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MDAC 2.6 is required for .NET applications
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| Total Hit (2678) |
All ADO.NET applications require MDAC 2.6 or later (MDAC 2.7 is recommended). MDAC 2.7 comes with Visual Studio .NET but no MDAC version is included in the Microsoft .NET Framework SDK and the .NET Framework redistributable package. If your .NET application attempts to open a connection without a va
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LoadTextFile - Load the contents of a text file
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| Total Hit (2809) |
«Code LangId=2»
' Returns the content of the specified text file
' Note: it can throw an exception
' Usage: Dim FileContent As String = LoadTextFile("C:\Autoexec.bat")
Function LoadTextFile(ByVal FilePath As String) As String
Dim sr As System.IO.StreamReader
Try
sr = New
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Calling web services from behind a proxy server
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| Total Hit (2088) |
When you use a web service's proxy class, the calls to the web service might fail if you're behind a proxy server. To solve the problem, you set the Proxy property of a web service's proxy class to an instance of WebProxy, that contains the HTTP proxy settings needed for the web method calls. Here's
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Pasting the text in the Clipboard into a RichTextBox
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| Total Hit (3471) |
«Code LangId=2»' Paste the text currently in the Clipboard into the specified RichTextBox
' Example: PasteIntoRichTextBox (richTextBox1)
Public Sub PasteIntoRichTextBox(ByVal rtb As RichTextBox)
' get the data currently in the Clipboard
Dim data As IDataObject = Clipboard.GetDataObject
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ArrayDeleteElement - Deleting an element in any type of array
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| Total Hit (2573) |
«Code LangId=2»' A generic routine that deletes an element in any type of array.
' Example: deleting the 2nd element of the array arr
' ArrayDeleteElement(arr, 1)
Sub ArrayDeleteElement(ByVal arr As Array, ByVal index As Integer)
' Shift elements from arr(index+1) to arr(index).
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Extract null-delimited strings
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| Total Hit (3632) |
Most API function that return a string require that you pass a buffer where they can place the result as a null-terminated ANSI string (a.k.a. ASCIIZ string). The calling code must then extract the string by taking all the characters up to the first Chr$(0) character, if there is one. For example, t
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Change the application priority
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| Total Hit (2922) |
The application's priority - and more in general the thread's priority - indicates how the application is "important" for the CPU. The more the priority is hight the more the CPU will dedicate his time to execute it.
In .NET the priority of a thread is indicated to the Thread.Priority property. B
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Create all the subdirectories for a new folder
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| Total Hit (3774) |
The System.IO.Directory class exposes a CreateDirectory method that, as its name suggests, can create a subdirectory. However, this method is even more powerful than it appears at a first glance, in that it can even create all the intermediate subdirectories, if necessary. In other words, the follow
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GetDirectorySize - Calculate the size of a directory
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| Total Hit (2782) |
«Code LangId=2»
' Returns the size of the specified directory
' - Note: requires Imports System.IO
' - Usage: Dim DirSize As Long = GetDirectorySize("D:\Projects")
Function GetDirectorySize(ByVal DirPath As String) As Long
Dim DirSize As Long
Dim Dir As DirectoryInfo = New DirectoryInfo(
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Showing and enumerating MDI child forms
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| Total Hit (3181) |
An MDI child form is a regular form whose MdiParent property points to its MDI container form, so the code that creates and displays a child window is very simple:
«Code LangId=2»
Sub ShowMdiChildWindow()
' Display the MenuForm form as a child of this form.
Dim frm As New MenuForm()
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.NET Overview - sample chapter from Introducing .NET
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| Total Hit (1299) |
This first chapter will summarize many of the most important aspects of .NET. We'll start by looking at some of the serious drawbacks of current software development that prompted Microsoft to rethink their entire development structure. Then we'll progress to an overview of the overall vision and th
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Multicast Sockets
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| Total Hit (3895) |
In this chapter, we will create two Windows applications using multicasting features. With one application it will be possible to chat with multiple systems, where everyone is both a sender and a receiver. The second application – in the form of a picture show – demonstrates how large data packets c
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Adding Mouse Gesture Support to .NET Windows Applications
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| Total Hit (1969) |
Use of mouse gestures to control application is becoming increasingly common in the more sophisticated web browsers. This sample demonstrates how you can support a range of mouse gestures in .NET Windows Forms Applications by implementing an IMessageFilter. VB.NET and C# code provided.
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ADO.NET: Convert an ADO Application to ADO.NET
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| Total Hit (591) |
This is an example of an ADO application that has been ported to .NET without the original graphical interface. It also shows the usage of a forward-only read-only fast DataReader. It shows how to use a DataView class to take a table from a DataSet and operate on it in a fashion similar to the old A
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SOAP Basics : Sample Chapter from Professional XML Web Services
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| Total Hit (1972) |
At the core of the Web Services model is SOAP (Simple Object Acc Protocol), the protocol that allows messages to be transmitted as XML documents and invokes the capabilities of Web Services. The SOAP standard is the key to Web Services.
This chapter delves into SOAP 1.1, and the concepts needed to
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How Do I... Get Started Using Interoperability?
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| Total Hit (1636) |
The common language runtime's COM interoperability services make it possible to use existing COM objects from within managed applications and expose managed objects to existing COM applications.
Note: Managed code is code that targets the common language runtime.
In addition, the runtime's p
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Using Threads
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| Total Hit (2326) |
This article explains the different models of threading — single, apartment, and free — and the use of each model. It also introduces a code sample in C# that uses threading to help you write applications that will take advantage of threading. The article also discusses important issues involved in
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Serialize VB.NET objects without the events
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| Total Hit (1972) |
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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Skinned ListBar
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| Total Hit (1948) |
This article demonstrates overriding the drawing routines in the Outlook Style ListBar to create a new ListBar which inherits the behaviour of the original control but draws in a much customised way.
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