event is fired before the check state of the item changed. e is an ItemCheckEventArgs that contains the item's Index , its current check state ( CurrentValue ) and the check state it shall have afterwards ( NewValue ).

So setting e.NewValue = CheckState.Unchecked prevents the item from being checked again by the user.