Can't understand why code saying column doesn't belong to DataTable

  • Thread starter Thread starter Ronald S. Cook
  • Start date Start date
R

Ronald S. Cook

In the code below, I get a runtime error where indicated. The error is:

"Column 'TICKETNO' does not belong to table TICKET_DEDUCTIONS."

If I put a breakpoint on that line (so not yet executed) and type
?dedrow(c), It says basically the same thing:

Run-time exception thrown : System.ArgumentException - Column 'TICKETNO'
does not belong to table TICKET_DEDUCTIONS.

But if I type ?dedrow. the intellisense does show that TICKETNO is a
property.

Does anything jump out at anybody as being blatantly wrong?

Thanks,
Ron

Here is the code:

For Each dedrow In dsdeductions.TICKET_DEDUCTIONS
If dedrow(7, DataRowVersion.Original) = drow.cntID Then
If dedrow.RowState <> DataRowState.Added Then
ndedrow = DsPurchaseReceiver1.TICKET_DEDUCTIONS.NewRow
For Each c In DsPurchaseReceiver1.TICKET_DEDUCTIONS.Columns
If c.ColumnName <> "cntID" Then
ndedrow(c) = dedrow(c, DataRowVersion.Original) <<<---- ERRORS
HERE
End If
Next
ndedrow.RecDetailsID = ndrow.cntID
DsPurchaseReceiver1.TICKET_DEDUCTIONS.AddTICKET_DEDUCTIONSRow(ndedrow)
End If
End If
Next
 
First, you need to turn Option Strict On if you don't already have it
turned on. The reason I think you don't is because of this loop:
For Each c In DsPurchaseReceiver1.TICKET_DEDUCTIONS.Columns

Next
Click to expand...

What is "c" ? If it's a column in
DSPurchaseReceiver1.Ticket_Deductions.Columns, it should be defined as
such. Is it defined elsewhere in the program?

You can set OptionStrictOn at the top of your routine, but it's recommended
in VB that you set it in the default project properties and always use it.
This keeps you from having weird problems where VB is trying to guess what
type to convert to in order to use a variable that is not defined
correctly.

Try it and see what problems it reveals.

For example, is dedrow(7) the same data type as drow.cntID?
If dedrow(7, DataRowVersion.Original) = drow.cntID Then
Click to expand...

I can't tell what type some of your variables are, so if you re-post,
please be more generous in your information, as that might be what's
causing your problem.

I tried your method using Northwind, and it works fine, as displayed here.

Dim ds As NorthwindDataSet = New NorthwindDataSet()
Dim custAdapter As CustomersTableAdapter = New CustomersTableAdapter()
custAdapter.Fill(ds.Customers)

Dim rw As NorthwindDataSet.CustomersRow = _
DirectCast(ds.Customers.Rows(0), NorthwindDataSet.CustomersRow)
'change one value
rw.PostalCode = "9999"
'verify that it's got it
Console.WriteLine("rw.DataRowVersion.Original = {0}, " & _
" rw.DataRowVersion.Current = {1}", _
rw.Item("PostalCode", DataRowVersion.Original), _
rw.Item("PostalCode", DataRowVersion.Current))

'move the data from rw to nrw.
Dim nrw As NorthwindDataSet.CustomersRow = _
DirectCast(ds.Customers.NewRow(), NorthwindDataSet.CustomersRow)

For Each c As DataColumn In ds.Customers.Columns
nrw(c) = rw(c, DataRowVersion.Original)
Next

'show the new value in the old column
' and the proposed value in the nrw row
For Each c As DataColumn In ds.Customers.Columns
Console.WriteLine("rw." & c.ColumnName & " = " & _
rw(c, DataRowVersion.Current).ToString & _
" nrw = " & nrw.Item(c, DataRowVersion.Proposed).ToString)
Next


Robin S.
Ts'i mahnu uterna ot twan ot geifur hingts uto.
-----------------------------------------------
 
Have you tried to "Clean Solution" before rebuilding it?
If you are using the Express Edition IDE: delete the "obj" subdirectory
within each project's directory of the solution before rebuilding it.
 
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