Read rendering parameters

<div id="CenterColumn">

  <sc:Placeholder Key="centercolumn" runat="server"></sc:Placeholder>

    <%

        var sublayout = ((Sublayout)this.Parent);

        NameValueCollection parameters =              Sitecore.Web.WebUtil.ParseUrlParameters(sublayout.Parameters);

        var param1 = parameters.Get("Greeting");

       

    %>

        <div><%=param1 %></div>   

</div>