The FindTask object is used to search one or more layers in a very similar fashion to how a database is searched using an SQL statement. For example, a database is searched using an SQL statement with a WHERE clause, like this:
USE MyDatabase;
GO
SELECT Name, ProductNumber, ListPrice AS Price
FROM Production.Product
WHERE ProductLine = 'R'
AND DaysToManufacture < 4
ORDER BY Name ASC;
GOThe FindTask constructor works with a single WHERE clause against these layers using a text literal. QueryTask, on the other hand, can use multiple fields and field types against a single layer. However, it goes beyond that with QueryTask. The QueryTask class can also be used for spatial queries. For example, you can also execute a query that states "find a parking meter that is on Baker Street and within 500 meters of a grocery store." In effect, QueryTask is a tool for doing spatial analysis. As such, this feature makes it a very powerful tool. Lastly, IdentifyTask is...