----------
CreateInstance 方法會從目前執行中的組件建立型別的執行個體。 
CreateInstanceFrom 方法會從包含組件的檔案建立執行個體。 
CreateComInstanceFrom 方法會從包含組件的檔案建立 COM 物件的執行個體。

// Create an instance of the StringBuilder type using 
// Activator.CreateInstance.
Object o = Activator.CreateInstance(typeof(StringBuilder));

// Append a string into the StringBuilder object and display the 
// StringBuilder.
StringBuilder sb = (StringBuilder) o;
sb.Append("Hello, there.");
Console.WriteLine(sb);


----------

        static public Form ZShowAndActive(Type typeForm)
        {
            Form FormToCall = null;
            FormToCall = Application.OpenForms[typeForm.Name];
            if (FormToCall == null)
                FormToCall = (Form)Activator.CreateInstance(typeForm);
            
            FormToCall.Show();
            FormToCall.Activate();
            return FormToCall;
        }

        private void jsonTestToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ZForm.ZShowAndActive(typeof(FJson));
        }

----------
using System;
using System.Reflection;
using System.Text;

public class SomeType
{
    public void DoSomething(int x)
    {
        Console.WriteLine("100 / {0} = {1}", x, 100 / x);
    }
}

public class Example
{
    static void Main()
    {
        // Create an instance of the StringBuilder type using 
        // Activator.CreateInstance.
        Object o = Activator.CreateInstance(typeof(StringBuilder));

        // Append a string into the StringBuilder object and display the 
        // StringBuilder.
        StringBuilder sb = (StringBuilder) o;
        sb.Append("Hello, there.");
        Console.WriteLine(sb);

        // Create an instance of the SomeType class that is defined in this 
        // assembly.
        System.Runtime.Remoting.ObjectHandle oh = 
            Activator.CreateInstanceFrom(Assembly.GetEntryAssembly().CodeBase, 
                                         typeof(SomeType).FullName);

        // Call an instance method defined by the SomeType type using this object.
        SomeType st = (SomeType) oh.Unwrap();

        st.DoSomething(5);
    }
}

/* This code produces the following output:

Hello, there.
100 / 5 = 20
 */

----------

ObjectHandle            hdlSample;
IMyExtenderInterface    myExtenderInterface;
string                  argOne = "Value of argOne";
int                     argTwo = 7;
object[]                args = {argOne, argTwo};
// Uses the UrlAttribute to create a remote object.
object[]                activationAttributes = {new UrlAttribute("http://localhost:9000/MySampleService")};
// Activates an object for this client.
// You must supply a valid fully qualified assembly name here. 
hdlSample = Activator.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken",
                                     "samplenamespace.sampleclass", 
                                     true,
                                     BindingFlags.Instance|BindingFlags.Public,
                                     null,
                                     args,
                                     null,
                                     activationAttributes,
                                     null);
myExtenderInterface = (IMyExtenderInterface)hdlSample.Unwrap();
Console.WriteLine(myExtenderInterface.SampleMethod("Bill"));