Using Count(*) is generally better than using Count() with a specific column name, because it gives the query engine the flexibility to find out the row count any way it

You can make a privately inherited member public by specifying its access modifier in the derived class. For example: #include class base{ public: int a; int b; base() { a=10;

When initializing parameters in a constructor, the order of initialization will not be the same as the order in which you typed them. The order of initializing parameters is ‘as

The Java 2 Runtime Environment is the minimum standard Java computing environment for running applications written in the Java programming language. It contains the Java virtual machine, Java core classes,

This tip demonstrates a user interaction (mouse move & mouse click) using native Robot methods.Here’s the algorithm of the program:1. Quickly to move the mouse cursor to the upper left

Merlin (JDK1.4) introduces two new features: JSpinner and MouseWheelListener. Sometimes it is convenient to control the spinner values with the mouse wheel. Here’s an example: import javax.swing.*;import java.awt.event.*;public class TestSpinner

Sometimes you want to create a thread to run something trivial, like when you’re debugging your code. This is a quick way to do it: new Thread(new Runnable() { public

Recently, I found I needed to send e-mail from my program. Because I did not want to create any external dependencies, I decided not to use JavaMail. However, I wanted

The DBList and DBCombo controls expose a MatchEntry property, that – when set to True – permits to perform quick incremental searches by simply typing the searched sequence of characters.

Apart from the different kind of combo boxes you can obtain by manipulating the Style property, another feature is made available by Windows when dealing with combo box controls, the

The only way for a Tab key to insert a tab character in a multiline text box is that the text box is the only control on the form, or

Most MsDos programs used the Enter key to move from one field to the next one. You can easily simulate this behavior by setting the form’s KeyPreview property to True

Many Windows programs use two adjacent list box controls to let the user select a number of items from a list of available values; such list boxes are mutually exclusive,

In all standard controls, Up and Down arrow keys move the focus on the previous or next control in the TabIndex order, respectively. This contrasts with text boxes, where these

Option ExplicitPrivate Declare Function CreateFile Lib “kernel32” Alias “CreateFileA” (ByVal _ lpFileName As String, ByVal dwDesiredAccess As Long, _ ByVal dwShareMode As Long, lpSecurityAttributes As Any, _ ByVal dwCreationDisposition As

Many code wizards and automated source code generators synthesize the following main() template, even if the application doesn’t use command line arguments: int main(int argc, char* argv[]){ return 0;} This

The constructors in a class hierarchy execute in the following sequence: base class constructors are called first, then member object’s constructors, and finally, the constructor of the derived class executes.

Although the advantages of disabling further derivation of a class are often doubtable, C++ allows you to do that by declaring a class’s constructor and other special member functions private.

‘auto’ is undoubtedly the least used C++ keyword. This is because it’s always redundant. auto indicates local automatic storage type, for example: int main(){ auto int x; auto char s[10];}

The precise location of the vptr (the pointer to the class’s table of virtual functions’ addresses) is implementation-dependent. Some compilers, e.g., Visual C++ and C++ Builder, place it offset 0,

Virtual inheritance imposes several restrictions. One of them is that you cannot use a class that has no default constructor as a virtual base class. Consider the following program: struct

Normally, a list of items in a Java application is presented in a JList or JComboBox. If all of the listed items are created equally, the list handles them quite

Here is an example of how to make your application auto start from the registry.The code also shows how to query and clear this. ‘Module: Module1 Option Explicit Private Const

Clicking a submit button on a Web form can create havoc. Here is an easy way to restrict a Web user from clicking the submit button more than once. Once

Most ASP books and articles state that you need to set the Respose.Expires property to 0 or -1 to prevent the end user’s browser from caching an ASP page. However,