radgrid add new record button doesn't work

[M]

When I click on the  'Refresh' nothing happens.
When I click on the 'Add New Record' I'm getting this error:
Line: 15
Error: Sys.WebForms.PageRequestManagerServerErrorException: 'ddl_menu' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value

I'm using ASP.NET Ajax Q3 2009 NET35,  v.2009, 3, 1208, 35
What am I missing?
Here is the code:

<%@ Page Title="" Language="C#" MasterPageFile="~/admin/AdminMasterPage.master" AutoEventWireup="true" CodeFile="pdf_docs.aspx.cs" Inherits="admin_pdf_docs" %>

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

 

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">

</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">

    <tr>

        <td width="100%">

            <center><b><asp:Label ID="lbl_page_title" runat="server" CssClass="lbl_title"></asp:Label></b></center>

        </td>

    </tr>

    <tr>

        <td width="100%" style="border-style: solid none none none; border-top-width: 1px; border-top-color: #000000">

              

        </td>

    </tr>

    <tr>

        <td width="100%">

            <asp:Label ID="lbl_content" runat="server" />

        </td>

    </tr>

    <tr>

        <td width="100%">

            <hr color="#999999" size="1">

        </td>

    </tr>

    <tr>

        <td width="100%" align="left">

        <p id="divMsgs" runat="server">

            <asp:Label ID="Label1" runat="server" EnableViewState="False" Font-Bold="True" ForeColor="#FF8080"></asp:Label>

            <asp:Label ID="Label2" runat="server" EnableViewState="False" Font-Bold="True" ForeColor="#00C000"></asp:Label>

        </p>

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

                AllowFilteringByColumn="True"

                AllowPaging="True"

                AllowSorting="True"

                AutoGenerateColumns="False"

                DataSourceID="SqlDataSource1"

                OnItemDeleted="RadGrid1_ItemDeleted"

                OnItemInserted="RadGrid1_ItemInserted"

                OnItemUpdated="RadGrid1_ItemUpdated"

                GridLines="None"

                AllowAutomaticDeletes="True"

                AllowAutomaticInserts="True"

                AllowAutomaticUpdates="True" Skin="Outlook">

                <ClientSettings AllowColumnsReorder="True">

                    <Selecting AllowRowSelect="True" />

                </ClientSettings>

                <GroupingSettings CaseSensitive="false" />

            <MasterTableView autogeneratecolumns="False" DataKeyNames="id" DataSourceID="SqlDataSource1" CommandItemDisplay="TopAndBottom" HorizontalAlign="NotSet" AllowAutomaticInserts="true" AllowAutomaticUpdates="true" >

                <Columns>

                    <telerik:GridEditCommandColumn ButtonType="PushButton" UniqueName="EditCommandColumn">

                    </telerik:GridEditCommandColumn>

                    <telerik:GridBoundColumn DataField="s_doc_title" DefaultInsertValue="" HeaderText="s_doc_title" UniqueName="s_doc_title" SortExpression="s_doc_title">

                    </telerik:GridBoundColumn>

                    <telerik:GridBoundColumn DataField="s_doc_url" DefaultInsertValue="" HeaderText="s_doc_url" SortExpression="s_doc_url" UniqueName="s_doc_url">

                    </telerik:GridBoundColumn>

                    <telerik:GridBoundColumn DataField="d_date_uploaded" DataType="System.DateTime" DefaultInsertValue="" HeaderText="d_date_uploaded" SortExpression="d_date_uploaded" UniqueName="d_date_uploaded">

                    </telerik:GridBoundColumn>

                    <telerik:GridBoundColumn DataField="d_date_displayed" DataType="System.DateTime" DefaultInsertValue="" HeaderText="d_date_displayed" SortExpression="d_date_displayed" UniqueName="d_date_displayed">

                    </telerik:GridBoundColumn>

                    <telerik:GridCheckBoxColumn DataField="b_visible" DefaultInsertValue="" HeaderText="b_visible" UniqueName="b_visible" DataType="System.Boolean" SortExpression="b_visible">

