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Graphics with C#

The .Net provides classes for the programmer to be able to work with graphics. This technology is called GDI+ and controls custom drawing on the screen. These classes instruct the graphics device driver to send the appropriate output on the screen. This tutorial is an introduction to the GDI+ technology in order to start drawing simple objects on screen.

Not yet rated with 119 hits  Added on: Sep 12, 2008

Creating Emails in C#

E-mail is an extremely popular communication mechanism. The .Net framework has added the System.Net.Mail namespace which provides classes that enable you to easily create and transmit email messages. Messages can include plain text and attachments. In this tutorial we will talk about creating emails.

Not yet rated with 119 hits  Added on: Sep 12, 2008

Sequential Lists: The Queue and Stack Class

Sequential lists are collection of objects that can be entered or extracted in a sequential way. They don’t provide access to objects in the middle on the list. You can only access a specific object each time you extract it. The two classes named “Queue” and ”Stack” which belong to the “System.Collections” namespace provide you with this kind of functionality, each of them in a slightly different way. The Queue class offers you access to the first object on the list, whereas the Stack class offers you access to the last object on the list. By first and last we mean the first and last object that entered the list. So, the Queue class is a First-in, First-out collection(FIFO Collection) whereas the Stack class is a Last-in, First-out(LIFO Collection). In this tutorial you will create and use both classes to see how they behave when entering and extracting data. You will usually work with such collections with temporary and disposable data. For a more permanent use, arrays provide much better functionality.

Not yet rated with 110 hits  Added on: Sep 12, 2008

Serialization in C#

Many applications need to communicate with other applications to exchange data or store data in the hard disk. The .Net framework has made these tasks quite simple by including the serialization technique, which can convert objects into binary, SOAP(Simple Object Access Protocol ) or XML documents in order to provide a convenient way for storing and transferring information. Besides the three mentioned format types you can also implement custom serialization to take complete control of the serialization output.

Not yet rated with 109 hits  Added on: Sep 12, 2008

Collections in C#

Sometimes is necessary to hold more than one object in your program as an object, a part, of a bigger collection. For example, one might want to store information about each book in his possession. So, a collection which represents these books must be defined. The C# language and the .Net environment offer you numerous techniques for implementing these kinds of collections in your code. One of those techniques is by using a collection structure.

Not yet rated with 105 hits  Added on: Sep 12, 2008

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Not yet rated with 100 hits  Added on: Nov 18, 2008

Regular Expressions in C#

A regular expression’s use is for finding substrings in a large string expression. It supports the use of various wild cards and other very useful techniques for performing the required actions. The namespace System.Text.RegularExpressions contains a number of classes associated with regular expressions.

Not yet rated with 98 hits  Added on: Sep 12, 2008

Authenticating Users in C#

Unauthorized access of sensitive data must be prohibited in a business application. Unauthorized users must not be able to view other people’s information. In a windows program, sometimes it is necessary to provide different information in guests and users. A guest should not be able to see important data of the program’s flow. The authentication methods require the System.Security.Principal namespace.

Not yet rated with 98 hits  Added on: Sep 12, 2008

Sending Emails in C#

The process of sending emails is a simple one. However, because of its dependence on many factors things can become complicated. For example, if the server is not responding, the user should be able to choose whether to stop or not.

Not yet rated with 97 hits  Added on: Sep 12, 2008

The IF Statement in C#

The if statement is a so-called conditional statement. It allows you to branch your code depending on whether certain conditions are met or not. C# has two such conditional statements, the if statement and the switch statement. In this tutorial we will talk about the if statement, a frequent element of all programs.

Not yet rated with 95 hits  Added on: Sep 12, 2008

Exception Handling in C#

Every self-respected programmer should include exception handling techniques. Sometimes your application will generate an error. Regardless of who was responsible for this error, the programmer or the user, it is up to the first to include the necessary exception handling techniques to keep his/her program from crashing. The .Net environment provides useful techniques for avoiding disastrous errors such as try-catch statements and user-defined exceptions.

Not yet rated with 90 hits  Added on: Sep 12, 2008

Threading with C#

Multi-core processors are new standards on the user’s hardware. By taking advantage of the multi-processing capabilities of these machines you can achieve significant performance upgrade with some minor changes in your code. When an application does not make use of threading techniques it is wasting valuable resources. This tutorial will cover the basic threading concepts and threading methods and properties.

Not yet rated with 90 hits  Added on: Sep 12, 2008

Functions in C#

Functions are a must for modern object oriented programming and for visual programs as well. When you click a button on your mouse an event is generated. This event fires a function that is linked to that particular event. Therefore, you need to define several functions that correspond to various actions your code should perform. They are also useful when you need to call a block of code many times in different parts of your program.

Not yet rated with 72 hits  Added on: Sep 12, 2008

Reference Data Types

Reference types provide excellent flexibility and performance of large structures. This is the reason that classes are reference types and structs are data value types. As you will probably know, reference types do not store the actual value of the object but a pointer to a memory location. This pointer is stored on the stack whereas the object itself is located in the managed heap.

Not yet rated with 70 hits  Added on: Sep 12, 2008

Working with Strings in C#

The string class is designed specifically for storing and manipulating strings. Some operations of this class include conversion to lower or uppercase, removal of leading and trailing whitespace, replacing characters, comparing two strings and more. Also, a ToString() method is inherited to every object in C#, making available a string conversion of any object. Of course, this method can be overridden in your classes so that you can define the process in which this conversion takes place.

Not yet rated with 67 hits  Added on: Sep 12, 2008

Value Data Types in C#

C# distinguishes between two (2) different data types categories: value and reference types. Value data types directly store their value while reference data types store a reference to their value. Value types are stored on the stack whereas reference types are stored on the managed heap.

Not yet rated with 63 hits  Added on: Sep 12, 2008

Creating Classes in C#

Classes are a major element of every object-oriented language. If you are a promising new programmer, chances are you will create and use classes in each and every one of your programs. Classes provide templates that describe various objects, from a customer of a hotel to a new car model. In this tutorial we will talk about some basic concepts regarding their declaration methods and usage.

Not yet rated with 60 hits  Added on: Sep 12, 2008

Working with Structs in C#

Structs, similar to classes, are used to define various objects in your code. They are stored on the stack, rather than in the managed heap. This means that they are value-type objects and thus, when you pass a struct as a parameter in a function, a copy of the object is actually passed to that function. This can affect the performance of your code if you use structs for large objects. However, since the .Net does not bring in the managed heap, structs are more suitable for small objects of limited functionality and with no inheritance capabilities.

Not yet rated with 60 hits  Added on: Sep 12, 2008

FOR Loops in C#

C# provides several mechanisms for flow control in a program. The loops in C# allow you to execute a block of code repeatedly, until a certain condition is met. This condition can be the number of repetition, a variable taking a specified value or something completely different. The for loop allows you to repeatedly execute a block of code for a specified number of times.

Not yet rated with 60 hits  Added on: Sep 12, 2008

Using The PHP Include Command

The include command is used to insert the content of an external HTML page into an existing PHP page.

Not yet rated with 59 hits  Added on: Dec 11, 2008