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How to check NULL value in .net ?
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| Total Hit (2866) |
IsNull() function of VB6 is not supported in VB.net to check NULL value but there is alternate way to do that
«Code LangId=2»
If rs("Myfield") IS System.DBNull.Value Then
Msgbox("It is NULL")
Else
Msgbox("It is not NULL")
End if«/Code»
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How Do I...Format basic types?
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| Total Hit (2472) |
This sample illustrates how to format base data types for display. Traditionally, formatting the user can see, such as brackets and the dash in a phone number, has not been viewed as the kind of information you want to store in a permanent datastore. The formatting provided in these demonstrations e
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Consuming a Web Service from a Win Form Application
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I guess you might be having some information on what Web Services. If not you can read .net101's article about Web Service Part 1 -Basics. In the current article we will be concentrating on building and consuming a Web Service which delivers "Stock Quotes" on the .NET Platform. We will be using Yaho
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Building a Stock-Quotes Web Service
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| Total Hit (1374) |
I guess you might be having some information on what Web Services. If not you can read .net101's article about Web Service Part 1 -Basics. In the current article we will be concentrating on building and consuming a Web Service which delivers "Stock Quotes" on the .NET Platform. We will be using Yaho
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Creating Custom SOAP Extensions - Compression Extension
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| Total Hit (2252) |
Web Services have already been standardized and its usage if definitely on the rise. Developers are quickly finding new and better ways to apply Web Services in their existing or new application designs. Reviewing many of the Web Services designs I have noticed that developers are increasingly perfo
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XML Web Services (RPC the Easy Way)
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| Total Hit (2194) |
This sample chapter covers following things
«LI»The Role of XML Web Services in a Distributed System
«LI».NET Remoting vs. XML Web Services
«LI»XML Web Service Plumbing
«LI»The Role of IIS
«LI»Creating a Virtual Directory
«LI»The XML Web Service File Format
«LI»Creating an XML Web Service
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Console Enhancements
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| Total Hit (2095) |
System.Console is a class provided by the framework to handle console I/O and redirection. The Win32 API also supports a set of console APIs. Win32 supports a single console for each application (process), even a Windows Forms Application. Consoles support a number of features such as buffering, ful
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Working with OwnerDraw Menus in VB.NET
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| Total Hit (2036) |
When a menu is constructed with the VS IDE menu editor, it's very easy to add menu items and set up the hierarchy of the menu structure. Using just a few mouse clicks and a few keystrokes, your whole menu structure can created in just a few minutes. "So", you may ask, "how do we get these cool image
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Adding icons to menus in VB.NET
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| Total Hit (2132) |
This project add icons in menus in VB.NET. You can use the module 'IconsMenuMain.vb' as base of your project for adding icons. This is most easy that vb6 or other languaje
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Flat VS.NET Style Menus - Even on Windows 98
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| Total Hit (2601) |
First and foremost, this component provides a menu style that is 90% identical to the one provided by VS.NET (the 10% gap is described below in the "Work pending" section, please help me eliminate it). This means that it applies the VS.NET menu style to not only individual menu items but also to the
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Subclassed System Menu
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| Total Hit (2125) |
The reason for this article is to show a method of subclassing an application's system menu, so that extra menu items can be added and click events can be easily handled. This is my first article submitted to CodeProject and all suggestions, criticisms etc. are welcome.
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A class to put a ProgressBar into a StatusBar
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| Total Hit (2064) |
It is not possible to directly put a ProgressBar in a StatusBar in VB.NET. Solutions are available for C++ or VB 5 or 6.0. This is a way to do it in VB.NET.
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Packet Capture and Analayzer
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| Total Hit (2314) |
The first idea of writing a packet sniffer program came from a reply to my comments on one of the projects named "NetSend ( Sending popup messenger messages between computers )" by Marc Clifton. Marc asked me "What about receiving message". To say the truth, I didn't know how I could do that. I knew
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Building Reusable Components in .NET
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| Total Hit (2204) |
One of the main advantages of building components is to promote reusability. For example, if you build a object that represents an invoice, there could be many other projects in your company that can reuse the same object. This concept of re-using components in various projects promotes what is call
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Serialize VB.NET objects without the events
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| Total Hit (1971) |
Because of the way VB.NET implements events, when you serialize an object, its events get serialized too (because events are actually implemented using hidden multicast delegate fields). A side effect of this is that any object which handles events raised by the object being serialized will be consi
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Controlling scrolling with the API
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| Total Hit (2551) |
In certain circumstances, we need to be able to control the scroll bars from our code. This may seem like it should be easily done with standard methods when in fact they are buried in the API. I will tell you how I solved this problem in the application I am working on.
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Real Time syntax highlighting [wrapper class]
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| Total Hit (2581) |
Hello again. This time I wanted to bring you something that was really challenging for me to build. I must have tried at least four totally different solutions to this problem consuming literally days of my time until I reached the best one. At the request of our beloved staff, I will attempt to exp
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Subclassing in .NET - The pure .NET way
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| Total Hit (2202) |
If you are a Visual Basic 6 programmer then you are obviously aware of the sub-classing power. My article demonstrates the same thing for .NET. If you are a C# programmer, then you can easily change this code to fit into a C# Project. This project demonstrates how can you use the .NET way to subclas
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Stopwatch - a High-Resolution code timer class
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| Total Hit (2193) |
Creating an application requires precisely measuring how long specific operations take to complete. You may be searching for performance bottlenecks prior to shipping, measuring to ensure that changes do not unexpectedly degrade performance, or (in my case), testing alternative architectural approac
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Using Message Queing in .NET applications
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| Total Hit (1356) |
Message Queing provides asynchronous programming model for your applications. For distributed and internet applications whene immediate response is not required from the actual server message quing can be used. This makes your application robust as message delivary is guranteed even if the remote se
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Object Oriented Programming with VB.NET and C#
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| Total Hit (487) |
.NET is fully object oriented platform that allow languages to take full advantage of these OO features. The features include:
«LI»Namespace
«LI»Classes
«LI»Objects
«LI»Encapsulation
«LI»Overloading
«LI»Inheritance
«LI»Overriding
«LI»Interfaces
«LI»Polymorphism
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Manipulating Windows Event Log
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| Total Hit (1952) |
Windows Event Log keeps track of system wide and application level events. These events messages constitute things such as information messages, error messages, warnings and alerts. If your system is giving some troubles event log is the first place an administrator will look into. .NET framework pr
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Creating a Windows Service using VB.NET Part-I
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| Total Hit (625) |
Microsoft introduced long running background application called Services along with Windows NT Operating System. These services are multithreaded. Writing a windows NT Service using VB 6 was a tedious job. However, VB.NET masks the task much easy. In this article I will show you how to create a simp
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Monitoring File System Events
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| Total Hit (1274) |
In some applications like file system explorers, file managers etc. it becomes necessary to keep an eye on file system changes. In traditional tools like VB6 this task usually required some third party component or Windows APIs. In .NET the FileSystemWatcher class from System.IO namespace provides e
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Introduction to .NET Reflection
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| Total Hit (1236) |
Reflection is ability to find information about types contained in an assembly at run time. Prior to .NET languages like C++ provided such ability in a limited sense. .NET provides a whole new set of APIs to introspect assemblies and objects. All the APIs related to reflection are located under Syst
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Multithreading in VB.NET
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| Total Hit (1562) |
In past developing multithreaded applications in VB was tedious task. Many times spawning new threads actually spawn errors :-) The picture has changed in VB.NET. VB.NET now has simplicity of Java while dealing with threads. We will see a simple example of running your code in a separate thread in f
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