Queries that use the source type

- For LINQ query to compile successfully,…the type of variables used in the query…must be compatible with the types of the source elements…and or the properties of the elements.…When you execute a query, the variable used…in the foreach statement, must also be compatible…with the source data and the LINQ query variables.…In this example query,…there are no transformations to the data.…All it does is take a subset from the source…and returns that subset.…There are three pieces in this query…that lead to no transformation in the resulting sequence.…

First the type of the source, in this case,…a list of customer objects, determines the type…for the range variable cust in the query.…Therefore, the type for the range variable…is the customer object.…Second, the data type of the resulting sequence…determines the type of the query variable.…In this case, the select class…asks to return their customer elements…that satisfy the query above it.…In this case, the customers that reside in Oregon…make up the resulting sequence.…