Trek Innovations

In this article I gave the examples for all Oops concepts in console applications using VB.NET. This article is only for the beginners who want to learn .NET. And in my next article I will give the same examples using C#.

In this article you will see the examples for:

1. Single Dimension Arrays
2. Two Dimensional Arrays
3. Jagged Arrays
4. Structures
5. Classes
6. Method Overloading
7. Constructors
8. Default Constructors
9. Shared Constructors
10. Constructor Overloading
11. Shared Variable
12. Parameterised Constructors
13. Using ME Object
14. Inheritance
15. Overloading Methods
16. Method Overriding
17. Constructor With Inheritance
18. My Base with Constructor
19. Abstract Class
20. Interfaces
21. Exception Handling

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AJAX Cascading Dropdown Component using WCF

1. Create new Asp.Net Website

2. Add new item for XML file with the name LaptopsService.xml (Data source for DropdownList Items)

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Connecting Data & XML via ADO.NET

In this article you can see how to work with XML documents with the help of ADO.NET. In this there are two approaches to work with XML and ADO.

1. You can use ADO.NET to access XML documents.

2. You can use ADO.NET and XML to access XML. Apart from this, you can access RDBMS using ADO.NET and XML.NET.

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Windows Presentation Foundation Styles

Using WPF styles, we can handle look and feel of the controls. If we are setting styles, mechanically change look and feel of the every control of that type in that application.

XAML styling is very similar to HTML and CSS, and you can apply styling in related behavior. For example, we can define the appearance for all buttons (control) in an application; confine it to all buttons on a screen, to a group of buttons, or to apply a special style for just one button. In that case, XAML came into the picture to define the appearance of the controls. Styles are applied to controls. Styles can be applied to an individual Controls, a page or window or in an external file that can be shared by multiple pages, windows, or applications.

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Basic Concepts of Oops

Value Type Data Types

1. Memory allocates at compile time in stacks

2. De-allocation will be take care by stacks

Reference Type Data types

1. Memory allocates at runtime time in heap

2. De-allocation will be take care by Garbage Collector

Classes

1. It’s a reference type data type

2. It’s a user defined data type

3. Collection of properties (data) and behaviour (functions) is called a class

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Google (G1) vs iphone

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The Controls collection cannot be modified because the control contains code blocks (i.e. <% … %>).

Error Page

Basically this error occurs when a code block is placed in the MasterPage like this

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Concurrence Mode Instance specifies a service class supports single/multi-threaded modes of operation or not.

WCF follows an asynchronous messaging. It makes extensive use of asynchronous I/O, and as a result, each received message may be dispatched to a receiving object by different threads. Because of this feature allows WCF to use the CPU efficiently, and as a result, allows WCF applications to scale.

Below given example make clear the concurrence mode instance, how service class works with ConcurrencyMode instance property on the ServiceBehaviorAttribute type with respect to the client requests.

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