I am trying to update a SQLite database table with values selected from comboboxes in VB.Net.

The first part of the query works, but if I include a where statement I get the following error : 'SQL logic error
near "Where": syntax error'

I have tried .selected text, but the error persists. What am I missing ?

Code:
Dim opdragKopersWatBotteleer As New SQLiteCommand

        opdragKopersWatBotteleer.Connection = konneksie
        opdragKopersWatBotteleer.CommandText = " Update Verkope " &
                                               "set Gebottel = ( '" & BottelComboBox.SelectedItem & " '  " &
                                               "Where verkope.DebiteurNaam = '" & KoperComboBox.SelectedItem & "' )"


        opdragKopersWatBotteleer.ExecuteNonQuery()





Regards