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Object Oriented features in VB.net (Part-2)
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| Total Hit (10895) |
In the previous article we discussed the basic concepts of Object Oriented Programming. Now let's implement all this in our favorite language - VB.net.
«big»Creating Classes in VB.net«/big»
As we discussed earlier, objects are instances of a specific template – called a Class. A "Class" contai
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Make read-only properties visible to Web Services clients
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| Total Hit (2052) |
Read-only and write-only properties in a Web Service class aren't visible to the Web Service client. The reason is that XML serialization doesn't support these sort of properties, and read-only and write-only properties aren't included in the Web Services Description Language (WSDL) documentation.
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Converting a date string entered by the user to a VB Date value.
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| Total Hit (2263) |
This code formats a date string entered by the user, adding slashes and correct number of year digits and converts it to a proper date format.
You can use the following code to make your user interface more friendly. It will help you in correcting and preventing mistakes over what date is entered.
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Determine type and number of CPUs
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| Total Hit (4426) |
There is no method call that directly retuns information about the number and type of installed CPU(s). However, this information is stored in a few environment variables, so it's just a matter of extracting it with the Environment.GetEnvironmentVariable method:
«Code LangId=2»
' this code is me
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ArrayInsertElement - Inserting an element in any type of array
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«Code LangId=2»' A generic routine that inserts an element in any type of array.
' Example: inserting an entry of value 5 between the 1st and 2nd entry of the
' array arr
' ArrayInsertElement(arr, 1, 5)
Sub ArrayInsertElement(ByVal arr As Array, ByVal index As Integer, _
Optional By
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Convert dates entered by user as strings to VB Date values.
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| Total Hit (3617) |
This code formats a date string entered by the user, adding slashes and correct number of year digits and converts it to a proper date format.
You can use the following code to make your user interface more friendly. It will help you in correcting and preventing mistakes over what date is entered.
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How Do I...Build a .NET COM Server Callable from COM clients?
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| Total Hit (1671) |
This section explains how to build and install managed code that will be used from COM applications. The steps involved in the build process are as follows:
«LI»Write and compile the managed code.
«LI»Generate a type library for the assembly using the tlbexp.exe utility.
«LI»Install and regi
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How Do I...Navigate XML with the XPathNavigator?
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| Total Hit (1009) |
This sample illustrates how to navigate XML documents with an XPathNavigator created from an XPathDocument. It also demonstrates how to use an XPathNodeIterator. The XPathNavigator class provides a cursor-style model to navigate an XML document. This topic also introduces XML Path Language (XPath) e
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Adding an Icon or Control to a TextBox or ComboBox
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| Total Hit (2572) |
The standard .NET Framework ComboBox does not support an icon in the text box section of the control. This article presents a class which can be used to show an icon, a control or a custom-drawn image into any TextBox or ComboBox (VB.NET and C# code provided).
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Custom Actions - Part 2
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| Total Hit (1891) |
Custom Actions are deployment projects .NET programs written by your team that execute near the end of the installation process. You can use them to perform installation shores hard to implement with the existing features exposed by the setup project, in this order of ideas a custom action can insta
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How Do I...Marshal Strings Between Managed and Unmanaged Code?
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| Total Hit (861) |
This example demonstrates how to marshal strings from .NET client to COM server.
In order to use the types and methods defined within a COM library from managed code, you have to obtain an assembly containing definitions of the COM types. Refer to the How Do I...Build a .NET Client That Uses a CO
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Common Applications of Regular Expressions
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| Total Hit (1861) |
Regular Expressions (for those not yet acquainted with them) provide a way of matching patterns of strings that may be simple or extremely complicated and they do it in a very efficient manner. For an introduction to regular expressions in ASP be sure to read: An Introduction to Regular Expressions
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Dynamically executing code in .Net
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| Total Hit (3977) |
Dynamic code execution is a powerful feature that allows applications to be extended with code that is not compiled into the application. Users can customize applications and developers can dynamically update code easily. In this article, Rick takes a look what it takes to execute code dynamically w
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Using Visual Basic .NET to Access Google's Web Service
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| Total Hit (1572) |
Learn how to access the Google Web APIs service from a Visual Basic .NET Windows front end. This article describes how to call a SOAP Web service, execute a Google search, access a page in Google's cache, and call the Google spell checker.
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Calculating CRC32 (and MDA5 and SHA-1) From .NET
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| Total Hit (2435) |
The CRC (Cyclic Redundancy Checksum) algorithm is a highly optimised and powerful way of checking whether a large number of bytes have been modified or not. The algorithm scans through all the bytes and generates a 32 bit number to represent the contents - small changes in the file contents result i
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How Do I...use multiple XmlReaders
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| Total Hit (1020) |
In some situations, you may have one reader that reads part of an XML document, and one or more other readers that read the rest of the document. For example, an e-commerce ordering system may have orders submitted as XML documents. In processing these orders, one reader may process information at t
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ADO.NET: Work with Typed Data
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| Total Hit (640) |
ADO classic code provides late-bound access to values within its recordset through weakly typed variables. ADO.NET code enables you to access the data held in the DataSet through a "strongly typed" metaphor. This means you can access tables and columns that are part of the DataSet with user-friendly
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