Invalid postback or callback argument is driving me nuts!

[jason.neo]

Hi all experts,

I am going nuts with this Invalid postback or callback argument thingy
with .Net 2.0

I am building a file attachment module which relays on a Datatable
stored in session (yeah i know its unhealthy, but its the only "clean"
approach which I can think of to avoid tranfering temp files onto the
server) to maintain the list of attached files before the "commit"
action is done to transfer all the files onto the server.

I have a function which allows the user to delete the attached file
before the "commit" action is performed. Essentially, the "delete" is
deleting a row from the Datatable stored in session. When I was doing
testing of this code in the early phase, all works well, but suddenly a
few days later, when I improved the codes to incorporate other
functions, whenever I click on the "delete" button (which is a template
column with an image button that triggers a "RowCommand " to handle the
deletion) i will hit the Invalid postback error. I have since removed
those new codes but I am still stuck with the problem.

Someone help me please! I am totally clueless as how to resolve this
issue. I have tried to turn off the EnableEventVali dation at the page
level, but when I do so, my "RowCommand " event is not being triggered
(it works fine if i turn on the validation). You guys see the
fustration I am facing here?

Would really really be glad if someone could help me. I have attached
my codes below so you guys can help me take a look. Do let me know if
you need more information.

------------- Code Behind ---------------

Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArg s) Handles Me.Load
If Not IsPostBack Then
BindAttachmentG rid(True)
Else
BindAttachmentG rid(False)
End If
vldInvalidFile. Visible = False
vldLimitExceede d.Visible = False
vldDuplicate.Vi sible = False
End Sub

Private Sub BindAttachmentG rid(ByVal blnBindEmpty As Boolean)
Dim dt As DataTable
If blnBindEmpty = False Then
dt = Me.p_Attachment TempStorage <-- "this
p_AttachmentTem pStorage is a private property which will determine if
an existing DT is stored in the session, if not, it will call the
CreateAttachmen tDT" -->
End If
gdvAttachment.D ataSource = dt
gdvAttachment.D ataBind()
End Sub

Private Sub CreateAttachmen tDT()
Dim dtAttach As New DataTable
dtAttach.Column s.Add("ID", GetType(Integer ))
dtAttach.Column s.Add("FileName ", GetType(String) )
dtAttach.Column s.Add("RawFileS ize", GetType(Integer ))
dtAttach.Column s.Add("FileSize ", GetType(String) )
dtAttach.Column s.Add("Uploaded By", GetType(String) )
dtAttach.Column s.Add("Uploaded DateTime", GetType(String) )
dtAttach.Column s.Add("FileStre am",
GetType(WebCont rols.FileUpload ))
dtAttach.Column s.Add("FileType Flag", GetType(String) )
dtAttach.Column s.Add("FilePath ", GetType(String) )
dtAttach.Primar yKey = New DataColumn() {dtAttach.Colum ns("ID")}
Me.p_Attachment TempStorage = dtAttach
End Sub

Protected Sub btnAttach_Click (ByVal sender As Object, ByVal e As
System.EventArg s) Handles btnAttach.Click
If fileAttach.HasF ile = True Then
Dim tmpTotalSize As Double = Me.p_TotalUploa dedSize <--
"all Me.p_XXXX are simply private property which stores information in
viewstate" -->
tmpTotalSize += fileAttach.Post edFile.ContentL ength
If tmpTotalSize 10485760 Then
vldLimitExceede d.Visible = True
Exit Sub
End If
If Me.p_AllowDupli cation = False Then
For Each dRowItem As DataRow In
Me.p_Attachment TempStorage.Row s
If dRowItem("FileN ame").ToString. Trim =
fileAttach.File Name Then
vldDuplicate.Vi sible = True
Exit Sub
End If
Next
End If
Dim dRow As DataRow
Me.p_TotalUploa dedSize +=
fileAttach.Post edFile.ContentL ength
dRow = Me.p_Attachment TempStorage.New Row()
Me.p_Attachment ID += 1
dRow("ID") = Me.p_Attachment ID
dRow("FileName" ) = fileAttach.File Name
dRow("RawFileSi ze") = fileAttach.Post edFile.ContentL ength
dRow("FileSize" ) =
ConvertFileSize (fileAttach.Pos tedFile.Content Length)
dRow("UploadedB y") =
clsUser.getUser Name(clsUser.ge tEmployeeIDByLo ginID(MyBase.Ge tLogonUser()))
dRow("UploadedD ateTime") = Format(Now,
clsUtil.ConfigV alue("dateTimeF ormat"))
dRow("FileStrea m") = fileAttach
dRow("FileTypeF lag") = "New"
dRow("FilePath" ) = ""
Me.p_Attachment TempStorage.Row s.Add(dRow)
Me.p_Attachment TempStorage.Acc eptChanges()
If gdvAttachment.P ageCount <0 Then
gdvAttachment.P ageIndex = gdvAttachment.P ageCount
End If
BindAttachmentG rid(False)
Else
vldInvalidFile. Visible = True
End If

