How to make a variable accessible to the whole application?

[adodotnet20]

I'm developing a Windows application and I'm having some problems in
making variable accessible to the whole application. I use VS.NET 2005
and I create a database connection object in the method private void
connect_Click(object sender, EventArgs e). That object I create seems
to be accessible only within that method, how do I make it accessible
to the whole application, just like I have access to mytextbox.text
throughout my tabbed form? Where do you keep your connection object
usually?

Thank you.

 

[Guest]

C# does not support global variables. You can declare variables outside of
functions. These are called member variables.

class Fake
{
public int MyInt;
}

Anything accessing Fake.MyInt can read it. If you have a function in the
class, it can also read MyInt.

 

[Ben Voigt]

I'm developing a Windows application and I'm having some problems in
making variable accessible to the whole application. I use VS.NET 2005
and I create a database connection object in the method private void
connect_Click(object sender, EventArgs e). That object I create seems
to be accessible only within that method, how do I make it accessible
to the whole application, just like I have access to mytextbox.text
throughout my tabbed form? Where do you keep your connection object
usually?

You would do that with a class member variable.

You are not ready for database access if you are unfamiliar with basic
programming concepts such as scope. I suggest that you complete a tutorial
that teaches structured programming and object-oriented programming in C#
before continuing work on your application.

 

[C# Beginner]

I'm one of those guys who don't like public variables. My solution is this:
Create a database class in which you store database members such as
connectionstring property/variable, Open() methods etc. In the starting form
I create an instance of this database class. When another form needs access
to the database, I parse the instance using the tag property tag of the
form.

NewForm.Tag = (object) myDatabase;

Within the new form you can use
.... = (Database) this.tag.

hope you can use it

DD

 

[Guest]

Just add a separate class file to your application and add in all the
required fields as public with the "static" modifier.
Then you can refer to these from anywhere with "MyStuff.FieldName".
Peter