Hide a button in gridview based on a value of another control inside the GV (VB.NET)

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ASP.NET

Gridview

Hello,
I'm trying to Hide a button inside gvResults (gridview) based on the value of another control inside the gridview.

both controls are templatefield.

Protected Sub gvResults_RowDataBound(sender As Object, e As GridViewRowEventArgs)
        If e.Row.RowType = DataControlRowType.DataRow Then

            Dim SPass As String = TryCast(e.Row.FindControl("lblSharePass"), Label).Text
            Dim ShareButton As Button = TryCast(e.Row.FindControl("btnShare"), Button)

            If Not String.IsNullOrEmpty(SPass) Then
                ShareButton.Visible = False
            Else
                ShareButton.Visible = True
            End If
        End If

    End Sub

lblSharePass is binded to a column in the database

<asp:Label ID="lblSharePass" runat="server" Text='<%#Bind("SharePass") %>'></asp:Label>

I can't seem to get it right. btnShare should not be visible if lblSharePass contains a value.. However, I tried to specify the value like SPass = "1234" and it works..

Can someone please help.

What I have tried:

i tried isnothing, "", vbnullstring but non of them works. I also created the same sub in RowCreated but with unsuccessful results.