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problem when i using edit / delete button in datagrid

Posted on 2006-11-19
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Last Modified: 2008-01-09
hello guys, i was using visual studio.net 2005 to develop asp.net application

My datagrid embedded with the [edit] and [delete] button in order to help me update my database!

but the error msg come up no matter i clicked either [edit] or [delete] button in my datagrid. WHY??  it's super urgent.. pls help me to solve tis problem

----------------------------------------------------------------------------------------------
my datagrid code
----------------------------------------------------------------------------------------------
<asp: DataGrid ID="MyDataGrid" runat="server" AutoGenerateColumns="False" BackColor="LightSalmon"
OnUpdateCommand="MyDataGrid_Update" OnCancelCommand="MyDataGrid_Cancel"
OnEditCommand="MyDataGrid_Edit" OnDeleteCommand="Delete_Item"  
OnPageIndexChanged="MyDataGrid_PageIndexChanged"
DataKeyField="UID"  AllowSorting="True">
<Columns>
<asp: EditCommandColumn ButtonType="PushButton" CancelText="Cancel" EditText="Edit"
  UpdateText="Update"></asp:EditCommandColumn>
<EditItemTemplate>
<asp: DropDownList runat="server" id="edit_status">
<asp: ListItem>ACTIVE</asp: ListItem>
<asp: ListItem>PENDING</asp: ListItem>
</asp: DropDownList>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:ButtonColumn ButtonType="PushButton" CommandName="Delete" Text="Delete"></asp:ButtonColumn>
</Columns>
</asp: DataGrid>

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Error msg while i pressed [edit] or [delete] button in datagrid.
----------------------------------------------------------------------------------------------
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.
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Question by:kengkit
  • 4
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7 Comments
 
LVL 6

Expert Comment

by:sara110
Comment Utility
Can you post your sub routine for delete and Edit command?
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Author Comment

by:kengkit
Comment Utility
   Sub MyDataGrid_Edit(ByVal Sender As Object, ByVal E As DataGridCommandEventArgs)

        MyDataGrid.EditItemIndex = CInt(E.Item.ItemIndex)
        BindGrid()

    End Sub
-----------------------------------------------------------------------------------------------------
    Sub MyDataGrid_Delete(ByVal s As Object, ByVal e As DataGridCommandEventArgs)

        Dim UID As String
        Dim success As Boolean


        UID = MyDataGrid.DataKeys(e.Item.ItemIndex)

        If UID = "U100001" Then
            log.MessageBox("Access Denied! This is administrator account!")
            Exit Sub
        End If

        success = log.delete_member(UID)

        If success = True Then
            log.MessageBox("Record Deleted")
        Else
            log.MessageBox("Error")
        End If

        BindGrid()

    End Sub
0
 
LVL 6

Expert Comment

by:sara110
Comment Utility
in this line in Edit :  MyDataGrid.EditItemIndex = CInt(E.Item.ItemIndex)      is your item Numeric String? or integer?

for this line

MyDataGrid.DataKeys(e.Item.ItemIndex)  change it to       myDataGrid.DataKeys.Item( e.Item.ItemIndex )

and about your BindGrid(),  it seems that your data contains something which is invalid for textboxes
set the  EnableEventValidation="false"  to false     and add it to your page directive

I mean the problem appear when you select data from database to fillout your textboxes by your data in edit command

this is a very easy sample which works with sql

<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>

<Script Runat="Server">
  Sub Page_Load( s As Object, e As EventArgs )
    If Not isPostBack Then
      BindData
    End If
  End Sub

  Sub BindData
    Dim myConnection As SQLConnection
    Dim myCommand As SQLCommand
    myConnection = New SQLConnection( "Server=Localhost;uid=sa;pwd=;Database=Northwind" )
    myCommand = New SQLCommand( _
      "Select * from Products", myConnection )
    myConnection.Open()
    myDataGrid.DataSource = myCommand.ExecuteReader()
    myDataGrid.DataBind()
    myConnection.Close()
  End Sub

  Sub editProduct( s As Object, e As DataGridCommandEventArgs )
    myDataGrid.EditItemIndex = e.Item.ItemIndex
    BindData
  End Sub

  Sub cancelEdit( s As Object, e As DataGridCommandEventArgs )
    myDataGrid.EditItemIndex = -1
    BindData
  End Sub

  Sub updateProduct( s As Object, e As DataGridCommandEventArgs )

    ' Get New Values
    Dim productName As TextBox
    productName = e.Item.Cells( 2 ).Controls( 0 )
    Dim unitPrice As TextBox
    unitPrice = e.Item.Cells( 3 ).Controls( 0 )

