How to change Ajak ToolkitScriptManager on behind code ?

Dear All,

For previous  ajak control toolkit  i used ajak control scriptManager, after i upgraded the latest AjakControl toolkit, i changed to ToolkitScriptManager ? May i know how to write  toolkit script manage on behind code in C#? kindly advise, thank you

<ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"></ajaxToolkit:ToolkitScriptManager>

previous Script manager in C# 

namespace web.DashBoard
{
    public partial class Web_Monitor : System.Web.UI.Page
    {

     
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                FillPivotQueryData();
                FillQueryData();
            }

    
            ScriptManager scriptManager = ScriptManager.GetCurrent(this.Page);
            scriptManager.RegisterPostBackControl(this.ExportToCSVIB);
       
        }