MetaDescription and MetaKeywords

Hi...
I have a alreday developed web application. Now I am wishing to add MetaDescription and MetaKeywords feature. I have downloaded codes from here ****. This is my own post but now it is wondering me when I am using that code and codebehind in my project. Well here is my codes and errors.
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Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        ' Changing title of the Page
        Page.Header.Title = String.Format("Header Content ({0})", DateTime.Now)
        ' Changing background of ...