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I'm having some trouble getting my head around casting an interface I've come up with. It's an MVP design for C# Windows Forms. I have an IView class which I implement on my form classes. There's also an IPresenter which I derive into various specific Presenters. Each Presenter will manage the IView differently depending on the role, for example opening the dialog to enter a new set of data with an AddPresenter as opposed to editing existing data with an EditPresenter which would preload data onto the form. Each of these inherit from IPresenter. I want to use the code as such: AddPresenter<ConcreteView> pres = new AddPresenter<ConcreteView>(); I basically have this working but these presenters and the views they manage are bundled into plugins which are loaded post runtime which means I need a Manager class which acts as the plugin interface take a "mode" parameter. This mode parameter is use for a factory method to create either the Add or Edit Presenter, but because the call to show the dialog is made later on then I need to make the call via the IPresenter interface like so: private IPresenter<IView> pres; public ShowTheForm() { pres.ShowDialog(); } Now I'm having issues when it comes to casing my concrete instantiation of an AddPresenter say, to the 'pres' member. Here's a cut down simplified version of what I have: interface IView { void ViewBlah(); } interface IPresenter<V> where V : IView { void PresBlah(); } class CView : IView { public void ViewBlah() { } } class CPresenter<T> : IPresenter<T> where T : IView { public void PresBlah() { } } private void button3_Click(object sender, EventArgs e) { CPresenter<CView> cpres = new CPresenter<CView>(); IPresenter<IView> ipres = (IPresenter<IView>)cpres; } This is the error: Un

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