                    </telerik:GridCheckBoxColumn>

                    <telerik:GridButtonColumn ConfirmText="Delete this Document?" ConfirmDialogType="RadWindow"

                        ConfirmTitle="Delete" ButtonType="ImageButton" CommandName="Delete" Text="Delete" UniqueName="DeleteColumn">

                        <ItemStyle HorizontalAlign="Center" CssClass="MyImageButton" />

                    </telerik:GridButtonColumn>

                </Columns>

                    <EditFormSettings ColumnNumber="3" CaptionFormatString="Edit details for {0}" CaptionDataField="id" EditColumn-ButtonType="PushButton" EditFormType="Template">

                    <FormTableItemStyle Wrap="False"></FormTableItemStyle>

                    <FormTableStyle CellPadding="2" CellSpacing="0" GridLines="Horizontal" CssClass="module" Height="110px" Width="100%"></FormTableStyle>

                    <FormMainTableStyle CellPadding="3" CellSpacing="0" Width="100%"></FormMainTableStyle>

                    <FormCaptionStyle CssClass="EditFormHeader"></FormCaptionStyle>

                    <FormMainTableStyle GridLines="None" CellSpacing="0" CellPadding="3" Width="100%" />

                    <FormTableStyle GridLines="Horizontal" CellSpacing="0" CellPadding="2" CssClass="module" Height="110px" Width="100%" />

                    <FormTableAlternatingItemStyle Wrap="False"></FormTableAlternatingItemStyle>

                    <FormStyle Width="100%" BackColor="#eef2ea"></FormStyle>

                    <EditColumn UpdateText="Update record" UniqueName="EditCommandColumn1" CancelText="Cancel edit" ButtonType="PushButton" InsertText="Insert Record" >

                    </EditColumn>

                    <FormTableButtonRowStyle HorizontalAlign="Left" CssClass="EditFormButtonRow"></FormTableButtonRowStyle>

                    <FormTemplate>

                        <table cellspacing="0" cellpadding="0" border="0">

                            <tr>

                                <td width="400">

                                    <table cellspacing="0" cellpadding="0" border="0">

                                        <tr>

                                            <td width="5">

                                            </td>

                                            <td width="375" valign="top">

                                                ID:

                                            </td>

                                            <td>

                                                <asp:Label ID="lbl_id" runat="server" Text='<%# Bind("id") %>'></asp:Label>

                                            </td>

                                        </tr>

                                        <tr>

                                            <td width="5">

                                            </td>

                                            <td width="375" valign="top">

                                                Page:

                                            </td>

                                            <td>

                                                <asp:DropDownList ID="ddl_menu" runat="server"

                                                    DataTextField="MenuText"

                                                    DataValueField="MenuId"

                                                    DataSourceID="SqlDataSource3"

                                                    SelectedValue='<%# Bind("MenuId") %>'>

                                                </asp:DropDownList>

                                            </td>

                                        </tr>

                                        <tr>

                                            <td width="5">

                                            </td>

                                            <td width="375" valign="top">

                                                Doc. Title:

                                            </td>

                                            <td>

                                                <asp:TextBox Width="240px" ID="txtbx_title" runat="server" Text='<%# Bind("s_doc_title") %>'></asp:TextBox>

                                            </td>

                                        </tr>

                                        <tr>

                                            <td width="5">

                                            </td>

                                            <td width="375" valign="top">

                                                Date Uploaded:

                                            </td>

                                            <td>

                                                <asp:TextBox Width="240px" ID="TextBox3" runat="server" Text='<%# Bind("d_date_uploaded") %>'></asp:TextBox>

                                            </td>

                                        </tr>

                                        <tr>

                                            <td width="5">

                                            </td>

                                            <td width="375" valign="top">

                                                Date Displayed:

