How to use C# interface properly?
IBattleNetSettings MyInterface;
        MyInterface.Username = "MyUsername";
        BattleNetClient cs = new BattleNetClient(MyInterface);

IBattleNetSettings settings = new BattleNetSettings();

public class BattleNetSettings : IBattleNetSettings
{
    public string Username { get; set; }
    // etc...
}

IBattleNetSettings MyInterface = new BattleNetSettings();
MyInterface.Username = "MyUsername";
BattleNetClient cs = new BattleNetClient(MyInterface);