Where to declare Public variable

[esha]

I need to have a Public variable in my project. In VB it can be declared in
a standard module. Where can I do it in C# ?
I tried to do it in default class Program.cs and I tried it in an added by
me class.
No success

So, how and where I declare a variable visible by any module in the project?

Esha

[Arne Vajhøj]

esha wrote:

I need to have a Public variable in my project. In VB it can be declared in
a standard module. Where can I do it in C# ?
I tried to do it in default class Program.cs and I tried it in an added by
me class.
No success

So, how and where I declare a variable visible by any module in the project?

Quick solution:

public class Globals
{
public SomeClass Varname;
}

can be used as Globals.Varname

Better solution:

look at singleton pattern or another way of restructuring,
because the first one is not good OOP

Arne

[Michael C]

"Arne Vajhøj" <ar**@vajhoej.d kwrote in message
news:UQ%Ng.3783 1$_q4.15928@duk eread09...

You forgot the static

public class Globals
{
public static SomeClass Varname;
}

Michael

[Arne Vajhøj]

Michael C wrote:

"Arne Vajhøj" <ar**@vajhoej.d kwrote in message

>public class Globals
{
public static SomeClass Varname;
}

You forgot the static

It is optional in 2.x+ and not valid in 1.x.

You may argue, that it is good style, but nothing
else in that class is so ...

Arne

[esha]

I'm still confused. I tried many ways and nothing works.
Could you please give me translation for these 2 blocks of code from VB to
C#:

Imports System.Data.Sql Client

Module GlobalDataStuff

Public objConn As SqlConnection

End Module

'The second block let's say in the Form module:

Private Sub Form1_Load(ByVa l sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load

objConn = New SqlConnection

objConn.Connect ionString = "Data Source=DELLNEW; Initial Catalog=SRSNew; User
ID=administrato r;Password=deve loper;"

objConn.Open()

End Sub

Thank you

Esha

"Arne Vajhøj" <ar**@vajhoej.d kwrote in message
news:UQ%Ng.3783 1$_q4.15928@duk eread09...

esha wrote:

>I need to have a Public variable in my project. In VB it can be declared
in a standard module. Where can I do it in C# ?
I tried to do it in default class Program.cs and I tried it in an added
by me class.
No success

So, how and where I declare a variable visible by any module in the
project?

Quick solution:

public class Globals
{
public SomeClass Varname;
}

can be used as Globals.Varname

Better solution:

look at singleton pattern or another way of restructuring,
because the first one is not good OOP

Arne

[Arne Vajhøj]

esha wrote:

I'm still confused. I tried many ways and nothing works.
Could you please give me translation for these 2 blocks of code from VB to
C#:

Imports System.Data.Sql Client

Module GlobalDataStuff

Public objConn As SqlConnection

End Module

'The second block let's say in the Form module:

Private Sub Form1_Load(ByVa l sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load

objConn = New SqlConnection

objConn.Connect ionString = "Data Source=DELLNEW; Initial Catalog=SRSNew; User
ID=administrato r;Password=deve loper;"

objConn.Open()

End Sub

using System.Data.Sql Client;

public class GlobalDataStuff
{
public static SqlConnection objConn;
}

and

GlobalDataStuff .objConn = new SqlConnection() ;
GlobalDataStuff .objConn.Connec tionString = "...";

but this is not good code.

You should reorganize your code to be object oriented.

Arne

[esha]

Thank you Arne.
I'm the very beginner. I know VB 2005 a little bit and I just wanted to
start somewhere with C#. I couldn't find the way to declare and use public
variables.
Comparing to VB the code you gave me doesn't look better than in VB. Here I
have to give the name of the class where the varible was declared. In VB the
variable declared in a standard module can be used anywhere without naming
the module.
Is there any way to avoid names of the classes?
Another question: How should look the code to be OO? I'm asking about my
sample.

Esha

"Arne Vajhøj" <ar**@vajhoej.d kwrote in message
news:qg1Og.3783 8$_q4.13221@duk eread09...

esha wrote:

>I'm still confused. I tried many ways and nothing works.
Could you please give me translation for these 2 blocks of code from VB
to C#:

Imports System.Data.Sql Client

Module GlobalDataStuff

Public objConn As SqlConnection

End Module

'The second block let's say in the Form module:

Private Sub Form1_Load(ByVa l sender As System.Object, ByVal e As
System.EventAr gs) Handles MyBase.Load

objConn = New SqlConnection

objConn.Connec tionString = "Data Source=DELLNEW; Initial
Catalog=SRSNew ;User ID=administrato r;Password=deve loper;"

objConn.Open ()

End Sub

using System.Data.Sql Client;

public class GlobalDataStuff
{
public static SqlConnection objConn;
}

and

GlobalDataStuff .objConn = new SqlConnection() ;
GlobalDataStuff .objConn.Connec tionString = "...";

but this is not good code.

You should reorganize your code to be object oriented.

Arne

[Bruce Wood]

Arne Vajhøj wrote:

Michael C wrote:

"Arne Vajhøj" <ar**@vajhoej.d kwrote in message

public class Globals
{
public static SomeClass Varname;
}

>
You forgot the static

It is optional in 2.x+ and not valid in 1.x.

You may argue, that it is good style, but nothing
else in that class is so ...

Not true. Michael was referring to the "static" keyword on the field
declaration, which is required if you want a "global variable".

It is the "static" keyword on the _class_ declaration that is new (and
optional) in 2.0.

[Arne Vajhøj]

Bruce Wood wrote:

Arne Vajhøj wrote:

>Michael C wrote:

>>"Arne Vajhøj" <ar**@vajhoej.d kwrote in message
public class Globals
{
public static SomeClass Varname;
}

You forgot the static

It is optional in 2.x+ and not valid in 1.x.

You may argue, that it is good style, but nothing
else in that class is so ...

Not true. Michael was referring to the "static" keyword on the field
declaration, which is required if you want a "global variable".

Oops.

Egg on my face.

My apologies.

Arne

[Arne Vajhøj]

esha wrote:

I'm the very beginner. I know VB 2005 a little bit and I just wanted to
start somewhere with C#. I couldn't find the way to declare and use public
variables.
Comparing to VB the code you gave me doesn't look better than in VB. Here I
have to give the name of the class where the varible was declared. In VB the
variable declared in a standard module can be used anywhere without naming
the module.
Is there any way to avoid names of the classes?
Another question: How should look the code to be OO? I'm asking about my
sample.

It is an advantage that you have to specify the class name. It
makes it easier to find the declaration.

No. Everything in C# is classes (or struct or interface or enum).

You could create a singleton for that connection.

But there are something wring with the whole idea of having
just one database connection.

The code should be redesigned so that it works in a multi
threaded context.

The connection should be a non static member of a class
or a local variable.

Arne