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Essay on Multithreading in Visual Basic.NET
Multithreading refers to the ability of a single program to execute different processes concurrently. It's a way of speeding up response when you know that one part of a program takes a long time to run but the rest of the program can be executing without waiting for the result. This is a new feature that is mainly provided by the new CLR runtime (the default remains single threading), and there are new VB.NET language elements that must be used to implement it.
Multithreading gives programs the ability to do several things at a time. Each stream of execution is called a thread. Multithreading is used to divide lengthy tasks into different segments that would otherwise abort programs. Threads are mainly used to utilize the processor to a maximum extent by avoiding its idle time. Threading lets a program seem as if it is executing several tasks at once. What actually happens is, the time gets divided by the computer into parts and when a new thread starts, that thread gets a portion of the divided time. Threads in VB .NET are based on the namespace System. (Jack Purdum, 2003.)
Traditionally, Visual Basic developers have created synchronous applications in which program tasks execute sequentially. Although multithreaded applications can be more efficient because multiple tasks run more or less simultaneously, they were difficult to create using previous versions of Visual Basic.
Multithreaded programs are possible because of an operating system feature called multitasking that simulates the ability to run multiple applications at the same time. Although most personal computers only have a single processor, modern operating systems provide multitasking by dividing processor time between multiple pieces of executable code called threads. A thread can represent an entire application, but more often it represents just one part of an application that can run separately....
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