>Naomi, I believe you want to look at Decimal.Parse and Int.Parse.
>

UPDATE. Disregard, I think I see the problem now.

Mike, thanks a lot. I got a new error and I think I'm going to go crazy with this.

:(((((((

 /// <summary>
        /// Format the Order Items grid.
        /// </summary>
        /// <param name="dt"></param>
        private void FormatOrderItemsGrid(OrderDetailsDS.OrderDetailsDataTable dt)
        {
            if (_gridStyleItem == null)
            {
                _gridStyleItem = new DataGridTableStyle();
                this.grdOrderItems.TableStyles.Add(_gridStyleItem);
                this.grdOrderItems.TableStyles[0].MappingName = dt.TableName;
                //this.Width = 220;
                //this.grdOrderItems.Width = 220;

                //Order No column

                DataGridCustomTextBoxColumn colQuantity = new DataGridCustomTextBoxColumn();
                colQuantity.Owner = this.grdOrderItems;
                colQuantity.HeaderText = "Qty";
                colQuantity.MappingName = "Qty";
                colQuantity.Width = ((this.grdOrderItems.Width * 10) / 100);
                colQuantity.Alignment = HorizontalAlignment.Center;

                //Order Item Column
                DataGridCustomTextBoxColumn colManPartNo = new DataGridCustomTextBoxColumn();
                colManPartNo.Owner = this.grdOrderItems;
                colManPartNo.HeaderText = "Item No";
                colManPartNo.MappingName = "itemNo";
                colManPartNo.Width = ((this.grdOrderItems.Width * 20) / 100);
                colManPartNo.Alignment = HorizontalAlignment.Left;

                // Unfortunately the Description column is not in OrderDetails table
                //Order Item Description
                DataGridCustomTextBoxColumn colDescription = new DataGridCustomTextBoxColumn();
                colDescription.Owner = this.grdOrderItems;
                colDescription.HeaderText = "Description";
                colDescription.MappingName = "Description";
                colDescription.Width = ((this.grdOrderItems.Width * 50) / 100);
                colDescription.Alignment = HorizontalAlignment.Left;
                
                //Order Item Price
                DataGridCustomTextBoxColumn colPrice = new DataGridCustomTextBoxColumn();
                colPrice.Owner = this.grdOrderItems;
                colPrice.HeaderText = "Price";
                colPrice.MappingName = "Price";
                colPrice.Width = ((this.grdOrderItems.Width * 24) / 100);
                colPrice.Alignment = HorizontalAlignment.Right;
                // Setup table mapping name

                //Order Item Total Price
                DataGridCustomTextBoxColumn colTotalPrice = new DataGridCustomTextBoxColumn();
                colPrice.Owner = this.grdOrderItems;
                colPrice.HeaderText = "Total";
                colPrice.MappingName = "TotalPrice";
                colPrice.Width = ((this.grdOrderItems.Width * 24) / 100);
                colPrice.Alignment = HorizontalAlignment.Right;

                // Setup table mapping name
                this.grdOrderItems.TableStyles[0].GridColumnStyles.Add(colManPartNo);
                this.grdOrderItems.TableStyles[0].GridColumnStyles.Add(colDescription);
                this.grdOrderItems.TableStyles[0].GridColumnStyles.Add(colQuantity);
                this.grdOrderItems.TableStyles[0].GridColumnStyles.Add(colPrice);
                this.grdOrderItems.TableStyles[0].GridColumnStyles.Add(colTotalPrice);
                this.grdOrderItems.RowHeadersVisible = false;
            }
            this.grdOrderItems.DataSource = dt;
            this.grdOrderItems.Refresh();
        }

The description and TotalPrice I added as virtual columns to my DS. Now I'm getting some weird errors in this code. Do you see what may be wrong or I can not add "virtual" columns to my grid?

Thanks a lot again.