Set Template Label Value To Vb.Net Variable

I need to create a vb.net variable from a label's value inside of a template field.  This is what my template looks like:
 

<asp:TemplateField>
                    <ItemTemplate> 
                    <asp:Label ID="Label1" runat="server"  Text='<%# Bind("ctlmap") %>'></asp:Label>  </ItemTemplate> 
                    </asp:TemplateField>

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How can I take the value of Label1 and set it to the string "ctlmap" in the following code?:
 

Sub GridView1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)


   
     Dim row As GridViewRow = GridView1.SelectedRow
     
     dim ctlmap,bill_group,bill_parcel,propertyid,special as string
     ctlmap = HOW DO I SET THIS TO LABEL1?
     Session("ctlmap") = ctlmap
     response.redirect("Totals_test.aspx")
 

  End Sub

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