Need help with calling one class from another

[d.s.]

I've got an app with two classes, and one class (InventoryInfoC lass)
is an object within the other class (InventoryItem) . I'm running into
problems with trying to access (get/set) a private variable within the
included class (InventoryInfo) from the "including" class
(InventoryItem) .

Here's the code, trimmed down. I've included ********* at the start
of the first line that's blowing up on me. I'm sure others that try
to access the invInfo.company Name field will blow up too.

Any help please?

------------------------------------------------------------------------------------------

using System;
using System.Collecti ons.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace InventoryInfo
{
public class InventoryInfoCl ass
{
private string _companyName;
public InventoryInfoCl ass()
{
companyName = "";

}

public string companyName
{
get
{
return _companyName;
}
set
{
_companyName = value;
}
}

}

public class InventoryItem
{
private InventoryInfoCl ass invInfo;
private string _itemID;

public InventoryItem()
{
InventoryInfoCl ass invInfo = new InventoryInfoCl ass();
_itemID = "";

}

public string itemID
{
get
{
return _itemID;
}
set
{
_itemID = value;
}

}
public string companyName
{
get
{
********* return invInfo.company Name;
}

set
{
invInfo.company Name = value;
}
}
public void printInvItem()
{

Console.WriteLi ne("Company Name: {0}", this.companyNam e);
Console.WriteLi ne("Item ID: {0}", this.itemID);

Console.WriteLi ne("Press any key to continue");
Console.ReadLin e();

}

}
class InvApp
{
static void Main(string[] args)
{
InventoryItem invItem = new InventoryItem() ;

invItem.printIn vItem();

invItem.company Name = "C";

invItem.printIn vItem();
}

}

}

[=?ISO-8859-1?Q?G=F6ran_Andersson?=]

d.s. wrote:

Ok, I'm a little vague on this. Not that you're vague. I'm just not
sure how to set this up. I thought by doing the following, I was
setting up a local variable:
public class InventoryItem
{

>>>>public InventoryInfoCl ass invInfo;

private string _itemID;

No, that's a member variable. It's scope is the class.

A local variable is a variable declared inside a method, and it has the
scope of that method.

You dceclared a local variable in the constructor with the same name as
the member variable. You created an instance of the class (using the new
keyword), and assigned it's reference to the local variable.

When the constructor code ends, the local variable goes away, and with
it the reference to the instance that you created.

As you want to access the member variable, you should not create the
local variable at all.

Change this:

InventoryInfoCl ass invInfo = new InventoryInfoCl ass();

to:

invInfo = new InventoryInfoCl ass();

--
Göran Andersson
_____
http://www.guffa.com