Aspx Page

<ig:WebHierarchicalDataGrid ID="gridCustomer" runat="server" DataKeyFields="BRLE_ID"
                                AutoGenerateColumns="false" AutoGenerateBands="false" InitialExpandDepth="0"
                                OnInitializeRow="InitializeRow" EnableViewState="false" Width="98%" StyleSetName="Nautilus"
                                InitialDataBindDepth="4"/>
<Columns>
</Columns>

 <Bands>
  <ig:Band DataKeyFields="BRHE_FILENAME" AutoGenerateColumns="false" DefaultColumnWidth="250px">
<Columns>
</Columns>

<Behaviors>
  <ig:Paging Enabled="true" PageSize="10" PagerMode="NumericFirstLast" QuickPages="2" />
                                           

<Behaviors>
   <ig:Paging Enabled="true" PageSize="10" PagerMode="NumericFirstLast" QuickPages="2">
                                    </ig:Paging>
<Behaviors/>

</ig:WebHierarchicalDataGrid>


aspx.cs Code behind ,OnInit ,we bind the data for paging

protected override void OnInit(EventArgs e)
    {
        if (Session["dsreport"] != null)
        {
            if (!(Request.Params.GetValues(0)[0].EndsWith(butFilter.ID) || Request.Params.GetValues(0)[0].EndsWith(butReset.ID) || Request.Params.GetValues(0)[0].EndsWith(ddlPageSize.ID)))
            {                
                gridCustomer.DataMember = "Table";
                gridCustomer.Bands[0].DataMember = "Table1";
                gridCustomer.DataSource = (DataSet)Session["dsreport"];
                gridCustomer.DataBind();
                
            }
            gridCustomer.Bands[0].Columns["BRHE_ID"].Hidden = false;
        }
        else { }
        base.OnInit(e);
    }

Also in Posback,the below code is written

if (Session["dsreport"] != null)
        {
            gridCustomer.Behaviors.Paging.PageIndex = 0;
            gridCustomer.Behaviors.Paging.PageSize = Convert.ToInt32(hidPageSize.Value);
            gridCustomer.Bands[0].Behaviors.Paging.PageSize = 10;
            gridCustomer.Behaviors.Paging.Enabled = true;            
            gridCustomer.DataMember = "Table";
            gridCustomer.Bands[0].DataMember = "Table1";
            gridCustomer.DataSource = (DataSet)Session["dsreport"];
            gridCustomer.DataBind();
            gridCustomer.RefreshBehaviors();
           // gridCustomer.DataBind();
            //upd.Update();
        }