Some understanding questions...

Hi!

I am still a beginner with Java/VJ#.NET/ASP.NET, and now I have some understanding questions:

1. private, public and protected:
1.1. If I want to use my variables only inside of my class-file they must be private?
1.2. Is this correct: If I want to use variables or methods from outside the class-file thy must be public?
1.3. What means protected?

2. Sometimes I heard "If the page request is not a postback". What does this mean?

3. What means static?
3.1. I know that I could use staic variables only from staitc mehtods. But for what is "static"?

4. Exception handling with try/catch:
4.1. If I want to catch all Exceptions, I do this with "catch(Exception ex) {...}"?
4.2. Else I could specify the exact Exception "catch(OleDbException) {...}"?

Thanks for any help!!!

Greetings,
christian. 

.

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