lab.Text = (string)holidaylist[e.Day.Date.Month, e.Day.Date.Day];

lab.Text = (string)holidaylist[e.Day.Date.Month][e.Day.Date.Day];

Superguppie.
Please remember to click “Mark as Answer” on the post that helps you. This can be beneficial to other community members reading the thread.
When all you've got is a Hammer, Every Problem looks like a Nail. Michael Swain.