things in vb.net

hi vb.net experts..
i've some questions in vb.ent because i am still fresh :
1-what does (imports system) mean ? when i should use it ?
2- what does(shared sub main()) mean ? what's difference between sub main() and shared sub main()?
3-what is difference between Private and Public ?
4-when i convert the file.vb to vb.exe can i run it anywhere without installing the dot net framework ?

rammaaAsked:
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Bob LearnedConnect With a Mentor Commented:
(1)  Adjusting your scope - A look into variable scopes in .NET
http://www.andreavb.com/forum/news/viewtopic_3361.html

http://www.startvbdotnet.com/language/lang1.htm

(2) http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=158&lngWId=10
     Look for the explanation of Shared code

(3) The .NET framework, namely the CLR (Common Language Runtime), is required to run any VB.NET program:

Introduction to the Common Language Runtime in VB.NET
http://www.freevbcode.com/ShowCode.asp?ID=2027

Bob
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Bob LearnedCommented:
(1)  Imports helps so you don't have to make full references to objects and methods:  System.Windows.Forms.Application.ExecutablePath

      You can use multiple imports:

      Imports System
      Imports System.Windows
      Imports System.Windows.Forms
      Imports System.Windows.Forms.Application

(2)  A shared function in a class doesn't require an instance of that class to perform that function (i.e. String.Format).  With Shared Sub Main, you have have a class as the only file in a project, and provide an entry point to the library.

(3)  Private, Public, and Friend are scope parameters for variables, properties, and methods.  It gives you the ability to show or hide details to a specific class.

(4) All .NET programs require the framework to run.

Bob
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rammaaAuthor Commented:
Hi Bob..
* i still can't understand precisely the difference between the public ,private and friend ! when should i use each of them?
* what is the difference between sub main() and shared sub main() ?
* Finally Please correct if i was wrong wrong :
 If i made a vb.net application and converted it to exe file this program can't be executed into my friends pc unless they installed the dot net framework on thier machines!
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rammaaAuthor Commented:
thanks Bob
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Bob LearnedCommented:
You welcome:)

Bob
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