Hi guys,

 I was hoping for any kind souls to help me solve this problem.

I was trying to do a nested datagrid which i found in : http://www.codeproject.com/aspnet/EditNestedDataGrid.asp

Bascially, my idea was to use the nested datagrid to present a list of Inventory. 

For certian Inventory, there are spare parts for the inventory (example : a Computer(Inventory) has many spare parts like HDD(spare part), RAM(spare part) and etc) 

I would like to present the spare parts in the nested datagrid under each inventory

 Here's the problem :

When i run the page and click on the linkbutton i got this error message :

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.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: 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.

Source Error:

[ArgumentException: 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.]
   System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument) +2127900
   System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument) +106
   System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) +32
   System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102

But although the error message does not appear again, when i click on the imagebutton, it didnt execute the msgbox command. However, the linkButton did work. Hopefully you guys who are more experienced can help me. I thank your in advance. Below are the aspx file code and some of the vb file code. If your can provide the solutions in vb.net, that will be great.

The following is my aspx file :

<%@ Page Language="VB" MasterPageFile="~/MasterPage.master" AutoEventWireup="false"

<%-- Register web part for search--%>

<%@ Register Src="~/Page_Inventory/SearchInventory.ascx" TagPrefix="Search" TagName="InventorySearch" %>

<asp:Label ID="lblHeader" runat="server" Text="Inventory" CssClass="Header"></asp:Label>

<hr/>

<asp:WebPartManager ID="WPMInventory" runat="server">

</asp:WebPartManager>

<asp:WebPartZone ID="SearchInventory" Width="400" runat="server" BorderColor="#CCCCCC"

Font-Names="Verdana" Padding="6" HeaderText="Search">

<PartChromeStyle BackColor="#F7F6F3" BorderColor="#E2DED6" Font-Names="Verdana" ForeColor="White" />

<CloseVerb Visible="False" />

<MinimizeVerb Enabled="true" Visible="true" />

<MenuLabelHoverStyle ForeColor="#E2DED6" />

<EmptyZoneTextStyle Font-Size="0.8em" />

<MenuLabelStyle ForeColor="White" />

<MenuVerbHoverStyle BackColor="#F7F6F3" BorderColor="#CCCCCC" BorderStyle="Solid"

BorderWidth="1px" ForeColor="#333333" />

<HeaderStyle Font-Size="0.7em" ForeColor="#CCCCCC" HorizontalAlign="Center" />

<MenuVerbStyle BorderColor="#5D7B9D" BorderStyle="Solid" BorderWidth="1px" ForeColor="White" />

<PartStyle Font-Size="0.8em" ForeColor="#333333" />

<TitleBarVerbStyle Font-Size="0.6em" Font-Underline="False" ForeColor="White" />

<MenuPopupStyle BackColor="#5D7B9D" BorderColor="#CCCCCC" BorderWidth="1px" Font-Names="Verdana"

Font-Size="0.6em" />

<PartTitleStyle BackColor="#5D7B9D" Font-Bold="True" Font-Size="0.8em" ForeColor="White" />

<ZoneTemplate>

<Search:InventorySearch ID="InventorySearchAscx" title="Search" runat="server" />

</ZoneTemplate>

</asp:WebPartZone>

<table width="100%">

<tr>

<td colspan="2">

<asp:DataGrid ID="grdData" runat="server" AllowPaging="True" AllowSorting="True"

AutoGenerateColumns="False" CssClass="ui_Datagrid_Style1" GridLines="None">

<FooterStyle CssClass="ui_Datagrid_Style1_FooterStyle" />

<SelectedItemStyle CssClass="ui_Datagrid_Style1_SelectedItemStyle" />

<PagerStyle CssClass="ui_Datagrid_Style1_PagerStyle" Mode="NumericPages" />

<HeaderStyle CssClass="ui_Datagrid_Style1_HeaderStyle" />

<ItemStyle CssClass="ui_Datagrid_Style1_ItemStyle" />

<EditItemStyle CssClass="ui_Datagrid_Style1_EditItemStyle" />

<AlternatingItemStyle CssClass="ui_Datagrid_Style1_AlternatingItemStyle" />

<Columns>

<asp:TemplateColumn>

<HeaderStyle Width="9px"></HeaderStyle>

<ItemTemplate>

<asp:ImageButton id="ImageButton1" runat="server" Width="9px" Height="9px" ImageUrl="~/Images/Plus.gif"

CommandName="Expand"></asp:ImageButton>

</ItemTemplate>

</asp:TemplateColumn>

<asp:BoundColumn DataField="sItemId" HeaderText="Item ID" SortExpression="sItemId"></asp:BoundColumn>

<asp:BoundColumn DataField="sItemTypeId" HeaderText="Item Type" SortExpression="sItemTypeId">

</asp:BoundColumn>

<asp:BoundColumn DataField="nQtyOnHand" HeaderText="Quantity On Hand"></asp:BoundColumn>

<asp:TemplateColumn>

<ItemTemplate>

<asp:LinkButton ID="lnkbtnView" runat="server" CommandName="View" Text="View"></asp:LinkButton>

</ItemTemplate>

</asp:TemplateColumn>

<asp:TemplateColumn>

<ItemTemplate>

<asp:PlaceHolder ID="Expanded" Runat="server" Visible="False">

</td></tr>

<tr>

<td width="9">&nbsp;</td>

<td colspan="7">

CellPadding="2" BackColor="#f1f1f1" Font-Name="Verdana" Font-Size="8pt" AutoGenerateColumns=false ItemStyle-VerticalAlign="Top"

ShowFooter="True" AllowPaging="True" AllowSorting="True" EnableViewState=true>

<AlternatingItemStyle BackColor="White"></AlternatingItemStyle>

<HeaderStyle Font-Bold="True" HorizontalAlign="Center" ForeColor="White" BackColor="#0083C1"></HeaderStyle>

<Columns>

<asp:BoundColumn DataField="sItemId" HeaderText="Item ID" SortExpression="sItemId"></asp:BoundColumn>

<asp:BoundColumn DataField="sItemTypeId" HeaderText="Item Type" SortExpression="sItemTypeId">

</asp:BoundColumn>

<asp:BoundColumn DataField="nQtyOnHand" HeaderText="Quantity On Hand"></asp:BoundColumn>

<asp:TemplateColumn>

<ItemTemplate>

<asp:LinkButton ID="lnkbtnView" runat="server" CommandName="Edit" Text="View"></asp:LinkButton>

</ItemTemplate>

</asp:TemplateColumn>

</Columns>

<PagerStyle Mode="NumericPages"></PagerStyle>

</asp:DataGrid>

</asp:PlaceHolder>

</ItemTemplate>

</asp:TemplateColumn>

</Columns>

</asp:DataGrid>

</td>

</tr>

<tr>

<td align="left" style="height: 31px">

<asp:Button ID="btnAdd" runat="server" CssClass="button" Text="Add" />&nbsp;</td>

</tr>

</asp:Content>

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

End Sub

If e.CommandName.Equals("Edit") Then

MsgBox("here")

If e.CommandName.Equals("View") Then

Response.Redirect("adm_Inventory_Edit.aspx")

End If

End Sub

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Hi:

  Please try:

<%@ Page EnableEventValidation="false"

  But please note this will decrease security.

Regards

i figure out the problem of it already. Thanks for the help. However this brings me to another problem. I will post the details of the problem i encounter in the next post.