C#

public class UserVariable<br />
{<br />
private string variableName;<br />
private object variableContent;<br />
<br />
public string VariableName<br />
	{<br />
 	get<br />
	{<br />
 return variableName;<br />
	}<br />
 	set<br />
	{<br />
 	variableName = value;<br />
	}<br />
}<br />
<br />
public string VariableContent<br />
{<br />
	 get<br />
	{<br />
 	return variableContent;<br />
	}<br />
 	set<br />
	{<br />
 	variableContent = value;<br />
	}<br />
}<br />
<br />
public UserVariable(string name,object content)<br />
{<br />
 	this.variableName = name;<br />
 	this.variableContent = content;<br />
}<br />
 <br />
// automatically write the content of the variable when used in<br />
// a string.Format<br />
<br />
public override string ToString()<br />
{<br />
	return string.Format("{0}",variableContent);<br />
}<br />
}

class User
{
    // Private fields, and properties to access user information.
    // The properties could also have setters if you have a Save method
    // that will persist the changes to the database.
    private int id;
    private string name;
 
    public int Id
    {
        get { id; }
    }
 
    public string Name
    {
        get { return name; }
    }
 
    // Constructor that gets the info for one customer
    public User(int id)
    {
        // Load id and name from database
        ....
    }
 
    // Static methods and properties for current logged in user
    static private User current;
 
    // Static property to return currently-logged in user. Since the field
    // is private, it can't be created from the outside.
    public static User Current
    {
        get { return current; }
    }
 
    // Call this method to try to login a user.
    public static bool LogIn(string userName, string password)
    {
        // Try to find a record in the database with the specific user name and
        // password

        if(found)
        {
            current = new User(foundId);
            return true;  // User logged in
        }
 
        return false;  // No user logged in
    }

    public static void Logout()
    {
        current =  null;
    }
}

if(User.Current != null)
    sbpUserName.Text = User.Current.Name;  // Display in status bar
else
    sbpUserName.Text = "(please log in)";