    ' Update Database
    Dim myConnection As SqlConnection
    Dim myCommand As SqlCommand
    Dim sqlString As String

    myConnection = New SqlConnection( "Server=Localhost;uid=sa;pwd=hosnieh60;Database=Northwind" )
    sqlString = "Update Products Set ProductName = " & _
      "@productName, UnitPrice=@unitPrice Where ProductID= @productID"
    myCommand = New SQLCommand( sqlString, myConnection )
    myCommand.Parameters.Add( _
      New SQLParameter( "@ProductName", SqlDbType.NVarChar, 80 ))
    myCommand.Parameters( "@ProductName" ).Value = productName.Text
    myCommand.Parameters.Add( _
      New SQLParameter( "@unitprice", SqlDbType.Money ))
    myCommand.Parameters( "@unitPrice" ).Value =  _
      cType( unitPrice.Text, Decimal )
    myCommand.Parameters.Add(New SQLParameter( "@productID", SqlDbType.INT ))
    myCommand.Parameters( "@productID" ).Value = myDataGrid.DataKeys.Item( e.Item.ItemIndex )
    myConnection.Open()
    myCommand.ExecuteNonQuery
    myConnection.Close()
    myDataGrid.EditItemIndex = -1
    BindData
  End Sub
</Script>

<html>
<head><title>DataGrid</title></head>
<body>

<form Runat="Server">

<asp:DataGrid
  id="myDataGrid"
  cellpadding=3
  AutoGenerateColumns="False"
  DataKeyField="ProductID"
  OnEditCommand="editProduct"
  OnCancelCommand="cancelEdit"
  OnUpdateCommand="updateProduct"
  Runat="Server">
  <Columns>
    <asp:EditCommandColumn
      EditText="Edit"
      CancelText="Cancel"
      UpdateText="Update" />
    <asp:BoundColumn HeaderText="Product ID"
      DataField="ProductID" ReadOnly="True"/>
    <asp:BoundColumn HeaderText="Product Name"
      DataField="ProductName" />
    <asp:BoundColumn HeaderText="Price"
      DataField="UnitPrice" DataFormatString="{0:c}" />
  </Columns>
</asp:DataGrid>

</form>

</body>
</html>


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Author Comment

by:kengkit
Comment Utility
1) There is nothing happen when i press [edit button] if i add [EnableEventValidation="false"]
2) Please note tat everything go fine, display properly in my datagrid until i press [edit] or [delete] button
3) Please note tat the edit button is use for update value of [dropdownlist] in my datagrid, and the value of [dropdownlist] is return by [databind]

<%@ Page Language="VB" EnableEventValidation="false" AutoEventWireup="false" CodeFile="member_control.aspx.vb" Inherits="member_control" %>
<html>
<head>
    <title>Search Member</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
         <asp:DataGrid ID="MyDataGrid" runat="server"
            AutoGenerateColumns="false"
            OnUpdateCommand="MyDataGrid_Update"
            OnCancelCommand="MyDataGrid_Cancel"
            OnEditCommand="MyDataGrid_Edit"
            OnPageIndexChanged="MyDataGrid_PageIndexChanged"
            OnDeleteCommand="MyDataGrid_Delete"
            DataKeyField="UID"
            CellPadding="3">
            <HeaderStyle BackColor="InactiveCaptionText" Font-Bold="True" />
            <Columns>
                <asp:EditCommandColumn ButtonType="PushButton" CancelText="Cancel" EditText="Edit" UpdateText="Update"></asp:EditCommandColumn>
      <asp:TemplateColumn HeaderText="Status">
      <ItemTemplate>
      <asp:Label runat="server" Text='<%#Container.DataItem("status")%>' ID="Label1" />
      </ItemTemplate>
      <EditItemTemplate>
      <asp:DropDownList runat="server" id="edit_status">
            <asp:ListItem>ACTIVE</asp:ListItem>
            <asp:ListItem>PENDING</asp:ListItem>
      </asp:DropDownList>
      </EditItemTemplate>
      </asp:TemplateColumn>                
        <asp:ButtonColumn ButtonType="PushButton" CommandName="Delete" Text="Delete"></asp:ButtonColumn>
            </Columns>
        </asp:DataGrid>
    </div>
    </form>
</body>
</html>
0
 

Author Comment

by:kengkit
Comment Utility
for your convenience, I have uploaded my source code to:
http://www.aams.com.my/source.zip

pls help me to solve tis problem.. very urgent...
0
 
LVL 6

Expert Comment

by:sara110
Comment Utility
instead of EnableEventValidation="false"          :     ValidateRequest="false"  

then , just maybe when you call BidGrid()  because in sub routine it seems there is no problem.
what is your version of asp.net , is it 1.1 or 2.0 ?
0
 
LVL 6

Accepted Solution

by:
sara110 earned 80 total points
Comment Utility
by the way, in form load you use BindGrid()
do you put it in
if not page.ispostback then
BindGrid()
endif
 ??
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