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he goal of this chapter is twofold. The first order of business is to provide you with a highlevel overview of various security technologies the .NET base class libraries offer. You ll learn the role of strongly named assemblies, hash codes and role-based security (RBS) systems. Do understand, however, that we will not be diving into each and every detail regarding these topics. Rather, this information will give you a context for the major mission of this chapter, which we outline under the second order of business. Our second (major) task with this chapter is to address the details of securing ASP .NET web applications using Windows-based and Forms-based authentication. Once you understand the basics behind each model, you will learn how to implement Forms-based authentication under ASP .NET 2.0. As you will see, developers can use numerous new techniques (including the Membership and Roles classes, server-side security controls, and cookieless authentication) that simplify the process. We ll then wrap up the chapter by examining a (much welcomed) Web-based UI editor for web.config files.

The big challenge with sharing a list of validation rules across all instances of a business type is that those instances could be running in parallel on different threads In particular, on a web or application server, many client requests may be running simultaneously, and they all need access to that same set of cached RuleMethod objects Within the module SharedValidationRules, a Dictionary is used to cache all the rules for all the business object types: Private _managers As New Dictionary(Of Type, ValidationRulesManager)() It is indexed by Type, which is the type of the business objects used by the application Each business object type has its own ValidationRulesManager, which stores the rules for that particular business type.

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With only one available in the default installation from Sun, you don t have to explicitly request to use a specific engine. But, if multiple were available, you could explicitly request a language with the -l option. The language string to pass in would be one of those returned from the scripting engine factory s getNames() method. As Listing 9-1 showed, any of the following will work for the provided ECMAScript 1.6 engine: js, rhino, JavaScript, javascript, ECMAScript, or ecmascript. Yes, the names are case sensitive.

To safely gain access to the ValidationRulesManager object for a type, you use the GetManager() method: Friend Function GetManager(ByVal objectType As Type, _ ByVal create As Boolean) As ValidationRulesManager Dim result As ValidationRulesManager = Nothing If Not _managersTryGetValue(objectType, result) AndAlso create Then SyncLock _managers If Not _managersTryGetValue(objectType, result) Then result = New ValidationRulesManager _managersAdd(objectType, result) End If End SyncLock End If Return result End Function This method implements a simple but effective locking scheme Remember that multiple threads may be executing this code at exactly the same time, and those threads may all attempt to get a value from the Dictionary If Not _managersTryGetValue(objectType, result) AndAlso create Then If this succeeds, then there s no problem Multiple threads can read from the Dictionary at once without causing an issue.

Basically, in this code segment, this extender was associated with a TextBox control, and the Minimum and Maximum properties were set with the lower and upper bound of the permissible values for the text box. The next sample is similar except that it defines a set of values for months for the NumericUpDown control to iterate through instead of the default +/-1 increment/decrement behavior:

Things get more complex if the result field comes back as Nothing, because that means a new ValidationRulesManager must be added to the Dictionary Only one thread can be allowed to do this, so the SyncLock statement is used to ensure that only one thread can run the next bit of code at a time Note my careful choice of words: only one at a time Many threads may run the code inside the SyncLock statement, because many threads may have gotten a Nothing value in result So, the code in the SyncLock statement must ensure that only the first thread does any real work It does this by rechecking to see whether the value is in the Dictionary If Not _managersTryGetValue(objectType, result) Then result = New ValidationRulesManager _managersAdd(objectType, result) End If.

SQL> CREATE TABLE T6( 2 C1 NUMBER(10) PRIMARY KEY, 3 C2 NUMBER(10), 4 CONSTRAINT FK_T5_C1 FOREIGN KEY(C2) REFERENCES T5(C1) ENABLE); SQL> SQL> SQL> SQL> SQL> INSERT INTO INSERT INTO INSERT INTO INSERT INTO COMMIT; T6 T6 T6 T6 VALUES(1,1); VALUES(2,2); VALUES(3,3); VALUES(4,4);

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