Trying to reference a variable in page load

I am trying to reference a value from a database, called CompanyID (a column in the database) on page load using Visual Web Developer 2005.  Here is the code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
UserIDValue.Text = Membership.GetUser().ProviderUserKey.ToString()

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