class SampleClass
    {
        public void Call1(String str)
        {
            MessageBox.Show("Call1 : " + str);
        }//

        public void Call2(String str)
        {
            MessageBox.Show("Call2 : " + str);
        }//

    }////

ต้องการ create object ของ คลาส SampleClass เรียกใช้ Method Call1 ได้ดังนี้ครับ

            Assembly assembly = Assembly.GetExecutingAssembly();
            AssemblyName assemblyName = assembly.GetName();
            Type objType = assembly.GetType(assemblyName.Name + ".SampleClass");
            object obj = Activator.CreateInstance(objType);
            object[] mParam = new object[] { "Chiwa Kantawong" };
            objType.InvokeMember("Call1",
                                                         BindingFlags.InvokeMethod,
                                                         null, obj, mParam);

 และสามารถ casting มาใส่ Object ได้นะครับ เช่น

SampleClass smp = (SampleClass)obj; 
smp.Call1("Pee Pee");

อีกอันประยุกต์ใช้กับ ChildForm ที่เป็น single instance ครับ

private void CreateChildForm(String formName)
        {
            Form[] AllChild = this.MdiChildren;
            Boolean found = false;
            Form foundForm = null;

            foreach (Form childForm in AllChild)
            {
                if (childForm.Name == formName)
                {
                    foundForm = childForm;
                    found = true;
                }
            }
            if (found)
            {
                try
                {
                    foundForm.Focus();
                }
                catch (Exception) { }
            }
            else
            {
                Assembly assembly = Assembly.GetExecutingAssembly();
                AssemblyName assemblyName = assembly.GetName();
                Type objType = assembly.GetType(assemblyName.Name + "." + formName);
                Form  form = (Form) Activator.CreateInstance(objType);
                form.MdiParent = this;
                form.Show();
                form.BringToFront();
            }
        }//