Download Accelerated VB 2005 by Trey Nash PDF
By Trey Nash
Speeded up VB 2005 presents the quickest route to VB services for someone already accustomed to object-oriented programming. whereas books introduce VB, only a few additionally clarify optimizing its use with the .NET universal language runtime (CLR). yet this booklet either teaches middle VB language thoughts and covers intensive the suggestions and strategies for professionally exploiting the ability of VB and the CLR.You'll fast grasp VB syntax whereas studying how the CLR simplifies many programming projects. you are going to additionally examine top practices that confirm your code might be effective, reusable, and strong. Why spend many months or years learning the easiest how you can layout and code VB, while this publication will make it easier to do issues the correct approach, correct from the beginning? * you will fast achieve thorough figuring out of VB 2005. * This booklet covers the all new good points of VB 2005. * Authors man Fouché and Trey Nash describe and clarify VB top practices. * The publication offers canonical varieties for VB periods and interfaces. * Examples reveal bullet-proof, exception-safe code and effective multithreaded functions.
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To get to these namespaces, simply enter My in the VB IDE and look at the IntelliSense options. The naming of the My namespaces gives you a pretty good idea of what kinds of classes are contained in each one of them. qxd 2/15/07 9:17 PM Page 9 CHAPTER 1 ■ VB 2005 OVERVIEW Summary In this chapter, we’ve touched upon the high-level characteristics of programs written in VB. That is, all code is compiled into IL rather than the native instructions for a specific platform. Additionally, the CLR implements a GC to manage raw memory allocation and deallocation, freeing you from having to worry about one of the most common errors in software development: improper memory management.
Figure 2-1 shows a screenshot of the utility. Figure 2-1. The Windows interface of the MSIL Disassembler also known as ILDASM If you run the utility, it displays a tree view of the type data from the assembly, so you’ll need to dump the IL to a file via the File ➤ Dump menus. Console::WriteLine(string) IL_000b: nop //000004: End Sub IL_000c: nop IL_000d: ret } // end of method EntryPoint::Main As you scroll through the IL file, you’ll see that it completely describes the program in a low-level manner.
Option Strict only allows widening conversions. If Option Strict is On, VB will only allow variables to be converted from one data type to another data type in which no data loss would occur. If a variable is being converted and the resultant type has less precision or smaller capacity, a compiler error will be generated. Option Strict also disallows late binding. If Option Strict isn’t specified, the compiler default is Off. Using the second ComputeAvg function shown previously, you can see that the following code will fail at compile time because Option Strict won’t allow an implicit conversion from Object to Double.