VB official documentation seems to encourage you to use “$-less” string functions, e.g. Left, LTrim or UCase, instead of their time-honored Left$, LTrim$ and UCase$ counterparts. If you do so,

The TreeView control exposes the AfterLabelEdit event to let the programmer validate the text entered in a Node, but there is no way to trap keys as they are typed

Visual Basic stores UDTs in unpacked format, that is it alignes all UDT elements to the double word (except that Integers and Boolean are aligned to the word, and byte

When dealing with proper names, you may want to capitalize the first letter of each word, e.g. convert “john smith” into “John Smith”. Under VB3 you had to write a

Here’s a simple test that you can use to determine whether the application is running on a system equipped with a Pentium CPU affected by the FDIV bug: ‘ return

The behavior of the LostFocus event has changed in the transition from VB4 to VB5. Under VB4, if a control on a form has the input focus and the user

The following is an example to handle errors in VB. It combines “On ErrorGoTo” and “On Error Resume Next” to handle all errors (minor orserious ones), as well as attempting

In JavaScript you can use isNaN to check if the given data is numeric ornon-numeric.Syntax : isNaN(testdata)ReturnValue :True if the testdata is non-numeric.False if the testdata is numeric.Here’s an example:

The following methods can be used for creating new instance of your classes, depending on your specific needs. import java.lang.ClassLoader;import java.net.URLClassLoader;import java.net.URL;public class InstantiateClass { testFinally newInstance() throws Exception {

Using the -verbose option during compilation and execution is very helpful&#151both for obtaining more information about the classes being loaded by the compiler and the interpreter and to find out

Once you are finished iterating through the values of an Object implementing the Enumeration interface, the next time youtry to use hasMoreElements() it will return false. Many developers are not

Use the fillInStackTrace() method to rethrow a Throwable type of exceptional condition in your code. This is useful if you want to rethrow a exception occurred while using a method

Validating user input that is typed into a JTextField can becumbersome, especially if the input string must be converted to anumeric value such as an int. By subclassing JTextField, however,

The SELECT INTO statement is a combination of the SELECT and INSERT T-SQL commands, that lets you create a new table from a subset of the rows and/or the columns

The keywords false and true are Boolean literals that evaluate to 0 and 1 respectively. Note that in other programming language, VB for instance, false equals -1 and true equals

C++ allows casting a pointer to member functions of one type to another pointer to member, as long as the signatures of the two match. However, the results of such

Here’s a topic that was recently discussed at the Standardization committee. Suppose we have the following enum type: enum Stat { good, bad}; Is it legal to use the enumerator

Does your C++ compiler accept the following code? char s[3]=”abc”; // illegal in C++, no place for ” The standard requires that the size of a char array initialized with

The implementation ensures that functions having an exception specification should throw only exceptions that are listed in their exception specification. For example: class X{};class Y{};void f() throw X{ throw Y();

In a previous tip, http://www.devx.com/free/tips/tipview.asp?content_id=1585 , I explained the concept of lvalues and rvalues. Binding a reference to an rvalue is allowed as long as the reference is const. The

The name of the executable is stored in the string argv[0]. To access it, declare your main() function as follows: int main(int argc, char ** argv) Even if the application

It may be tempting to squeeze an extra pint of performance by removing all debug information from the release version. However, it’s recommended to leave minimal debugging info even in

The interface of a class consists of its public members. Usually, private members represent implementation details and are not exposed to other classes and users. Private members can be member

Question: Does “Connection.setAutoCommit(false)” mean “begin a transaction?” Answer: By default, JDBC connections start in autocommit mode. This means that every executed statement is treated as a separate transaction. A transaction

Question: Suppose a client of a Web application logs in using a login-handler servlet, and then some back-end operations using EJBs need to be performed. Can I store the initial

Question: What is the difference between a JavaBean and an Enterprise JavaBean? Answer: It is natural to be confused regarding the relationship between JavaBeans and Enterprise JavaBeans (EJBs), because they