Assembly asm = Assembly.GetAssembly(typeof(System.Windows.Forms.TextBox));
Type t = asm.GetType("System.Windows.Forms.CheckBox");
MessageBox.Show(t.FullName);
Type t = System.Reflection.Assembly.LoadFrom(@"C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\System.Windows.Forms.dll").GetType("System.Windows.Forms.CheckBox");