2 quests 1) get current user creationdate 2) control out of context

Hi,

2 questions here. How would I go about in getting the current logged in user creationdate? I'm trying to calculate an expiry date based on creation date. Also why would the ExpDate label control be out of context?
protected void Page_Load(object sender, EventArgs e)
{

DateTime CreateDate = Membership.CreationDate;;
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