rad grid, drag and drop

<%@ Page Title="" Language="C#" MasterPageFile="~/Masters/admin.master" AutoEventWireup="true" CodeFile="testDragDrop.aspx.cs" Inherits="Admin_policy_testDragDrop" %><%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %><asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server"></asp:Content><asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"><%--<telerik:RadScriptManager runat="server" ID="RadScriptManager1" />--%>    <telerik:RadFormDecorator ID="RadFormDecorator1" DecoratedControls="All" runat="server"        Skin="Metro" EnableRoundedCorners="false"></telerik:RadFormDecorator>    <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Width="256px" Height="64px" MinDisplayTime="5000">    <asp:Label ID="Label2" runat="server" ForeColor="Red">Loading... </asp:Label>    </telerik:RadAjaxLoadingPanel><%--    <asp:Image ID="Image1" runat="server" Width="224px" Height="48px" ImageUrl="~/Loading.gif"></asp:Image>--%>        <telerik:RadAjaxManager runat="server" ID="radAjax" DefaultLoadingPanelID="RadAjaxLoadingPanel1">        <AjaxSettings>            <telerik:AjaxSetting AjaxControlID="grdPolicy">                <UpdatedControls>                    <telerik:AjaxUpdatedControl ControlID="grdPolicy" ></telerik:AjaxUpdatedControl>                </UpdatedControls>            </telerik:AjaxSetting>        </AjaxSettings>    </telerik:RadAjaxManager>    <telerik:RadScriptBlock runat="server" ID="scriptBlock">        <script type="text/javascript">        //<![CDATA[            function onRowDropping(sender, args) {                if (sender.get_id() == "<%=grdPolicy.ClientID %>") {                    var node = args.get_destinationHtmlElement();                    if (!isChildOf('<%=grdPolicy.ClientID %>', node)) {                        args.set_cancel(true);                    }                }                            }            function isChildOf(parentId, element) {                while (element) {                    if (element.id && element.id.indexOf(parentId) > -1) {                        return true;                    }                    element = element.parentNode;                }                return false;            }            //]]>        </script>    </telerik:RadScriptBlock>    <div class="exWrap">        <p class="howto">            Select and drag orders from pending to shipped when dispatched<br />            Reorder pending orders on priority by drag and drop<br />            Drop a shipped order over the recycle bin to delete it</p>        <div style="float: left; padding: 0 6px 0 10px">            <h2 style="color: #9c3608">                Pending Orders</h2>            <telerik:RadGrid runat="server" ID="grdPolicy" AutoGenerateColumns="false"                 AllowPaging="True" Width="350px"  AllowMultiRowSelection="true"                 PageSize="30" onneeddatasource="grdPolicy_NeedDataSource"                 onrowdrop="grdPolicy_RowDrop" ondeletecommand="grdPolicy_DeleteCommand"                 onitemcommand="grdPolicy_ItemCommand" >                <MasterTableView DataKeyNames="PolicyId" Width="100%" TableLayout="Fixed" CssClass="table table-bordered table-primary" >                    <Columns>                        <telerik:GridDragDropColumn HeaderStyle-Width="18px" Visible="false">                        </telerik:GridDragDropColumn>                        <telerik:GridBoundColumn HeaderText="Policy Name" DataField="Name"></telerik:GridBoundColumn>                                              <telerik:GridTemplateColumn>                        <ItemTemplate>                            <asp:HyperLink runat="server" NavigateUrl='<%# Eval("PolicyId","edit.aspx?PolicyId={0}") %>' CssClass="btn-action no-border glyphicons edit btn-table"><i></i></asp:HyperLink>                                                    </ItemTemplate>                      </telerik:GridTemplateColumn>                      <telerik:GridTemplateColumn>                        <ItemTemplate>                            <asp:LinkButton ID="BtnDelete" runat="server" CssClass="btn-action no-border glyphicons remove_2 btn-table" CommandArgument='<%# Eval("PolicyId") %>' CommandName="Delete" OnClientClick="javascript: return confirm('Are you sure?');"><i></i></asp:LinkButton>                        </ItemTemplate>                      </telerik:GridTemplateColumn>                    </Columns>                </MasterTableView>                <ClientSettings AllowRowsDragDrop="True" AllowColumnsReorder="true" ReorderColumnsOnClient="true">                    <Selecting AllowRowSelect="True" EnableDragToSelectRows="false"></Selecting>                    <ClientEvents OnRowDropping="onRowDropping"></ClientEvents>                    <Scrolling AllowScroll="true" UseStaticHeaders="true"></Scrolling>                </ClientSettings>                <%--<PagerStyle Mode="NumericPages" PageButtonCount="4"></PagerStyle>--%>            </telerik:RadGrid>        </div>                <div style="clear: both;">        </div>        <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />    </div></asp:Content>

