How to find label text current font size?

<form id="form1" runat="server">
        <asp:label id="Label1" runat="server" text="First Name" font-size="XX-Large" xmlns:asp="#unknown"></asp:label>    
    </form>

protected void Page_Load(object sender, EventArgs e)
        {
           FontSize fontSize = Label1.Font.Size.Type;
           string size = fontSize.ToString();
            Response.Write(size);
        }