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It will be true only for an element whose value is greater than zero This expression will be evaluated for every n in nums when the query executes Only those values that satisfy this condition will be obtained In other words, a where clause acts as a filter on the data source, allowing only certain items through All queries end with either a select clause or a group clause This example employs the select clause It specifies precisely what is obtained by the query For simple queries, such as the one in this example, the range value is selected Therefore, it returns those integers from nums that satisfy the where clause In more sophisticated situations, it is possible to finely tune what is selected For example, when querying a mailing list, you might return just the last name of each recipient, rather than the entire address Notice that the select clause ends with a semicolon Because select ends a query, it ends the statement and requires a semicolon Notice, however, that the other clauses in the query do not end with a semicolon At this point, a query variable called posNums has been created, but no results have been obtained It is important to understand that a query simply defines a set of rules It is not until the query is executed that results are obtained Furthermore, the same query can be executed two or more times, with the possibility of differing results if the underlying data source changes between executions Therefore, simply declaring the query posNums does not mean that it contains the results of the query To execute the query, the program uses the foreach loop shown here:

foreach(int i in posNums) ConsoleWriteLine(i + " ");

Notice that posNums is specified as the collection being iterated over When the foreach executes, the rules defined by the query specified by posNums are executed With each pass through the loop, the next element returned by the query is obtained The process ends when there are no more elements to retrieve In this case, the type of the iteration variable i is explicitly specified as int because this is the type of the elements retrieved by the query Explicitly specifying the type of the iteration variable is fine in this situation, since it is easy to know the type of the value selected by the query However, in more complicated situations, it will be easier (or in some cases, necessary) to implicitly specify the type of the iteration variable by using var

As you can see, the properties Count and Str are set via object initializer expressions The output is the same as that produced by the program in 8 and is shown here:

.

As explained in 8, the object initializer syntax is most useful when working with anonymous types generated by a LINQ expression In most other cases, you will use the normal constructor syntax

Properties have some important restrictions First, because a property does not define a storage location, it cannot be passed as a ref or out parameter to a method Second, you cannot overload a property (You can have two different properties that both access the same variable, but this would be unusual) Finally, a property should not alter the state of the underlying variable when the get accessor is called Although this rule is not enforced by the compiler, violating it is semantically wrong A get operation should be nonintrusive

By default, the set and get accessors have the same accessibility as the indexer or property of which they are a part For example, if the property is declared public, then by default the get and set accessors are also public It is possible, however, to give set or get its own access modifier, such as private In all cases, the access modifier for an accessor must be more restrictive than the access specification of its property or indexer There are a number of reasons why you may want to restrict the accessibility of an accessor For example, you might want to let anyone obtain the value of a property, but allow only members of its class to set the property To do this, declare the set accessor as private For example, here is a property called MyProp that has its set accessor specified as private