cross tab in vb.net on an access database

I want to obtain a cross tab in vb.net on an access database.

I have got this from the internet

I don't understand how it woks.

Help

TRANSFORM Sum(IIf([FieldName]="Qty",[Quantity],[Quantity]*[Order Details]![UnitPrice])) AS TheValue
 SELECT Products.ProductName
 FROM tblXtabColumns, Products INNER JOIN (Orders INNER JOIN [Order Details]
 ON Orders.OrderID = [Order Details].OrderID) ON Products.ProductID = [Order Details].ProductID
 WHERE (Orders.OrderDate Between #1/1/1998# And #3/31/1998#)
 GROUP BY Products.ProductName
 PIVOT [FieldName] & Month([OrderDate]);