Question

In my CheckedListBox app I want to allow only a single item to be checked.

I have these properties already set

checkOnClick = true;
SelectionMode = One;

Any advise will be appreciated

Answer 1

uncheck all other items in ItemCheck event as below :

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e) {
      for (int ix = 0; ix < checkedListBox1.Items.Count; ++ix)
        if (ix != e.Index) checkedListBox1.SetItemChecked(ix, false);
    }