Global Class to access Variables

If you really need global access to a single instance, use the Singleton pattern.
http://msdn.microsoft.com/en-us/library/ff650316.aspx[^].

This is one of the ways to implement singleton behavior without having a static class:

class Singleton {
    public Singleton() { } //prevent instantiation from outside
    public static Singleton Instance {
        get {
            if (SingleInstance == null) //keep it lazy
                SingleInstance = new Singleton();
            return SingleInstance;
        }
    }
    public int FirstProperty { get; set; }
    public string SecondProperty { get; set; }
    public void Run() { /*...*/ }
    //...
    private static Singleton SingleInstance;
}

All access if performed via static Singleton.Instance which guarantee both global access and uniqueness (withing Application Domain).

For static data it's very important to secure thread safety using locking, in case of more than one thread having access to the singleton.
Alternatively, volatile keyword can be used.
See: http://msdn.microsoft.com/en-us/library/x13ttww7(v=VS.100).aspx[^], http://www.dotnetperls.com/volatile[^].

—SA