C#

namespace bla 
{
    public class X
    {
        public void Test(string what)
        {
            Console.WriteLine(what);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Assembly asm = Assembly.GetExecutingAssembly();
            if (asm != null)
            {
                object obj = asm.CreateInstance("bla.X");
                //Type[] types = asm.GetExportedTypes(); // why load all types if you need only one?
                Type xType = obj.GetType();

                // I now need to invoke a method from the class for further processing.
                MethodInfo mi = xType.GetMethod("Test"); // get the method from the type
                mi.Invoke(obj, new object[] { "Hello World" }); // invoke it on the object
            } 
            Console.ReadKey(); 
        } 
    }
}  

Bastard Programmer from Hell
if you can't read my code, try converting it here[^]

Dan_K wrote:

The problem now is to make function calls from the class

public static IGameType LoadContent(String filename){
 Assembly a = Assembly.LoadFrom(filename);
 if(a == null) throw new GameLoadException("Assembly "+filename+" not found or not valid");
 foreach(Module mod in a.GetLoadedModules()){
  foreach(Type ty in mod.GetTypes()){
   foreach(Type intf in ty.GetInterfaces()){
    if(intf == typeof(IGameType)){
     return (IGameType)System.Activator.CreateInstance(ty);
    }
   }
  }
 }
}