Refresh update panel content with new css styles

<style>

NewCSS

{

color: #00cc00;

font-weight: 700;

}

</style>

<asp:ScriptManager ID="ScriptManager1" runat="server">

</asp:ScriptManager>

<asp:UpdatePanel ID="UpdatePanel1" runat="server">

<ContentTemplate>

<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label> </ContentTemplate>

<Triggers>

<asp:AsyncPostBackTrigger ControlID="btnReload" EventName="Click" /> </Triggers>

</asp:UpdatePanel>

<asp:Button ID="btnReload" runat="server" onclick="btnReload_Click" Text="Refresh Update Panel" />

// Default.aspx.cs //

protected void btnReload_Click(object sender, EventArgs e)
   

{
       

Label1.CssClass="NewCss";
    }