How do I select the top 30 items in a C# checkbox control with a single button click

Question

I have windows app that I am building and want to be able to click one button and select the top 30 entries in a check box control. The select all is easy. Of course I could be overlooking the simplicity here, but it is not making sense right now.

Edited; Here is what I have that works for selecting all entries.

        private void ckTop_CheckedChanged(object sender, EventArgs e)
    {
        // either check all or uncheck all
        if (ckTop.Text == "Check all")
        {
            for (int i = 0; i < CLB.Items.Count; i++) CLB.SetItemChecked(i, true);
            ckTop.Text = "Uncheck all";
        }
        else
        {
            for (int i = 0; i < CLB.Items.Count; i++) CLB.SetItemChecked(i, false);
            ckTop.Text = "Check all";
        }
    }

I have tried setting the CLB.SetItemChecked(i, true); to a value of 4 to see if it would select the fourth entry, but that did not work.

Answer 1

this should do the trick for you,

for (var i = 0; i < 30; i++)
{
    checkedListBox1.SetItemChecked(i, true);
}