Simple .NET/ASP.NET PDF document editor web control SDK

This code yields a client-side function that acts as a simple wrapper method for the invocation of the callback Here s the code that gets generated and registered in the output stream: <script type="text/javascript"> <!-function GetAddress() { WebForm_DoCallback ('__Page', documentallddlListBvalue, DisplayAddress, "context", null) } // --> </script> You re wrapping it in the GetAddress function so that you can fire the callback at will from a number of places on your form Let s examine the call to WebForm_DoCallback for a moment, and see how your call to GetCallbackEventReference created it The first parameter you passed, this, resulted in the reference to __Page as the first parameter If you were using a control, this parameter would be the ID of that control Next, your string expression resulted in a line of code that pulls the current value of list B from the interface via DHTML.

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Now if we commit in window 1, window 2 will give an error: scott@ORA10G> update emp set sal=1450 where ename='MARTIN'; * ERROR at line 1: ORA-08177: can't serialize access for this transaction If window 1 issues a rollback, though, the window 2 session s update will succeed Setting the transaction isolation level just to solve the lost update problem is usually not feasible for the following reasons: In most web applications, you grab a connection from a connection pool for each HTTP request Since the transaction isolation level is associated with a connection, you can use the previous technique only if the select that displayed the record and the update that followed are using the same exact connection.

Table 10-10 summarizes the imperative collections available in the System.Collections. Generic namespace.

Since the connection may change with each request, and since the query and the update would be performed in two separate requests, setting the transaction isolation level to solve the lost update problem simply will not work Such an environment, in which you are not maintaining the same database connection across multiple user requests, is termed a stateless environment This is not true in client/server applications where a user has a dedicated database session for the entire user interaction Such an environment is called a stateful environment Thus, setting the transaction isolation level to SERIALIZABLE is an option only in stateful environments Another important point to note is that changing the transaction isolation level has a huge impact on the way DML statements behave Most transactions require the use of the default isolation level of READ COMMITTED.

This is the value you re passing back to the server DisplayAddress is the name of the client-side function to be called when the server is done with its work It s passed as a function pointer And finally, your literal context is passed as the literal string context A null value is passed for your error callback, since you specified none In the same way that __doPostback causes a postback to occur, WebForm_DoCallback fires the out-of-band callback to the server in the background When the server returns, the DisplayAddress function pointer is invoked, and the value from the server is passed to it Let s hop over to the server-side callback event trap This is determined by the reference to the type you passed as argument one to GetCallbackEventReference It must be an instance of a type that implements ICallbackEventHandler Let s examine your implementation of this interface.

List<'a> SortedList<'a> Dictionary<'key,'value> SortedDictionary<'key,'value> Queue<'a> Stack<'a> HashSet<'a>

The third problem with this technique is that the second user has to wait until the transaction of the first user has been committed, only to get an error message asking him to retry This can be very annoying Thus, setting the transaction isolation level can be considered a solution to the lost update problem if You are working in a stateful environment (eg, in a client/server application) where a connection is maintained across multiple user requests There is already a need to use the serializable transaction due to other business requirements The number of expected simultaneous updates involving the same row(s) is fairly low This would ensure that we don't waste the end user's time by giving error messages after making him wait for a long time If the preceding criteria are not met, you need to consider the other approaches described in the next sections..

Mutable, resizable integer-indexed arrays, usually called ResizeArray<'a> in F#. Mutable, resizable lists implemented using sorted arrays. Mutable, resizable dictionaries implemented using hash tables. Mutable, resizable dictionaries implemented using sorted arrays. Mutable, first-in, first-out queues of unbounded size. Mutable, first-in, last-out stacks of unbounded size. Mutable, resizable sets implemented using hash tables. New in .NET 3.5. The F# library also defines a Microsoft. FSharp.Collections.HashSet type usable in conjunction with earlier versions of .NET.