set master page title as username

I am using .net membership and have a page that takes userid and display profile information. I also want to set the username as page title but keep getting object initialise error. I am using master page.
<asp:Content ID="Content1" ContentPlaceHolderID="HeadPlaceHolder1" runat="Server"> <asp:Literal ID="litMeta" runat="server" /> </asp:Content> Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init mu = Membership.GetUser(Request.QueryString("UserId")) If Request.QueryString("UserId") <> Nothing Then litMeta.Text = "<title>" & mu.UserName & "Profile Page" & "</title>" End If End Sub


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