C# (C sharp) and Visual Basic.NET

C# and VB.NET are syntactically very different languages with very different history. As the name suggests, the C# syntax is based on the core C language originally developed by Bell Labs (AT&T) in the 1970s and eventually evolved into the fully object oriented C++ language still in use today. Much of the Java syntax is also based on this same C++ language,which is one of the reasons the two share a common look and feel. See Comparison of Java and C Sharp for more on this topic.

VB.NET has its roots in the BASIC language of the '60s with its name being an acronym for "Beginner's All-purpose Symbolic Instruction Code". In its beginning, BASIC was used in the college community as a "basic" language for first exposure to computer programming and the acronym represented the language accurately. In the '70s, the language was picked up by microcomputer manufacturers of the era to be used as both a simple ROM embedded programming language as well as a quasi operating system for input/output control. In the early '80s, the language was picked up by Microsoft and expanded significantly beyond its original intent into their "Visual Basic" language/platform that was sold throughout the 1990s as a "rapid application development" (RAD) tool for Windows programming. It competed directly against other RAD tools of the 1990s such as PowerBuilder. Even though Visual Basic was a successful development platform, it was discontinued after its 6th version (VB6) when Microsoft introduced the .NET Framework and its related Visual Studio development platform in the early 2000s.

According to the Microsoft :

"Because of the previous differences between Visual Basic and C/C++, many developers assume incorrectly about the capabilities of Visual Basic .NET. Many Visual Basic developers think that Visual C# is a more powerful language than Visual Basic. In other words, Visual Basic developers assume that you can do many things in Visual C# that you cannot do in Visual Basic .NET, just as there are many things that you can do in C/C++ but cannot do in Microsoft Visual Basic 6.0 or earlier. This assumption is incorrect."

The "Differences Between Microsoft Visual Basic .NET and Microsoft Visual C# .NET" white paper describes some of the differences between Visual Basic .NET and Visual C# .NET. However, remember that the .NET Framework is intended to be language independent. When you must select between Visual Basic .NET and Visual C# .NET, decide primarily based on what you already know and what you are comfortable with. It is easier for Visual Basic 6.0 developers to use Visual Basic .NET and for C++/Java programmers to use Visual C# .NET. The existing experience of a programmer far outweighs the small differences between the two languages.

What you know about Anti Virus software?

Antivirus software gives protection against the viruses and Malware. Antivirus can detect the malicious software ,then delete or put it in quarantine. The process behind the Anti VirusThe Antivirus follows two methods to detect the malicious software. They are
- Virus Dictionary Based Detection
- Suspicious Activity Detection

- Virus Dictionary Based Detection: In this method, Antivirus manage a dictionary file which has the identified virus signatures. Whenever an executable is running, antivirus will check the executable file source code with the dictionary. If the source code match with any virus signature, then antivirus will immediately inform you that the virus is found.Antivirus will check the executable file whenever file is opened or created or emailed or downloading.

Example: Let us assume the malicious code is "11010011" and this code is in dictionary file. If any executable file runs with the above malicious code, the antivirus immediately block and alerts the user. Day to day the hackers can create new viruses, the source code of virus will vary. The antivirus can not detect the virus with old Signature of viruses. You have to update the virus signature so that it can detect new viruses.

Drawback of this Method : Hackers found a hacking trick to bypass this security method, The Crypter. Yes, hackers can encrypt the source code into different source code such that it will look like safest source code. So if the antivirus checks for the source code, it won't find the malicious code (because it is another form). (I will give detailed explanation about the crypter in my next post.). The drawback can be solved by including the crypted malicious code to dictionary file.

- Suspicious Activity Detection : The suspicious activity detection method is more effective than the Dictionary based approach. It can detect even a new virus. Antivirus observes the behavior of the executable file. If the executable file does any illegal process or create any executable file, the antivirus will block the executable file and alert the user .

Drawback : It is annoying process. The accuracy is less so it may detect any safe executable file as virus.

