How to program a single check-box to checklistbox items?

Question

I need to program in a single check-box, so when it is "marked" select all my files present in a checklistbox and "unchecked" the reverse.

I created a check-box in my 'mark/deselect all' application, which I need when checking it to select all my collaborators that I display in a checkbox below and when unchecking it, to deselect them flags of all of them from that same checklistbox.

I started with something like this:

if (checkBox1.Checked == true)
    foreach (String Arquivo in ck_Colaboradores.CheckedItems)
    {

    }
else if(checkBox1.Checked == false)
    foreach (String Arquivo in ck_Colaboradores.CheckedItems)
    {

    }

Answer 1

Add an event CheckedChanged at the CheckBox and change the value of the CheckListBox based on the value of CheckBox leading.

private void checkBoxMarcarDesmarcarTodos_CheckedChanged(object sender, EventArgs e)
{
    var isChecked = ((CheckBox)sender).Checked;

    for (int i = 0; i < checkedListBox1.Items.Count; i++)
    {
        checkedListBox1.SetItemChecked(i, isChecked);
    }
}

See working:

Answer 2

You can scroll through your checkbox list and assign the checkbox state that will control the others, example:

for (int i = 0; i < ck_Colaboradores.Items.Count; i++)
{
    ck_Colaboradores.SetItemChecked(i, checkBox1.Checked);
}