Dynamic Editable Collection in C#.net

Access pdf417 in C#.net Dynamic Editable Collection

Note An example of this outside the database sphere is the trap I fell into with the neighbor boy s bicycle. (See

row fields, change pt.VisibleFields to pt.RowFields, and to show report filter fields, change pt.RowFields to pt.PageFields.

The first thing you ll notice is that this diagram is virtually identical to the state server diagram discussed earlier, and it turns out that the basic model and benefits are indeed consistent with that approach. The application gains scalability and fault tolerance because you can implement a web farm, whereby the web server that s handling each page request retrieves state from the central database. Once the page request is complete, the data is stored in the central state database. Using clustering technology, you can make the database server itself fault tolerant, thereby minimizing it as a single point of failure.

A thread can be in one of several states, as shown in Table 12-3. Note that the Background state is not mutually exclusive to the other states. It s possible for a thread to be a background thread and to be running, for example. Both of these states can be discovered by consulting the ThreadState property of a thread. Table 12-3. Execution States of System.Threading.ThreadState

It is important to realize that a physical service-oriented architecture is not the same as an n-tier architecture. In fact, the two concepts can be complementary. It is also important to know that the concept of a logical n-layer architecture is the same in SOA as in any other type of application model. In logical n-layer models, a service should have the same layers as any other application: Interface, Business, and Data. In a logical n-layer model, the Interface layer consists of XML messages, but that s not a lot different from the HTML used in a web-based Interface layer. The Business layer is much the same as in any other application; it contains the business logic and behaviors that make the service useful. The data layer is also much the same as in any other application, in that it stores and retrieves data as necessary. However, the physical n-tier model might not appear to translate to the SOA world at all. Some people would say that SOA makes n-tier concepts totally obsolete, but I disagree. SOA has an important set of goals around loose coupling, reuse of functionality, and open communication. An n-tier client/ server architecture has a complementary set of goals around performance, avoiding duplication of code, and targeted functionality. The reality is that both models are useful, and they complement each other.

The method used to disable the capturing of session activity to a trace file depends on the method used to enable the trace. The different methods follow: SQL> ALTER SESSION SET EVENTS "10046 TRACE NAME CONTEXT OFF"; -orSQL> EXEC DBMS_SESSION.SESSION_TRACE_DISABLE -orSQL> EXEC SYS.DBMS_SYSTEM.SET_EV(SID, SERIAL#, 10046, 0, "") -orSQL> EXEC SYS.DBMS_SUPPORT.STOP_TRACE_IN_SESSION(SID, SERIAL#) -orSQL> EXEC DBMS_MONITOR.SESSION_TRACE_DISABLE(SESSION_ID=>SID, SERIAL_NUM=>SERIAL#) -orSQL> EXEC SYS.DBMS_SYSTEM.SET_SQL_TRACE_IN_SESSION(SID, SERIAL#, FALSE)