C#

object A = new object();
// The goal of the next line is to ensure that object.ReferenceEquals(A, B) is ALWAYS true
// I know this doesn't compile, but is there some way to do this?
object B = ref A;
// Now, after the prior statement (whatever it is), setting EITHER A or B changes BOTH A and B
B = new object();
// At this point object.ReferenceEquals(A, B) should still be true

Engine newEngine = new Engine(200, "PS");
Engine oldEngine = null;

oldEngine = Car.Engine; // store old engine of this car
Car.Engine = newEngine; // give this car a new engine
... // do something with this engine
Car.Engine = oldEngine; // put back the old engine

<br />
            Assembly assembly = Assembly.LoadFrom(@"C:\somecrazypath\bin\Debug\whatever.dll");<br />
            foreach (Type type in assembly.GetTypes())<br />
            {<br />
                if (type.GetInterface("IMyInterface") == null)<br />
                {<br />
                    continue;<br />
                }<br />
<br />
                // If it implements IMyInterface,<br />
                // create an instance of the object<br />
                object ibaseObject = Activator.CreateInstance(type);<br />
                LoadedModules.Add((IMyInterface)ibaseObject);<br />
            }<br />

<br />
AppDomainSetup ads = new AppDomainSetup();<br />
ads.PrivateBinPath += @"C:\somecrazypath\bin\Debug\";<br />
ads.ApplicationBase = @"C:\somecrazypath\bin\Debug\";<br />
ads.ConfigurationFile = @"C:\somecrazypath\bin\Debug\whatever.dll.config";<br />
AppDomain ad = AppDomain.CreateDomain("Whatever", null, ads);<br />
byte[] _assembly = loadFile(@"C:\somecrazypath\bin\Debug\whatever.dll");<br />
ad.Load(_assembly); //this line generates exception<br />