                                            </td>

                                            <td>

                                                <asp:TextBox Width="240px" ID="TextBox4" runat="server" Text='<%# Bind("d_date_displayed") %>'></asp:TextBox>

                                            </td>

                                        </tr>

                                    </table>

                                </td>

                                <td width="400">

                                    <table>

                                        <tr>

                                            <td width="5">

                                            </td>

                                            <td width="90" valign="top">

                                                PDF File Name:

                                            </td>

                                            <td>

                                                <asp:TextBox Width="240px" ID="TextBox2" runat="server" Text='<%# Bind("s_doc_url") %>'></asp:TextBox>

                                                <asp:Button ID="btn_pdf_upload" runat="server" Text="Upload PDF File" onclick="btn_pdf_upload_Click" />

                                            </td>

                                        </tr>

                                    </table>   

                                </td>

                            </tr>

                            <tr>

                                <td colspan="2" align="center">

                                    <asp:Button ID="btnUpdate" Text='<%# (Container is GridEditFormInsertItem) ? "Insert" : "Update" %>' runat="server" CommandName='<%# (Container is GridEditFormInsertItem) ? "PerformInsert" : "Update" %>'>

                                    </asp:Button>

                                    <asp:Button ID="Button2" runat="server" Text="Cancel" CausesValidation="false" CommandName="Cancel"></asp:Button>

                                </td>

                            </tr>

                        </table>

                        </FormTemplate>

                    </EditFormSettings>            

                    <PagerStyle Position="TopAndBottom" />

                </MasterTableView>

            </telerik:RadGrid>

                <asp:SqlDataSource ID="SqlDataSource3" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>"

                    SelectCommand="SELECT [MenuId], [MenuText] FROM [tbl_menu] ORDER BY [MenuText]">

                </asp:SqlDataSource>

                     

            <br />

                <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>"

                SelectCommand="SELECT * FROM [tbl_pdf_docs] ORDER BY [MenuId]" DeleteCommand="DELETE FROM [tbl_pdf_docs] WHERE [id] = @id"

                InsertCommand="INSERT INTO [tbl_pdf_docs] ([MenuId], [s_doc_title], [s_link_title], [s_doc_url], [d_date_uploaded], [d_date_displayed], [b_visible]) VALUES (@MenuId, @s_doc_title, @s_link_title, @s_doc_url, @d_date_uploaded, @d_date_displayed, @b_visible)"

                 

                UpdateCommand="UPDATE [tbl_pdf_docs] SET [MenuId] = @MenuId, [s_doc_title] = @s_doc_title, [s_doc_url] = @s_doc_url, [d_date_uploaded] = @d_date_uploaded, [d_date_displayed] = @d_date_displayed, [b_visible] = @b_visible WHERE [id] = @id">

                <DeleteParameters>

                    <asp:Parameter Name="id" Type="Int32" />

                </DeleteParameters>

                <InsertParameters>

                    <asp:Parameter Name="MenuId" Type="String" />

                    <asp:Parameter Name="s_doc_title" Type="String" />

                    <asp:Parameter Name="s_doc_url" Type="String" />

                    <asp:Parameter Name="d_date_uploaded" Type="DateTime" />

                    <asp:Parameter Name="d_date_displayed" Type="DateTime" />

                    <asp:Parameter Name="b_visible" Type="Boolean" />

                </InsertParameters>

                <UpdateParameters>

                    <asp:Parameter Name="MenuId" Type="String" />

                    <asp:Parameter Name="s_doc_title" Type="String" />

                    <asp:Parameter Name="s_doc_url" Type="String" />

                    <asp:Parameter Name="d_date_uploaded" Type="DateTime" />

                    <asp:Parameter Name="d_date_displayed" Type="DateTime" />

                    <asp:Parameter Name="b_visible" Type="Boolean" />

                    <asp:Parameter Name="id" Type="Int32" />

                </UpdateParameters>

            </asp:SqlDataSource>

             