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Data.SqlClient;using System.Web.UI;using Telerik.Web.UI;using HRASP.Entities;using HR.Managers.Library.Managers;public partial class Admin_policy_testDragDrop : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {        grdPolicy.MasterTableView.GetColumn("DragDropColumn").Visible = true;    }    protected TList<Policy> Policies    {        get        {            try            {                object obj = Session["Policies"];                if (obj == null)                {                    obj = PolicyManager.GetAllPolicies();                    if (obj != null)                    {                        Session["Policies"] = obj;                    }                    else                    {                        obj = new TList<Policy>();                    }                }                return (TList<Policy>)obj;            }            catch (Exception ex)            {                Session["PendingPolicys"] = null;            }            return new TList<Policy>();        }        set { Session["Policies"] = value; }    }    protected void grdPolicy_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)    {        grdPolicy.DataSource = Policies;    }    private void UpdateSortOrder()    {        TList<Policy> list = (TList<Policy>)Policies;        PolicyManager.UpdatePoliciesSortOrder(list);    }    protected void grdPolicy_RowDrop(object sender, GridDragDropEventArgs e)    {        if (string.IsNullOrEmpty(e.HtmlElement))        {            // check drag from which grid             if (e.DraggedItems[0].OwnerGridID == grdPolicy.ClientID)            {                // check drop to whcih grid                if (e.DestDataItem != null && e.DestDataItem.OwnerGridID == grdPolicy.ClientID)                {                    //rePolicy items in pending grid                    TList<Policy> list = Policies;                    var obj1 = e.DestDataItem.GetDataKeyValue("PolicyId");                    Policy p = GetPolicy(list, (Guid)e.DestDataItem.GetDataKeyValue("PolicyId"));                    int destinationIndex = list.IndexOf(p);                    if (e.DropPosition == GridItemDropPosition.Above && e.DestDataItem.ItemIndex > e.DraggedItems[0].ItemIndex)                    {                        destinationIndex -= 1;                    }                    if (e.DropPosition == GridItemDropPosition.Below && e.DestDataItem.ItemIndex < e.DraggedItems[0].ItemIndex)                    {                        destinationIndex += 1;                    }                    TList<Policy> PolicysToMove = new TList<Policy>();                    foreach (GridDataItem draggedItem in e.DraggedItems)                    {                        Policy tmpPolicy = GetPolicy(list, (Guid)draggedItem.GetDataKeyValue("PolicyId"));                        if (tmpPolicy != null)                            PolicysToMove.Add(tmpPolicy);                    }                    foreach (Policy PolicyToMove in PolicysToMove)                    {                        list.Remove(PolicyToMove);                        list.Insert(destinationIndex, PolicyToMove);                    }                    Policies = list;                    grdPolicy.Rebind();                    //int destinationItemIndex = destinationIndex - (grdPendingPolicys.PageSize * grdPendingPolicys.CurrentPageIndex);                    //e.DestinationTableView.Items[destinationItemIndex].Selected = true;                }            }        }    }    private static Policy GetPolicy(IEnumerable<Policy> PolicysToSearchIn, Guid policyId)    {        foreach (Policy Policy in PolicysToSearchIn)        {            if (Policy.PolicyId == policyId)            {                return Policy;            }        }        return null;    }    protected void Button1_Click(object sender, EventArgs e)    {        UpdateSortOrder();    }    protected void grdPolicy_DeleteCommand(object sender, GridCommandEventArgs e)    {    }    protected void grdPolicy_ItemCommand(object sender, GridCommandEventArgs e)    {        //if (e.CommandName == "Delete")        //{        //    string s = e.CommandArgument.ToString();        //}        try        {            Guid uid = new Guid();            if (Guid.TryParse(e.CommandArgument.ToString(), out uid))            {                if (uid != Guid.Empty)                {                    if (e.CommandName == "Delete")                    {                        PolicyManager.DeletePolicy(uid);                        Policies = null;   // get latest data from  db                    }                }            }        }        catch (Exception ex)        {        }    }}