Each browser has its own way of managing whether or not a page is cached. You can prevent a browser from caching a Web page programmatically by setting the Response.Expires

If your ASP application is experiencing browser page loading performance problems, you may want to consider implementing one or both of the following techniques. First, a fairly easy way to

If you expect a user to enter a numerical value in a text box, you’ll want to do some data validation on the number. But suppose he’s included a dollar

When a browser requests an ASP page from the Web Server, but does not wait for the entire page to be downloaded, the server continues to process the request, wasting

One obvious way to display or filter large recordsets is alphabetically. This function will take a page file and an optional frame name (defaults to _self) and create a row

You can call a function from a link, instead of opening a new location, by assigning the function to the anchor tag’s href attribute, like this: Click here Notice that

Question: When I use a datawindow to generate a custom report, how can I pass a variable into the report from an input field? Answer: You can do this through

Question: About halfway through compiling a 32-bit EXE with PB 6.5 on Windows NT, I keep getting an “out of memory” message box and then another that says “DDE Server

Question: Can I insert comments inside a SQL query, like &#47&#42 &#42&#47 and &#47&#47in C++? Answer: SQL supports &#47&#42 and &#42&#47 for comments inside stored procedures and queries. You also

Question: I have several tables with the same structure and I’m trying to combine them all into one unique table. But I’m worried about performance because each table has a

Question: When I try to create a new IIS app,I receive an error message: “IIS or peer web services 3.0 or latermust be installed,” but IIS is installedand running on

Question: Can three versions of PB (5.0, 6.5, and 7.0) coexist on the same machine without any problems? Answer: I am running PB5.0.4, PB6.5, and PB7.0.1 on my home and

Question: How do I test the number of ‘characters’ contained within a given variable? Answer: Try this: Debug.Print “Length: ” & Len(CStr(X)) Once you convert a variable to a string,

Question: How do I use the ADO events FetchProgress or FetchComplete? Answer: If you want to use these, they work just like other events generated by other objects. When you

Question: What is the proper syntax to insert a column into an existing SQL table? Answer: Here’s the syntax to add a column to a table: ALTER TABLE Employees ADD

Question: Using a single datawindow, can I access data from multiple databases (Oracle and Sybase)? If not, can I use PowerBuilder to access it without having any intermediate table? Answer:

STL’s unique() algorithm eliminates all but the first element from every consecutive group of equal elements in a sequence of elements. unique() takes two forward iterators, the first of which

A bit field can be signed or unsigned. According to the C++ standard, a signed bit field may be represented in one of three ways: two’s complement one’s complement sign

Although usually I don’t recommend using macros in C++ code, there are a few exceptions. One such exception is when you want to create a truly immutable constant. Consider the

If you happen to define an object or a function or a constant whose name collides with a macro located elsewhere in a third-party header file, as in: // file

Open source products come with their source code files. Although you can usually install a ready-made executable file, you want to take advantage of the available source code files and

Many modern operating systems support Symmetric Multiprocessing (SMP)?a hardware architecture that uses two or more processors on one machine and enables you to achieve true multitasking. On SMP architectures, multithreaded

The members of an enumerated type are called enumerators. For example: enum Direction { Up, // an enumerator Down // another enumerator }; int main() {} An enumerator’s scope is

I receive many questions from readers asking for guidance on how to port an existing C++ app to a different compiler or platform. Porting software can be very easy or

On modern operating systems, a process consists of an executable file that the OS loads into the system’s memory and executes. A process normally has an entry point and one

Question: How do I drop a table column? Answer: To drop a column, use this syntax: ALTER TABLE Employees DROP COLUMN HomePhone Just remember that you can’t drop a column

Question: How do I create a constructor for a protected member of a class? I have declared the function in the header file but not defined the definition.The error message

Question: I need a query that retrieves info from an Oracle table and a query that retrieves info from a SQL Server table. The info has to be joined together

Question: What are the differences between Provider=MSDASQL.1 and Provider=SQLOLEDB.1 in an “Open” “Select” statement? Also, what is the difference (if any) between “ADO” AND “OLE/DB”? And finally, in Visual Basic,

Question: I have two questions: 1. How can I determine what the server’s lock mode currently is (e.g. WAIT, NO WAIT, etc.), without actually setting it at the same time?