menu driven program in vb

Private Sub cmdClear_Click()
    Text1.Text = ""
    Text2.Text = ""
    Text3.Text = ""
    Text1.SetFocus
End Sub

Private Sub cmdExit_Click()
    Unload Me
End Sub

Private Sub mnuadd_Click()
    Text3.Text = Val(Text1.Text) + Val(Text2.Text)
End Sub

Private Sub mnuDiv_Click()
    Text3.Text = Val(Text1.Text) / Val(Text2.Text)
End Sub

Private Sub mnuMult_Click()
    Text3.Text = Val(Text1.Text) * Val(Text2.Text)
End Sub

Private Sub mnusub_Click()
    Text3.Text = Val(Text1.Text) - Val(Text2.Text)
End Sub

Output:-

INTERNET INTRANET EXTRANET

What is Internet ?

It is a Global network of computers, (servers or clients) to exchange information.
It is a "network of networks" that includes millions of  private and public, academic, business, and government networks (local or Global),
linked by copper wires, wireless connections, and other technologies.

Hardware and Software of Internet

Variety of hardware and software are used to make Internet functional.

• Modem

Device that enables computers to communicate through phone lines.
When we start internet the our modem communicates to modem of ISP.

• Computer

In addition to a modem, you need a client capable of handling multiple data types.

• Software

Two types of software’s required to enable your PC as an Internet PC.
        Communication software to establish connection
        Client software for browsing, e-mail, news.
        these software’s are provided with windows itself

Applications Of Internet :-

1. Download programs and files
2. E-Mail
3. Voice and Video Conferencing
4. E-Commerce
5. File Sharing
6. Information browsing
7. Search the web addresses for access through search engine
8. Chatting and many more…

Disadvantages of Internet:-

1. Theft of personal information such as name, address, credit card number etc.
2. Virus threats nothing but a program which disrupts the normal functioning of your system.
3. Spamming refers to receiving unwanted e-mails in bulk, which provide no purpose and needlessly obstruct the entire system.
4. Pornography This is perhaps the biggest threat related to children’s healthy mental life. A very serious issue concerning the Internet. 

Though, internet can also create havoc, destruction and its misuse can be very fatal, the advantages of it outweigh its disadvantages