tell me how to use constructor in .net applcations.

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can anyone please guide me about the true functionalty of a constructor.
I studied it from the lots of places but still cannot understand completely when it is used.
Please give some example how we can use them in .net application and when it is sufficient to use them.

Posted 2-Mar-11 1:33am

codegeekalpha

Updated 2-Mar-11 1:36am

m@dhu

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OriginalGriff · Answer 1 · 2011-03-02T01:42:00

You use a constructor whenever you create an instance of a class.

So whenever you see the new keyword, you are looking at a call to a constructor. It may be a default constructor, with no visble code, but it will be called.

Since everything in C# is derived from a single class (the object class) everything you use in you application has a constructor which is called when the instance is created, where it is a string, a Form, or a SQL database connection.

What do you do with a constructor? Set up your instance so that it will work if nothing else is done to it. Or set up internal fields via parameters.

This is a big subject, and difficult to cover at a large remove. I would suggest that you ask your tutor: he will at least be able to see your reactions and explain confusing parts again.

CPallini · Answer 2 · 2011-03-02T01:42:00

It is used to initialize the state of the object itself (either using passed parameters or default values). I.e. it is an opportunity, for the developer, to put the object in a well known state, before it is actually used.
Suppose you're coding your own Stack class. Probably it has a tos (top of the stack) member variable. The Stack class constructor should set tos=0, putting the object in a well know state (empty stack) after contruction.
:)

Wild-Programmer · Answer 3 · 2011-03-02T01:39:00

For every class an empty constructor will be defined automatically by default unless you provide a constructor definition manually. Constructor in a class can be used to initialize variables or perfrom some basic functionallity whenever an object is created.

For examples you can search google. There are lots of them.

Sergey Alexandrovich Kryukov · Answer 4 · 2011-03-02T07:10:00

This question is very inappropriate.

Is is simply not practical to ask question like that. I means your knowledge is still too premature; so you need to read and learn by you own first, which is much more effective on your level. After some learning, you will be ready to get much more effective help from Questions and Answers.

Please see my recommendations here: I have a problem with my program. Please help![^].

—SA

tell me how to use constructor in .net applcations.

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