End Sub

Protected Sub gdvAttachment_R owDataBound(ByV al sender As Object,
ByVal e As System.Web.UI.W ebControls.Grid ViewRowEventArg s) Handles
gdvAttachment.R owDataBound
If e.Row.RowType = DataControlRowT ype.Header Then
e.Row.Cells(2). Text = "Size <br>(" &
ConvertFileSize (Me.p_TotalUplo adedSize) & " Total)"
ElseIf e.Row.RowType = DataControlRowT ype.DataRow Then
Dim lBtnFileName As LinkButton =
CType(e.Row.Fin dControl("lBtnF ileName"), LinkButton)
lBtnFileName.Co mmandArgument = e.Row.DataItem( "ID")
AddHandler lBtnFileName.Cl ick, AddressOf lBtnFileName_Cl ick
CType(e.Row.Fin dControl("btnAt tachmentDelete" ),
ImageButton).At tributes.Add("o nclick", "return confirm('Are you sure
you want to delete " & e.Row.DataItem( "FileName") & "?')")
CType(e.Row.Fin dControl("btnAt tachmentDelete" ),
ImageButton).Co mmandArgument = e.Row.DataItem( "ID")
End If
End Sub

<-- "The following code suppose to be the one to handle the delete
event, but before this code is even run, I hit the above error
already!" -->
Protected Sub gdvAttachment_R owCommand(ByVal sender As Object,
ByVal e As System.Web.UI.W ebControls.Grid ViewCommandEven tArgs) Handles
gdvAttachment.R owCommand
If e.CommandName = "CustomDele te" Then
Try
Dim dRow As DataRow =
Me.p_Attachment TempStorage.Row s.Find(e.Comman dArgument)
If dRow("FileTypeF lag") = "Existing" Then
If System.IO.File. Exists(dRow("Fi lePath")) = True
Then
System.IO.File. Delete(dRow("Fi lePath"))
End If
End If
Me.p_TotalUploa dedSize -= dRow("RawFileSi ze")
Me.p_Attachment TempStorage.Row s.Remove(dRow)
BindAttachmentG rid(False)
Catch ex As Exception
Throw New Exception(ex.Me ssage)
End Try
End If
End Sub

By the way, the above codes are in a UserControl and the control is
place inside a plain aspx page.

Regards,
Jason

[jason]

Hello all.

Upon further research, I found my error was caused by the "Delete"
image button which resides in the template column of my gridview.

If i use a standard command button it works. But I need to use the
image button of coporate standard requirement!

Anyone have any idea how can i resolve this image button with grid view
problem?

I search the groups and found another thread start whom encounter the
same problem as me, including the fact when we disable the
"EnableEventVal idation" function, the event for the RowCommand is not
triggering. Regretfully no one answered him.

Any idea anyone?

[merco]

i have the same problem...
some news ???

jason wrote:

Hello all.

Upon further research, I found my error was caused by the "Delete"
image button which resides in the template column of my gridview.

If i use a standard command button it works. But I need to use the
image button of coporate standard requirement!

Anyone have any idea how can i resolve this image button with grid view
problem?

I search the groups and found another thread start whom encounter the
same problem as me, including the fact when we disable the
"EnableEventVal idation" function, the event for the RowCommand is not
triggering. Regretfully no one answered him.

Any idea anyone?

[jason]

hello any help anyone?

[droyad]

Just had the same problem. Found that I shouldn't do a DataBind() on
the LoadEvent. More details on my Blog (Shameless plug):
http://droyad.blogspot.com/2006/12/i...-argument.html

jason wrote:

hello any help anyone?

[droyad]

Just had the same problem. Found that I shouldn't do a DataBind() on
the LoadEvent. More details on my Blog (Shameless plug):
http://droyad.blogspot.com/2006/12/i...-argument.html

merco wrote:

i have the same problem...
some news ???

jason wrote:

Hello all.

Upon further research, I found my error was caused by the "Delete"
image button which resides in the template column of my gridview.

If i use a standard command button it works. But I need to use the
image button of coporate standard requirement!

Anyone have any idea how can i resolve this image button with grid view
problem?

I search the groups and found another thread start whom encounter the
same problem as me, including the fact when we disable the
"EnableEventVal idation" function, the event for the RowCommand is not
triggering. Regretfully no one answered him.

Any idea anyone?