Hope You understand something about the Antivirus programms. :-)

SQL SERVER 2000, 2005 and 2008

SQL SERVER 2000:
1.Query Analyser and Enterprise manager are separate.
2.No XML datatype is used.
3.We can create maximum of 65,535 databases.
4.Nill
5.Nill
6.Nill
7.Nill
8.Nill
9.Nill
10.Nill
11.Nill
12.Nill
13.cant compress the tables and indexes.
14.Datetime datatype is used for both date and time.
15.No varchar(max) or varbinary(max) is available.
16.No table datatype is included.
17.No SSIS is included.
18.CMS is not available.
19.PBM is not available.

SQL SERVER 2005:

1.Both are combined as SSMS(Sql Server management Studio).
2.XML datatype is introduced.
3.We can create 2(pow(20))-1 databases.
4.Exception Handling
5.Varchar(Max) data type
6.DDL Triggers
7.DataBase Mirroring
8.RowNumber function for paging
9.Table fragmentation
10.Full Text Search
11.Bulk Copy Update
12.Cant encrypt
13.Can Compress tables and indexes.(Introduced in 2005 SP2)
14.Datetime is used for both date and time.
15.Varchar(max) and varbinary(max) is used.
16.No table datatype is included.
17.SSIS is started using.
18.CMS is not available.
19.PBM is not available.

SQL SERVER 2008:
1.Both are combined as SSMS(Sql Server management Studio).
2.XML datatype is used.
3.We can create 2(pow(20))-1 databases.
4.Exception Handling
5.Varchar(Max) data type
6.DDL Triggers
7.DataBase Mirroring
8.RowNumber function for paging
9.Table fragmentation
10.Full Text Search
11.Bulk Copy Update
12.Can encrypt the entire database introduced in 2008.
--check it(http://technet.microsoft.com/en-us/library/cc278098(SQL.100).aspx)
(http://www.sqlservercentral.com/articles/Administration/implementing_efs/870/)
(http://www.kodyaz.com/articles/sql-server-2005-database-encryption-step-by-step.aspx)
(http://www.sql-server-performance.com/articles/dev/encryption_2005_1_p1.aspx)
(http://geekswithblogs.net/chrisfalter/archive/2008/05/08/encrypt-documents-with-sql-server.aspx)
13.Can compress tables and indexes.
-http://www.mssqltips.com/tip.asp?tip=1582
14.Date and time are seperately used for date and time datatype,geospatial and timestamp with internal timezone
is used.
15.Varchar(max) and varbinary(max) is used.
16.Table datatype introduced.
17.SSIS avails in this version.
18.Central Management Server(CMS) is Introduced.
-http://msdn.microsoft.com/en-us/library/bb934126.aspx
-http://www.sqlskills.com/BLOGS/KIMBERLY/post/SQL-Server-2008-Central-Management-Servers-have-you-seen-these.aspx
19.Policy based management(PBM) server is Introduced.
-http://www.mssqltips.com/tip.asp?tip=1492
-http://msdn.microsoft.com/en-us/library/bb510667.aspx

Introduction to Computer

A computer is a machine that receives instructions and produces a result after performing an appropriate assignment. Since it is a machine, it expects good and precise directives in order to do something. The end result depends on various factors ranging from the particular capabilities of the machine, the instructions it received, and the expected result.

As a machine, the computer cannot figure out what you want. The computer doesn't think and therefore doesn't make mistakes.
Computer programming is the art of writing instructions (programs) that ask the computer to do something and give a result. A computer receives instructions in many different forms, four of which are particularly important.

The first instructions are given by the manufacturers of various hardware parts such as the microprocessor, the motherboard, the floppy and the CD-ROM drives, etc. These parts are usually made by different companies, setting different and various goals that their particular part can perform. The instructions given to the microprocessor, for example, tell it how to perform calculations, at what speed, and under which circumstances. The instructions given to the motherboard tell it to behave like a city where people and cars can move from one part of the town to another, back and forth, for various reasons; this allows information to flow from one part of the city, I mean one section of the computer, to another.

