C#

string strConnect = File.ReadAllText(pathToTextFile);

static void Main(string[] args)
{
  // For the sake of this example, we're just printing the arguments to the console.
  for (int i = 0; i < args.Length; i++) {
    Console.WriteLine("args[{0}] == {1}", i, args[i]);
  }
}

public void CastingCouch() {
  List<ISomeInterface> someInstances = new List<ISomeInterface>();
  someInstances.Add(new SomeClass<int>(100, 200));
  someInstances.Add(new SomeClass<string>(200, "whoop de doo"));
  someInstances.Add(new SomeClass<DateTime>(300, DateTime.Now));

  foreach (ISomeInterface reference in someInstances) {
    Console.Write("{0}  ", reference.GetType());

    if (reference is SomeClass<string>) {
      Console.WriteLine("String");
    } else if (reference is SomeClass<int>) {
      Console.WriteLine("Int");
    } else {
      Console.WriteLine("Don't know");
    }
  }
}

class SomeOtherClass : ISomeInterface { ... }
class YetAnotherClass<TKey, TValue> : ISomeInterface { ... }

someInstances.Add(new SomeOtherClass(42));
someInstances.Add(new YetAnotherClass<NotTheTypeYoureLookingFor, TheDroids>());

Type referenceType = reference.GetType();
if (referenceType.IsGenericType && referenceType.GetGenericTypeDefinition == typeof(SomeClass<>))
{
    // It's a SomeClass<T>:
    Type t = referenceType.GetGenericArguments()[0];
    ...
}
else
{
    // It's something else
}