Error Delete Datacolumn of a Datatable

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Hello !

VS2005 SP1

I have a problem to remove a datacolumn of a datatable:

Dim dsXML As New DataSet
dsXML.ReadXmlSchema("C:\forecast.xsd")
dsXML.ReadXml("C:\forecast.xml")
Me.DataGridView1.DataSource = dsXML.Tables(0)

' dsXML.Tables(0).Columns.Remove("PLANT")
' dsXML.Tables(0).AcceptChanges()

MessageBox.Show("ok")
For Each drH As DataRow In dsXML.Tables(0).Rows
drH.Item("Material") = drH.Item("Material") & "ABC"
Next

If I let execute these 2 locs

dsXML.Tables(0).Columns.Remove("PLANT")
dsXML.Tables(0).AcceptChanges()

I get an error at

drH.Item("Material") = drH.Item("Material") & "ABC"

NullReferenceException
Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.

Do you have any idea?

Thanks
aaapaul

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