Reflector 5.0 available

Just in case you have not heard about it, Reflector, a must-have for .NET developers, was released version 5.0. If you have not used it (shame on you – I am kidding :-)), here is what it is: “Reflector is the class browser, explorer, analyzer and documentation viewer for .NET. Reflector allows to easily view, navigate, search, decompile and analyze .NET assemblies in C#, Visual Basic and IL.” Reflector can be downloaded here.

Download MS Virtual PC 2007

Microsoft is giving away their Virtual PC 2007. Yeah, it’s FREE. Here is the download link: Microsoft Virtual PC 2007 (FREE) Enjoy!

The advanced theme of WordPress rich text editor

Do you know there is an advanced theme in the rich text editor of WordPress? If you don’t know, then you have missed a lot. Here is the way to turn it on: First of all, you have to choose to use rich text editor, which can be set in the Options. 1. Place your cursor in the rich text editor with the Viual mode selected. 2. If you are using FireFox, then press Shift+Alt+v; […]

Data Type Summary (Visual Basic)

Visual Basic type Common language runtime type structure Nominal storage allocation Value range Boolean Boolean Depends on implementing platform TrueFalse Byte Byte 1 byte 0 through 255 (unsigned) Char (single character) Char 2 bytes 0 through 65535 (unsigned) Date   class=SpellE>DateTime 8 bytes 0:00:00 (midnight) on January 1, 0001 through 11:59:59 PM on December 31, 9999 Decimal Decimal 16 bytes 0 through +/-79,228,162,514,264,337,593,543,950,335 (+/-7.9…E+28) † with no decimal point; 0 through +/-7.9228162514264337593543950335 with 28 places […]

Controlling Variables in For Loops

The For and For Each loops let you define their controlling variable as a block variable, using this syntax: For i As Integer = 1 To 10 … Next This syntax was introduced in Visual Studio.NET 2003. Many books and articles, however, continue to use the old syntax: Dim i As Integer For i = 1 To 10    … Next The new syntax is preferred in all cases because it prevents you from accidentally reusing […]

AJAX Drop Down List – Part Three

In the part one and part two of AJAX Drop Down List tutorial, I have described how to populate a drop down list with plain string data and XML string data respectively. If you followed the first two parts of the tutorial and built your drop down list, you will probably notice that you cannot use “ddlChildList.SelectedValue” to retrieve the value from the drop down list. The reason is that the drop down list is […]

AJAX Drop Down List – Part Two

In the part one of AJAX Drop Down List tutorial, I described how to popuate a child drop down list with plain string data. In this post, I will describe how to use XML data to populate the child drop down list. There are not gonna be many changes, so I will just address those need to be changed. 1. Client Side Page – ProductList.aspx There is no chnage except the JavaScript code, I will […]

AJAX Drop Down List – Part One

I wrote a tutorial on using AJAX technology in ASP.NET applications, and it only shows a very simple but common use of AJAX. Another common use of AJAX is to populate a drop down list based on the selection of another drop down list without using post back. It is especially useful when populating a large drop down list and the connection is not so fast. Let’s get started. Before we go too far, let’s […]

“ConstraintException Was Unhandled – Column is Constrained to be Unique…” error

I like to use DataAdapter to create a Data Access Layer to manipulate data in my applications. One of the advantages of using DataAdapter is that it allows you to insert/update/delete data in a batch mode by using Strong Tyed DataTable. How it works? Every record in the Strong Typed DataTable has a property called RowState that keeps track of the status of the record. For example, when a record is deleted from DataTable, the […]

I fixed our laptop!!!

Our old laptop has been giving us problems for about two years. When I am surfing the Internet, the laptop will freeze up unexpectedly, especially if I scroll the page up and down frequently, then the laptop will freeze up. I have tried several ways to fix the problem, but in vain. Here are the methods I have tried before: Reinstall Windows XP. Yeah, it is always our first choice when we deal with Windows […]