Once the instructions given to the hardware parts are known, software engineers use that information to give the second sets of instructions to the computer. These instructions, known as an operating system, are usually written by one company. These second instructions tell the computer how to coordinate its different components so the result will be a combination of different effects. This time, the computer is instructed about where the pieces of information it receives are coming from, what to do with them, then where to send the result. This time also the operating system designers impose a lot of behaviors to the computer as a machine. Again this time, some computer languages are developed so that programmers can write applications as the third set of instructions. It is like developing languages that people in a city can use to talk to each other. Consider that from now on (once the OS is developed), people get into the habit of doing things according to their particular culture or taste, speaking different languages that their neighbor doesn't understand... Luckily, the computer, I should say the OS, understands all these languages (I can't guaranty that). Some of the operating systems on the market are: Microsoft Windows 3.X, Corel Linux, IBM OS\2, Microsoft Windows 9X, Apple OS 10, Red Hat Linux, Microsoft Windows Millennium, BeOS, Caldera Linux, Microsoft Windows 2000 etc. A particular OS (for example Microsoft Windows 98) depending on a particular processor (for example Intel Pentium) is sometimes referred to as a platform. Some of the computer languages running on Microsoft Windows operating systems are C++, Pascal, Basic, and their variants.

The actual third set of instructions are given to the computer by you, the programmer, using one or more of the languages that the operating system you are planning to use can understand. Your job is going to consist of writing applications. As a programmer, you write statements such as telling the computer, actually the operating system, that "If the user clicks this, do the following, but if he clicks that, do something else. If the user right clicks, display this; if he double-clicks that, do that." To write these instructions, called programs, you first learn to "speak" one of the languages of the OS. Then, you become more creative... Some of the application programs in the market are Microsoft Word, Lotus ScreenCam, Adobe Acrobat, Jasc Paint Shop Pro, etc.

The last instructions are given by whoever uses your program, or your application. For example, if you had programmed Microsoft Word, you would have told the computer that "If a user clicks the New button on the Standard toolbar, I want you to display a new empty document. But if the user clicks File -> New..., I want you to 'call' the New dialog and provide more options to create a new document. If the same user right-clicks on any button on any of the toolbars, I want you to show, from a popup menu, all the toolbars available so she can choose which one she wants. But if she right-clicks on the main document, here is another menu I want you to display."
At this time, you have probably realized that the users of your programs depend on your techniques as a developer to provide an easy to use application (that's what recruiters and employers call experience and creativity). You depend on the computer language that you are actually using (every computer language has its ups and downs). Your computer language depends on the operating system it is running on (different
operating systems have different strengths and weaknesses). The operating system depends on the microprocessor or the machine it is running in (the biggest difference between two microprocessors is the speeds at which each processes information).

Your interest here is on the computer languages, since you are going to write programs. There are various computer languages, for different reasons, capable of doing different things. Fortunately, the computer can distinguish between different languages and perform accordingly. These instructions are given by the programmer who is using compilers, interpreters, etc, to write programs. Examples of those languages are Basic, C++, Pascal, etc.

Why use Google Chrome

The web browser is arguably the most important program on your computer. That's why we built a browser with everything you need to make the most of the web.

Speed

Chrome is designed to be fast in every possible way. It's fast to start up, fast to search and load web pages, and fast to run all your web apps.

Security

Chrome is built to help you browse more safely and securely on the web. Chrome's sandboxing, Safe Browsing, and auto-update technologies help protect you against phishing and malware attacks.

Simplicity

Chrome's browser window is streamlined, clean and simple. Its combined search and address bar makes it easy to search and navigate the web, all from one box.

Chrome Web Store

The Chrome Web Store is an online marketplace where you can discover thousands of apps, extensions, and themes for Chrome.

Introduction to Computer Database

-A database is a collection of information that is organized so that it can easily be accessed, managed, and updated.

- A Database is a collection of related information about a system or an object.

-A database is a collection of information organized as to make it easy to view it, search it, retrieve the right detail, and collects the necessary facts in an easier, timely, and effortless manner as possible.

- A database is a collection of related information stored so that it is available to many users for different purpose.

- Purpose of the database is to share the resources (data) to all users, and redundant data can be eliminated or at least minimized.

- It is a collection of interrelated stored data that serves the needs of multiple users within one or more organization that is interrelated collections of many different types of tables.