Activator Class

Imports System.Reflection
Imports System.Text

Public Class Example

   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      Dim sbType As Type = GetType(StringBuilder)

      ' Create an instance of the StringBuilder type using Activator.CreateInstance
      ' and the parameterless constructor.
      Dim o As Object = Activator.CreateInstance(sbType)

      ' Append a string to the StringBuilder object and display the StringBuilder,
      ' late bound.
      sbType.InvokeMember("Append", _
         BindingFlags.Public Or BindingFlags.Instance Or BindingFlags.InvokeMethod, _
         Type.DefaultBinder, _
         o, New Object() { "Hello, there." })
      outputBlock.Text &= o.ToString() & vbCrLf

      ' Create an instance of StringBuilder using the constructor that takes a 
      ' string.
      o = Activator.CreateInstance(sbType, New Object() { "Hello, there." })

      ' Append a string to the StringBuilder object and display the StringBuilder,
      ' late bound.
      sbType.InvokeMember("Append", _
         BindingFlags.Public Or BindingFlags.Instance Or BindingFlags.InvokeMethod, _
         Type.DefaultBinder, _
         o, New Object() { " And hello again!" })
      outputBlock.Text &= o.ToString() & vbCrLf
   End Sub

End Class

' This code produces the following output:
' 
'Hello, there.
'Hello, there. And hello again!

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

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      Type sbType = typeof(StringBuilder);

      // Create an instance of the StringBuilder type using Activator.CreateInstance
      // and the parameterless constructor.
      object o = Activator.CreateInstance(sbType);

      // Append a string to the StringBuilder object and display the StringBuilder,
      // late bound.
      sbType.InvokeMember("Append", 
         BindingFlags.Public | BindingFlags.Instance | BindingFlags.InvokeMethod, 
         Type.DefaultBinder, 
         o, new object[] {"Hello, there."});
      outputBlock.Text += o.ToString() + "\n";

      // Create an instance of StringBuilder using the constructor that takes a 
      // string.
      o = Activator.CreateInstance(sbType, new object[]{"Hello, there."});

      // Append a string to the StringBuilder object and display the StringBuilder,
      // late bound.
      sbType.InvokeMember("Append", 
         BindingFlags.Public | BindingFlags.Instance | BindingFlags.InvokeMethod, 
         Type.DefaultBinder, 
         o, new object[] {" And hello again!"});
      outputBlock.Text += o.ToString() + "\n";
   }
}

/* This code produces the following output:

Hello, there.
Hello, there. And hello again!
 */