Public Class

Nooie

Hi all, I am still very new to C#. I have created a Windows Application in VS2005, and added a new class (Class1) that I created. I've then added another Form to the Application. My problem is that I want to declare the Class (Class1) so that I can use it in both Forms. Where about's in the Application would I do this please? Many Thanks Tony

Colin Angus Mackay

Nooie wrote:

Application

You are using "Application" as a proper noun here. Is there any significance in that? Or should the initial "A" be lowercased back to a common noun?

Nooie wrote:

My problem is that I want to declare the Class (Class1) so that I can use it in both Forms. Where about's in the Application would I do this please?

It really depends on what you want to do with the class. Class1 is not a very good name, it doesn't decribe what the class represents. You could create an instance of the class in the first form then pass it to the second form in its constructor (you'll have to modify the constructor of the second form to accomodate the object). Or you could do one of many other things. What is the purpose of Class1?

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Nooie

Hi Sorry I was using simple names to try and no over complicate it. Basically I created a new windows form project using VS2005. I then created a new Class called NavConnection. This class contains details such as Servername, databasename etc... Next I added application settings which match the props in the class NavConnection. From the Main Form I added a new MenuStrip and a call to a new form I created. On the new form I have textboxes that mimic the Usersettings/Navconnection. The idea being that when this form is run it will populate the textbox's with the data from the class. Then when the app is closed the User Settings will be saved from the Class NavConnection. So when I run the app I want to create an instance that it used through out the app. Does that make more sense? It may not be the best way to do this but I am inventing little projects to help learn C# Cheers for your help. Tony

Christian Graus

You need to create an instance of your class as a member. As in NavConnection conn = new NavConnection();

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Nooie

Hi Christian, Thats kind of what I was asking ;-) where do I put it? I've tried a few places, but when I go to code on the second form using the instance conn, intellisense does not pick it up. Tony

phantanagu

Hi, You write "public static MyClass myClass1 = new MyClass () outside "Form1_Load()" or "Form2_Load()" to use in both forms. Hope my help.

Colin Angus Mackay

Public fields are generally a bad idea.

Upcoming events: * Edinburgh: Web Security Conference Day for Windows Developers (12th April) * Glasgow: Introduction to AJAX (2nd May), SQL Server, Mock Objects Never write for other people. Write for yourself, because you have a passion for it. -- Marc Clifton My website

Colin Angus Mackay

NavConnection sounds like it should be a Singleton (i.e. There exists only one instance of it in the application) If that is correct, you can create the class as static (i.e. put static on its class definition and all fields, properties and methods). Then you don't need to store an instance of the class anywhere. You can reference a method on it like this:

NavConnection.ServerName;
NavConnection.SaveSettings();

The class might look something like this:

public static class NavConnection
{
private static string serverName;

public static string ServerName
{
    get { return this.serverName; }
    set { this.serverName = value; }   
}

public static void SaveSettings()
{
    // Put code to save the settings in here.
}

}

Upcoming events: * Edinburgh: Web Security Conference Day for Windows Developers (12th April) * Glasgow: Introduction to AJAX (2nd May), SQL Server, Mock Objects Never write for other people. Write for yourself, because you have a passion for it. -- Marc Clifton My website