concurrency violation: The updatecommand affected 0 of the expected 1

[dkotoupas]

im using a sqldataadapter, dataset and bindingsource to connect to a table. i retrieve all records from the database and i change the data on a field then update changes to database. when i try to change back to original value i get a Concurrency violation error (concurrency violation: The updatecommand affected 0 of the expected 1). this is the code:

Try
            Me.Validate()
            Me.sqlBindingSource.EndEdit()
 
            Dim slqCmdBuilder As New SqlCommandBuilder(sqlAdapter)
 
            Me.sqlAdapter.Update(Me.sqlDs.Tables("Items"))
 
            slqCmdBuilder.Dispose()
            slqCmdBuilder = Nothing
 
            Me.sqlBindingSource.ResetBindings(True)
 
Catch ex As Exception
            MessageBox.Show(ex.Message, "Ειδοποίηση", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try

can anyone help me plz?