asked on

problem when i using edit / delete button in datagrid

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.
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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.

sara110

Can you post your sub routine for delete and Edit command?

kengkit

ASKER

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

sara110

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>

kengkit

ASKER

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>

kengkit

ASKER

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...

sara110

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 ?

ASKER CERTIFIED SOLUTION

sara110

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