Object Visibility, whats the best way?

[dgleeson3]

Hello All

I have three classes Form1, DataBase_Manage r and Users.
Form 1 creates two object of type DataBase_Manage r and Users as below.

Public Class Form1
Inherits Form

Public DataBase_Manage r1 As New DataBase_Manage r
Public User1 As New Users
My idea is that the DataBase_Manage r1 object handles all database
interactions. The User1 object needs data from the database and must
ask the DataBase_Manage r1 for the data.

So the user class has a function which needs to call a function in the
DataBase_Manage r1 to have it retrieve the required data. How do I make
the functions in DataBase_Manage r1 visible to the object User1. And
what is the best OO way of doing this in VB.NET

Many thanks for all replies.

Denis

[rowe_newsgroups]

On Aug 15, 12:40 pm, dglees...@eirco m.net wrote:

Hello All

I have three classes Form1, DataBase_Manage r and Users.
Form 1 creates two object of type DataBase_Manage r and Users as below.

Public Class Form1
Inherits Form

Public DataBase_Manage r1 As New DataBase_Manage r
Public User1 As New Users

My idea is that the DataBase_Manage r1 object handles all database
interactions. The User1 object needs data from the database and must
ask the DataBase_Manage r1 for the data.

So the user class has a function which needs to call a function in the
DataBase_Manage r1 to have it retrieve the required data. How do I make
the functions in DataBase_Manage r1 visible to the object User1. And
what is the best OO way of doing this in VB.NET

Many thanks for all replies.

Denis

If the Users class is going to consume the DataBase_Manage r class, it
should have it's own instance of the class. Why not just add a
DataBase_Manage r to the Users class?

Also, assuming it won't break any inheritance chains you could just
have Users inherit from DataBase_Manage r giving it a copy of all it's
methods/properties.

Another option would be to make the methods in DataBase_Manage r shared
(static in C#) so any class can call the methods without needing to
instantiate the class first.
Thanks,

Seth Rowe

[Jack Jackson]

On Wed, 15 Aug 2007 09:40:28 -0700, dg*******@eirco m.net wrote:

>Hello All

I have three classes Form1, DataBase_Manage r and Users.
Form 1 creates two object of type DataBase_Manage r and Users as below.

Public Class Form1
Inherits Form

Public DataBase_Manage r1 As New DataBase_Manage r
Public User1 As New Users
My idea is that the DataBase_Manage r1 object handles all database
interactions . The User1 object needs data from the database and must
ask the DataBase_Manage r1 for the data.

So the user class has a function which needs to call a function in the
DataBase_Manag er1 to have it retrieve the required data. How do I make
the functions in DataBase_Manage r1 visible to the object User1. And
what is the best OO way of doing this in VB.NET

Many thanks for all replies.

Denis

If Database_Manage r is not needed in the form except for use by Users,
put it in Users. You can do that anyway if it would work to have two
copies of Database_Manage r.

If you want only one copy in the form, then you need to pass the
reference to Database_Manage r to Users. You can do that with a
parameter on the Users constructor (New()) or by calling a method in
Users from the Form code after both are instantiated.

[dgleeson3]

Hi Guys

Thanks for the suggestions.
I think your second suggestion is the most appropriate Jack.

Thanks

Denis

On Aug 15, 6:36 pm, Jack Jackson <jacknos...@peb bleridge.comwro te:

On Wed, 15 Aug 2007 09:40:28 -0700, dglees...@eirco m.net wrote:

Hello All

I have three classes Form1, DataBase_Manage r and Users.
Form 1 creates two object of type DataBase_Manage r and Users as below.

Public Class Form1
Inherits Form

Public DataBase_Manage r1 As New DataBase_Manage r
Public User1 As New Users

My idea is that the DataBase_Manage r1 object handles all database
interactions. The User1 object needs data from the database and must
ask the DataBase_Manage r1 for the data.

So the user class has a function which needs to call a function in the
DataBase_Manage r1 to have it retrieve the required data. How do I make
the functions in DataBase_Manage r1 visible to the object User1. And
what is the best OO way of doing this in VB.NET

Many thanks for all replies.

Denis

If Database_Manage r is not needed in the form except for use by Users,
put it in Users. You can do that anyway if it would work to have two
copies of Database_Manage r.

If you want only one copy in the form, then you need to pass the
reference to Database_Manage r to Users. You can do that with a
parameter on the Users constructor (New()) or by calling a method in
Users from the Form code after both are instantiated.- Hide quoted text -

- Show quoted text -

[rowe_newsgroups]

On Aug 16, 7:28 am, dglees...@eirco m.net wrote:

Hi Guys

Thanks for the suggestions.
I think your second suggestion is the most appropriate Jack.

Thanks

Denis

On Aug 15, 6:36 pm, Jack Jackson <jacknos...@peb bleridge.comwro te:

On Wed, 15 Aug 2007 09:40:28 -0700, dglees...@eirco m.net wrote:

>Hello All

>I have three classes Form1, DataBase_Manage r and Users.
>Form 1 creates two object of type DataBase_Manage r and Users as below.

>Public Class Form1
Inherits Form

Public DataBase_Manage r1 As New DataBase_Manage r
Public User1 As New Users

>My idea is that the DataBase_Manage r1 object handles all database
>interactions . The User1 object needs data from the database and must
>ask the DataBase_Manage r1 for the data.

>So the user class has a function which needs to call a function in the
>DataBase_Manag er1 to have it retrieve the required data. How do I make
>the functions in DataBase_Manage r1 visible to the object User1. And
>what is the best OO way of doing this in VB.NET

>Many thanks for all replies.

>Denis

If Database_Manage r is not needed in the form except for use by Users,
put it in Users. You can do that anyway if it would work to have two
copies of Database_Manage r.

If you want only one copy in the form, then you need to pass the
reference to Database_Manage r to Users. You can do that with a
parameter on the Users constructor (New()) or by calling a method in
Users from the Form code after both are instantiated.- Hide quoted text -

- Show quoted text -

One other option is to make the Database_Manage r implement the
Singleton pattern. That way all consumers of the class will be using
the same instance of the Database_Manage r.

Thanks,

Seth Rowe