        </td>

    </tr>

    <telerik:RadAjaxManager runat="server">

        <AjaxSettings>

            <telerik:AjaxSetting AjaxControlID="RadGrid1">

            </telerik:AjaxSetting>

            <telerik:AjaxSetting AjaxControlID="SqlDataSource1">

                <UpdatedControls>

                    <telerik:AjaxUpdatedControl ControlID="RadGrid1" />

                    <telerik:AjaxUpdatedControl ControlID="SqlDataSource1" />

                </UpdatedControls>

            </telerik:AjaxSetting>

        </AjaxSettings>

    </telerik:RadAjaxManager>

    

</asp:Content>

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using Telerik.Web.UI;

public partial class admin_pdf_docs : System.Web.UI.Page
{
    protected void RadGrid1_ItemUpdated(object source, Telerik.Web.UI.GridUpdatedEventArgs e)
    {
        if (e.Exception != null)
        {
            e.KeepInEditMode = true;
            e.ExceptionHandled = true;
            DisplayMessage(true, "Title " + e.Item.OwnerTableView.DataKeyValues[e.Item.ItemIndex]["s_doc_title"] + " cannot be updated. Reason: " + e.Exception.Message);
        }
        else
        {
            DisplayMessage(false, "Title " + e.Item.OwnerTableView.DataKeyValues[e.Item.ItemIndex]["s_doc_title"] + " updated");
        }
    }

    protected void RadGrid1_ItemInserted(object source, GridInsertedEventArgs e)
    {
        if (e.Exception != null)
        {
            e.ExceptionHandled = true;
            e.KeepInInsertMode = true;
            DisplayMessage(true, "Title cannot be inserted. Reason: " + e.Exception.Message);
        }
        else
        {
            DisplayMessage(false, "Title inserted");
        }
    }

    protected void RadGrid1_ItemDeleted(object source, GridDeletedEventArgs e)
    {
        if (e.Exception != null)
        {
            e.ExceptionHandled = true;
            DisplayMessage(true, "Title " + e.Item.OwnerTableView.DataKeyValues[e.Item.ItemIndex]["s_doc_title"] + " cannot be deleted. Reason: " + e.Exception.Message);
        }
        else
        {
            DisplayMessage(false, "Title " + e.Item.OwnerTableView.DataKeyValues[e.Item.ItemIndex]["s_doc_title"] + " deleted");
        }
    }

    private void DisplayMessage(bool isError, string text)
    {
        Label label = (isError) ? this.Label1 : this.Label2;
        label.Text = text;
    }

    private static DataTable tblData = new DataTable();

    protected void Page_Load(object sender, System.EventArgs e)
    {


    }



    protected void btn_pdf_upload_Click(object sender, EventArgs e)
    {

        Response.Redirect("pdf_file_upload.aspx");
    }


    protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)
    {
        if (e.Item is GridEditFormItem && e.Item.IsInEditMode)
        {
            GridEditFormItem editform = (GridEditFormItem)e.Item;

            DropDownList ddl_menu_items = (DropDownList)editform.FindControl("ddl_menu");

            ddl_menu_items.DataValueField = "MenuId";
            ddl_menu_items.DataTextField = "MenuText";
            ddl_menu_items.SelectedValue = "MenuId";
            ddl_menu_items.DataBind();


        }
    }
}

[Princy]

Hello,

Please make sure that the selected value is there in the populated value. Another suggestion is to use Text property instead of selectedValue.
Also take a look in to the following help article which explains more on dropdownlist inside RadGrid.
Operations with MS DropDownList in EditItemTemplate of GridTemplateColumn.

Thanks,
Princy.

[M]

There is no Text property in an asp:DropDownList control
I tried your example and ran into errors:

Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)
at

list.SelectedValue = Session["updatedValue"];

[Elliott]

another approach is not to set
ddl_menu_items.SelectedValue = "MenuId";
if the item is a new record

use       
If TypeOf e.Item Is IGridInsertItem Then (this is VB, translate into C#)