C#

public class MyClass {
  public int data;
  
  public MyClass() { }
}

public void Tests() {
  MyClass foo = new MyClass();
  foo.data = 1;

  System.Console.WriteLine("foo = {0}", foo.data);

  MyClass bar = new MyClass();
  bar.data = 2;

  System.Console.WriteLine("foo = {0}", foo.data);
  System.Console.WriteLine("bar = {0}", bar.data);
}

C:\Documents and Settings\gavin\My Documents\Visual Studio Projects\LTBRMaintenance\EditUser.cs(202): Static member 
'LTBRMaintenance.Database.StaffNames' cannot be accessed with an instance reference; qualify it with a type name instead

//Database.cs
public class Database
{
public static string[] StaffNames;

//EditUser.cs
Database sn = new Database();
int uBound = sn.StaffNames.GetUpperBound(0);

MyControl c = new MyControl();

// set the properties for the control

this.Controls.Add(c);