Hi Bonnie. Many thanks for your reply.
That sorted the problem but I dont understand why !!

OleDbDataAdapter oAd = new OleDbDataAdapter(this.sSelectString ,oCon);
replaced by
this.oAd = new OleDbDataAdapter(this.sSelectString ,oCon);

Why is there a difference then between the two commands ?
Are they both not initialising a New OleDbDataAdapter called oAd ?

Regards,

Gerard