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Locale-aware string conversions
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| Total Hit (2755) |
You can use the usual UCase, LCase, and StrConv functions to convert a string to upper, lower, and titlecase (e.g. "This Is A Title"). However, VB.NET offers is much more flexible, and lets you convert the case of a string according the locale you specify. You can do this through the methods of the
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Reduce COM+ context overhead: use modules and shared members
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| Total Hit (2723) |
If you use Shared members in .NET or modules in VB6, you reduce COM+ context overhead without any risk whatsoever that you will get extra context overhead for that code. You also release yourself from the clean-up burden that you have in both worlds. Instead of the VB6 consumer code:
«Code LangId
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Reusable function to open form by name
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| Total Hit (2399) |
«code LangId=2»Private Sub showForm(ByVal frmName As String)
Dim frm As Form
frm = AppDomain.CurrentDomain.CreateInstanceAndUnwrap( _
Me.GetType.Assembly.GetName.Name, _
System.String.Concat(Me.GetType.Assembly.GetName.Name, ".", frmName) _
)
frm.Show()
End
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Evaluate an expression using the Microsoft Script Control
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| Total Hit (3521) |
Thanks to COM Interop, you can still use the Microsoft Script Control from VB.NET and any other .NET language. To do so, you must add a reference to the Microsoft Script Control library (from the COM page in the Add Reference dialog box): this action creates a new reference named Interop.MSScriptCon
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Including/excluding files in Visual Studio .NET
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| Total Hit (2539) |
Say that that you have an existing Visual Studio .NET project, and that you copy a lot of new source code files, images and other stuff from another project (maybe you're merging two projects, or a colleague wrote and passed those files to you). One approach to include the new files is to use the Pr
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IsValidUsPhoneNumber - Validating a US phone number
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| Total Hit (2960) |
«Code LangId=2»
' Validate a US phone number
' Example:
' MessageBox.Show(IsValidUsPhoneNumber("(123) 456-7890")) ' True
' MessageBox.Show(IsValidUsPhoneNumber("(123) 456-78901")) ' False
Function IsValidUsPhoneNumber(ByVal phnNum As String) As Boolean
Return System.Text.RegularExp
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Create a command-line filter utility
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| Total Hit (2779) |
The Console class exposes two properties that make it very simple to create command-line utilities that work as filters, exactly like the FIND and MORE utilities that are provided with the operating system. The Console.In property returns a TextReader object that reads from the standard input channe
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Copying data into the Clipboard
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| Total Hit (4575) |
Copying a piece of information into the clipboard is as easy as calling the Clipboard.SetDataObject: you can pass this method a string, an image, and so on. If you pass it a string that contains text in Rich Text Format (RTF), the Clipboard object detects this format automatically. For example, the
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ArrayListJoin - Merging two ArrayList objects
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| Total Hit (2876) |
«Code LangId=2»' A reusable function that merges two ArrayList objects
' Example:
' Dim al As New ArrayList()
' al.Add("Jack")
' al.Add("Mary")
' val.Add("Bob")
' al.Add("Tom")
'
' Dim al2 As New ArrayList()
' al2.Add("Frank")
' al2.Add("Lee")
' a
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Creating a project into an existing folder
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| Total Hit (2547) |
When you create a new project, VS.NET automatically creates a folder with the project's name under the selected directory. If you name your project MyTestProject, and select an existing folder named c:\My Project\MyTestProject as destination directory, in reality the final project's folder will be c
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Don’t use the GotFocus and LostFocus events
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| Total Hit (4481) |
Have you ever tried to change the BorderStyle, HideSelection, MultiLine, ScrollBars, WordWrap and TextAlign properties of a TextBox, or the ComboBox’s RightToLeft property from inside the control’s GotFocus or LostFocus events? You’ll get a System.ComponentModel.Win32Exception exception saying "Erro
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Drawing Bézier splines
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| Total Hit (3469) |
GDI+ supports two different forms of a complex curve that can't be represented as an arc of a circle or an ellipse: a cardinal spline and a Bézier spline. A Bézier spline is a curve specified by four points: the initial point, the ending point, and two control points. The curve doesn't pass through
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Hex2Dec - Convert from hexadecimal to decimal
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| Total Hit (8223) |
«Code LangId=2»' convert from hexadecimal to decimal
Function HexToDec(ByVal value As String) As Long
' we just need a call to the Convert.ToInt64 static method
Return Convert.ToInt64(value, 16)
End Function
«/Code»
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IsComDLL - Check whether a DLL is an COM self-registering server
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| Total Hit (3050) |
«Code LangId=2»<System.Runtime.InteropServices.DllImport("kernel32")> Shared Function _
LoadLibrary(ByVal path As String) As Integer
End Function
<System.Runtime.InteropServices.DllImport("kernel32")> Shared Function _
GetProcAddress(ByVal hModule As Integer, ByVal procName As String)
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Use VB6 ActiveX controls with VB.NET
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| Total Hit (4016) |
It is possible to use VB6 ActiveX controls - such as ADO Data Control, Chart Control, Comm Control, and the Windowless controls - with the designer of Visual Studio .NET, but you may encounter problems when doing so because VS.NET doesn't come with the design-time license for these controls, therefo
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How Do I...Read XML from a file?
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| Total Hit (948) |
This sample illustrates how to read XML from a file using the XmlTextReader class. This class provides direct parsing and tokenizing of XML, and implements the W3C Extensible Markup Language (XML) 1.0 and the Namespaces in XML specifications.
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DataSets in Microsoft .NET - 2
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| Total Hit (1310) |
In the previous part of this article we discussed different features and how to create a dataset in design time lets go further in detail. In this part I will discuss about sort, search and filtering support provided by dataset and data table object.
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.NET Remoting - Part III/IV
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| Total Hit (2948) |
Remoting provides a very flexible environment for distributed applications in the .NET arena. In part one I introduced the background to distributed applications and the .NET remoting architecture that aims to support distributed applications. In part two we looked at some examples of the applicatio
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How Do I...Load a DataSet with XML?
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| Total Hit (992) |
This sample illustrates how to load a DataSet with XML Data. The sample builds on the topic, How Do I...Create DataSet mappings from an XSD schema?, by first loading XML data into an XmlDataDocument and then accessing this data from the DataSet. The DataSet has previously loaded a schema in order to
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How Do I...Throw an Exception?
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| Total Hit (1374) |
This sample illustrates how to throw an exception. A try..catch..finally block is used in to illustrate to use and catch the exception you threw. It is important to remember that when you throw an exception, you need to document the exception you throw, so that users are aware they need to include a
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How Do I...Work with the global assembly cache?
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| Total Hit (1031) |
The global assembly cache is a machine-wide store used to hold assemblies that are intended to be shared by several applications on the machine. The .NET Framework provides two tools for working with the cache. One is a Windows shell extension that allows you to work with the cache using a Graphical
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