error when commiting the row to the original data store(urgent)

[cutequencher]

i am having this error when i am about to delete a data row

inline with this is a message box saying:
object reference not set to an instance of an object. do you want to correct the value?

if i click yes, it will delete the row if no it will ignore the deletion

i've already checked all of my declarations and pretty sure that i've declared everything right. please help me about this. thanx!

[Killer42]

A "data row" in what? And using what version of VB?

[cutequencher]

sorry for the late response.

here's my code:

Private Sub delCol_ButtonCo lumnClick(ByVal sender As Object, ByVal e As Leadit.Extended DataGrid.Button ColumnEventArgs ) Handles delCol.ButtonCo lumnClick
Dim row As Integer
Dim hourdiffBtn As Integer
Dim sBtn As DateTime
Dim eBtn As DateTime
Dim res As MsgBoxResult
row = Me.dtgCustomSch ed.CurrentRowIn dex
res = MsgBox("Are you sure you want to delete the schedule on " + Me.dtgCustomSch ed.Item(row, 0), MsgBoxStyle.Yes No)
If res = MsgBoxResult.Ye s Then
sBtn = Date.Parse(Me.d tgCustomSched.I tem(row, 1))
eBtn = Date.Parse(Me.d tgCustomSched.I tem(row, 2))
hourdiffBtn = getHrValue(sBtn , eBtn)
lastRowNumber = lastRowNumber - 1
Me.remainingHou r2 = Me.remainingHou r2 + hourdiffBtn
Me.txtLookUpHou rs.Text = remainingHour2. ToString
addSchedule.Tab le("ttcpcustomi zedschedule").R ows.R emoveAt(row)

Else
Exit Sub
End If
End Sub


dtgcustomsched is the name of my datagrid
addsched is the name of the dataset

i made one of the datagrid cell as a customized button.. it already work fine with my other codes.. the problem only occur here

the error occurs on the line in bold.

also, this error only appears when i delete the last row on the datagrid, but if i delete anything rather than the last row everything works fine and no error is being detected

please help. thanx!

i am using vb.net 2002

[Motoma]

also, this error only appears when i delete the last row on the datagrid, but if i delete anything rather than the last row everything works fine and no error is being detected

Not knowing anything about VB.NET (other than the .NET framework) it sounds like you have an indexing issue. That is to say, you are trying to remove a row outside the boundaries of the dataset. Try deleting the first row. Does the proper row get removed, or are you off by one?

[SkinHead]

Are the two indexes zero-based

row = Me.dtgCustomSch ed.CurrentRowIn dex
.
.
.
addSchedule.Tab le("ttcpcustomi zedschedule").R ows.RemoveAt(ro w)

If they have different bases, then you might need to do the following :

row = Me.dtgCustomSch ed.CurrentRowIn dex - 1

Or

addSchedule.Tab le("ttcpcustomi zedschedule").R ows.RemoveAt(ro w + 1)