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RadGrid: Invalid postback encountered moving to next page on RadGrid

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Grid

This is a migrated thread and some comments may be shown as answers.

JR asked on 20 Jul 2011, 01:53 AM

Hi Telerik,

I'm encountering the error below when i tried to use the arrow to in my radgrid to move the page to the next/previous page. The weird thing is when i move the page by clicking on the page number instead of the arrow im not encountering the error. Below is a sample code that recreates the error i'm encountering.

Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

ASPX:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication9.WebForm1" %>



<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">



<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title></title>

</head>

<body >

    <form id="form1" runat="server">

        <telerik:RadScriptManager ID="RadScriptManager1" Runat="server" />

        <asp:Label ID="lbl_Notification" runat="server" Font-Bold="true" Font-Size="Large" Text="No Row right clicked" />

        <br />

        <telerik:RadGrid ID="RadGrid1" runat="server"

            AllowFilteringByColumn="true"

            AutoGenerateColumns="false"

            AllowPaging="true"

            AllowSorting="true"

            ShowGroupPanel="true"

            OnNeedDataSource="RadGrid1_NeedDataSource"

            OnItemDataBound="RadGrid1_ItemDataBound"

            PageSize="15">

            <MasterTableView GroupLoadMode="Client" TableLayout="Fixed" >

                <Columns>

                    <telerik:GridBoundColumn DataField="item1" HeaderText="Item1" />

                    <telerik:GridBoundColumn DataField="item2" HeaderText="Item2" />

                    <telerik:GridBoundColumn DataField="item3" HeaderText="Item3" />

                    <telerik:GridBoundColumn DataField="item4" HeaderText="Item4" />

                    <telerik:GridBoundColumn DataField="item5" HeaderText="Item5" />

                </Columns>

            </MasterTableView>

            <ClientSettings AllowGroupExpandCollapse="True" ReorderColumnsOnClient="True"

                AllowDragToGroup="True" AllowColumnsReorder="True" EnableRowHoverStyle="True" />

            <FilterMenu EnableImageSprites="False"></FilterMenu>

        </telerik:RadGrid>

    </form>

</body>

</html>

C#

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using Telerik.Web.UI;

using System.Collections.ObjectModel;



namespace WebApplication9

{

    public partial class WebForm1 : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            //If i remove the binding on page load the error with regards to the post back is not encountered

            //when clicking the arrow and the number. However the label is not properly updated and the radcontextmenu is no longer

            //available on right click after postback.

            RadGrid1.Rebind();

        }



        protected void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)

        {

            ObservableCollection<GridItem> items = new ObservableCollection<GridItem>();

            for (int i = 0; i < 20; i++)

                items.Add(new GridItem(i + 1));



            RadGrid1.DataSource = items;

        }



        protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)

        {

            if (e.Item.DataItem != null && e.Item.DataItem.GetType() == typeof(GridItem))

            {

                var menu = new RadContextMenu();

                menu.Targets.Add(new ContextMenuElementTarget() { ElementID = e.Item.ClientID, });



                RadMenuItem menu1 = new RadMenuItem("Menu1");

                menu1.Value = (e.Item.ItemIndex + 1).ToString();

                menu1.Attributes["Column1"] = (e.Item.DataItem as GridItem).item1;

                RadMenuItem menu2 = new RadMenuItem("Menu2");

                menu2.Value = (e.Item.ItemIndex + 1).ToString();

                menu2.Attributes["Column1"] = (e.Item.DataItem as GridItem).item1;

                RadMenuItem menu3 = new RadMenuItem("Menu3");

                menu3.Value = (e.Item.ItemIndex + 1).ToString();

                menu3.Attributes["Column1"] = (e.Item.DataItem as GridItem).item1;

                RadMenuItem menu4 = new RadMenuItem("Menu4");

                menu4.Value = (e.Item.ItemIndex + 1).ToString();

                menu4.Attributes["Column1"] = (e.Item.DataItem as GridItem).item1;

                RadMenuItem menu5 = new RadMenuItem("Menu5");



                RadMenuItem subItem1 = new RadMenuItem("subMenu1") { Value = (e.Item.ItemIndex + 1).ToString() };

                subItem1.Attributes["Column1"] = (e.Item.DataItem as GridItem).item1;



                RadMenuItem subItem2 = new RadMenuItem("subMenu2") { Value = (e.Item.ItemIndex + 1).ToString() };

                subItem2.Attributes["Column1"] = (e.Item.DataItem as GridItem).item1;



                menu5.Items.Add(subItem1);

                menu5.Items.Add(subItem2);



                menu.Items.Add(menu1);

                menu.Items.Add(menu2);

                menu.Items.Add(menu3);

                menu.Items.Add(menu4);

                menu.Items.Add(menu5);

                menu.ItemClick += new RadMenuEventHandler(menu_ItemClick);

                RadGrid1.Controls.Add(menu);

            }

        }



        void menu_ItemClick(object sender, RadMenuEventArgs e)

        {

            lbl_Notification.Text = e.Item.Text + "selected from the radcontextmenu for\nRow " + e.Item.Value + "\n with Column1= " + e.Item.Attributes["Column1"];

        }

    }



    public class GridItem

    {

        public string item1 { get; set; }

        public string item2 { get; set; }

        public string item3 { get; set; }

        public string item4 { get; set; }

        public string item5 { get; set; }



        public GridItem(int rowNum)

        {

            item1 = "dsadas" + rowNum;

            item2 = "dsadas" + rowNum;

            item3 = "itdsadsaem" + rowNum;

            item4 = "idsadsatem" + rowNum;

            item5 = "itedsadam" + rowNum;

        }

    }

}

RadGrid: Invalid postback encountered moving to next page on RadGrid

4 Answers, 1 is accepted