Control Multiple Checkbox Arrays

I have two arrays of 16 checkboxes that I want to have gradually checked when a for statement runs. It looks like this:

public void Cycle()
{
   if (host == false)
        {
            CheckBox[] cboxes = relayRow.CheckBoxes;
        }                
        else if (host == true)
        {
            CheckBox[] cboxes = relayRow2.CheckBoxes;
        }
   for (int i = 0; i < 16; i++)
        {            
            cboxes[i].Checked = true;
        }
}

I am getting a red line under the 'cboxes' in the for statement saying "The name 'cboxes' does not exist in the current context." If I only use one at a time, it works perfectly, so there shouldn't be a problem with my arrays. Working one at a time is as follows:

  public void Cycle()
    {            
        CheckBox[] cboxes = relayRow.CheckBoxes;

        for (int i = 0; i < 16; i++)
        {
            cboxes[i].Checked = true;
        }
    }

There should also be not problem with my boolean 'host' since I have used it in other places and it works as intended. I'm just trying to switch between which array of 16 will be checked. Thanks in advance.