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.NET/Java PDF, Tiff, Barcode SDK LibraryAnd the state maintenance done across postbacks that cannot be accomplished with standard HTTP Post elements uses an HTML hidden input named ViewState So while there s no support for executing NET code within the browser, nothing from your browser bag of tricks is taken away from you when you re using the Framework Additionally, there s generally some NET code you can leverage server side that supports using standard browser features In this chapter we ll first examine ViewState closely Most Web Form developers are familiar with this hidden input, and almost all love and take advantage of the state maintenance features it affords them Here, we ll take a closer look at exactly how ViewState works, some performance impacts to be aware of, enhancements that have been added in version 20, and advanced strategies for leveraging and managing it. excel barcode formula, barcode in excel 2010, how to make barcodes in excel 2010, barcode in excel 2007, how to print barcodes in excel 2010, how do i print barcodes in excel 2010, barcode add in excel 2013, excel barcode schriftart, barcode in excel free download, barcode font for excel 2013 free,And finally, to close the pooled connection (thus releasing the actual physical connection), we can use the close() method on the pooled connection: pooledConnection.close(); InputUtil.waitTillUserHitsEnter("Done closing pooled connection"); }// end of main }// end of program Before running the program, I made sure that there was no one connected to my test database. In one session, I connected to my database as SYS user. Then I ran the preceding program and ran the query discussed earlier to list connections as SYS after each of the pauses we introduced. Table 14-1 lists the steps and the query results. Table 14-1. Results of Running a Query That Detects Connections After Each Pause in the Program DemoConnectionPooling LPWStr)>]StringBuilder sb, int sz); In this case, the MarshalAs attribute indicates that the string should be marshalled as LPWSTR rather than LPSTR.. PROGRAM SERVER SERVER_PID USERNAME ---------------- --------------- -------JDBC Thin Client DEDICATED 22326 SCOTT PROGRAM SERVER SERVER_PID USERNAME ---------------- --------------- -------JDBC Thin Client DEDICATED 22326 SCOTT In the latter half of the chapter, we ll take a look at using JavaScript in your ASP NET application Whether you re shipping static script files to the browser or dynamically generating script code from your Web Forms, we ll show you how the Framework supports and aids these efforts We ll also take a look at the new capability of ASP NET 20 to do asynchronous out-ofband callbacks to the server via script, making the highly coveted partial page refresh easily attainable in a variety of contexts.. A physical connection is created. The physical connection is checked out as a logical connection. The physical connection remains. The physical connection is closed. Another important data type that often should be passed to native code is a function pointer Function pointers are widely used to implement callbacks and provide a simple form of functional programming; think for instance of a sort function that receives as input the pointer to the comparison function Graphical toolkits have widely used this data type to implement event-driven programming, and they often have to pass a function that will be invoked by another one PInvoke is able to marshal delegates as function pointers, and again the runtime is responsible for generating a suitable function pointer callable from native code When the marshalled function pointer is invoked, a stub is called, and the activation record on the stack is rearranged to be compatible with the calling convention of the runtime Then the delegate function is invoked. PROGRAM SERVER SERVER_PID USERNAME ---------------- --------------- -------JDBC Thin Client DEDICATED 22326 SCOTT No rows selected Here is a typical simple architecture for a smaller application with a single data store that s not expecting hundreds of concurrent users (see Figure 1-2). All of the components are managed types. The ASP .NET pages use standard controls built into the Framework that generate W3C-compliant HTML. This allows the application to be deployed to any platform or operating system that supports a web browser. The pages use what could be a stateful business object layer, but the application is simple enough that only a few of these stateful types are actually needed. The business object layer, in turn, leverages a data access layer written using the Data Access Application Block and calling SQL Server stored procedures.
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