
By Wei-Meng Lee
Ok, all you VB6 builders - time's up. As of March 2005, Microsoft not helps this model of visible easy. and also you cannot blame them. 3 years in the past, they brought the .NET Framework - a sublime, robust platform - in addition to the hot component-based VB.NET language. yet approximately 5 million of you made the choice to stay with VB6, often to keep up legacy home windows and COM tasks. Now, with the approaching unlock of VB 2005, Microsoft has a number of beautiful purposes to improve that you will locate tough to withstand, together with the go back of a few VB6 positive factors. And we have now the proper ebook that can assist you make the conversion: visible uncomplicated 2005 Jumpstart. Now, you could test-drive the beta model of VB 2005 with 3 hands-on initiatives that aid you study the syntax of this new language speedy. VB 2005 not just allows you to convert the majority of your present VB6 code, yet deals a number of universal beneficial properties, resembling compile-and-run debugging, new MyClasses that simplify use of .NET libraries and frameworks, plenty of IDE aid for home windows, internet and cellular GUI improvement, and knowledge entry controls that heavily resemble what you employ now. the genuine plus is that you will be utilizing those beneficial properties with the .NET platform, that's safer, much less advanced than COM, and gives OneClick deployment.Visual simple 2005 Jumpstart allows you to get the texture of this platform for development smart/rich home windows types consumers, ASP.NET internet purposes, and internet prone. writer Wei-Meng Lee, a Microsoft .NET MVP, veteran O'Reilly writer and common contributor to the O'Reilly community, has prepare 3 worthwhile test-drive tasks, entire with code samples, that allow you to increase: a private library home windows applicationA Web-based buying cart applicationA inventory enquiry internet ServiceOur jumpstart consultant is the fast, painless option to migrate from VB6 to VB 2005, and the fitting education handbook for relocating your company to the extra strong, dynamic and safe global of .NET.
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It is this type of error that must (and can) be prevented. To ensure that an application is as robust and bug free as possible, it is important to anticipate as best you can all of the errors that might occur while your program is running. In VB 2005, error handling has been much improved over VB 6. VB 2005 now supports both structured and unstructured error handling. VB 6 Tip: In VB 6, error handling was unstructured, performed using the primitive On Error and On Error Resume Next statements. The specific information about an error that occurred can be retrieved from the Err object.
VB 6 Tip: The venerable VB 6 Variant data type in VB 6 is no longer supported in VB 2005; you should use the Object type instead. Object and the types that derive from it are discussed at greater length in Chapter 3. Intrinsic and User-Defined Types 37 38 VB 6 and VB 2005 support two types of intrinsic data types and user-defined types. Intrinsic data types are those types that are built into the language. Examples of intrinsic data types are Integer, Short, and Char. User-defined types (UDT), on the other hand, are data types defined by programmers.
However, VB 2005 provides you with an additional way to return values in a function by means of the new Return statement. NET Framework Class Library through the new My namespace (see "My Namespace," later in this chapter). Exiting or Skipping a Loop You can exit a loop at any time by using one of the following statements: Exit For Exit Do Exit While In VB 2005, you can transfer control immediately to the next iteration of a loop by using the Continue keyword. Consider the following: For i As Integer = 0 To 10 ' prints out all odd from 0'to numbers 10 If iContinue Mod 2 = For 0 Then 60 61 MsgBox(i) Next The preceding code snippet prints out all the odd numbers from 0 to 10.