сборка dll:
.............
namespace testform
{
public partial class FormDll : Form
{
public FormDll()
{
InitializeComponent();
}
}
}
.............
приложение
Assembly assembly = Assembly.LoadFile("C:\\prg\\testform.dll");
Type type = assembly.GetType("testform.FormDll ");
Form form = (Form)Activator.CreateInstance(type);
form.ShowDialog();