.NET late binding

I am pretty sure I lifted this from a news group posting but I am not sure where.

using System;
using System.Reflection;
using System.Runtime;
using System.Runtime.InteropServices;
namespace Adastra.General
{
  ///
  /// Easy access to late-binding wrapper
  ///
  public class ComCreateObject
  {
    private Type comType;
    private object comObject;
    ///
    /// Generate new class
    ///
    /// com object prog id
    public ComCreateObject(string ProgID)
    {
      comType = Type.GetTypeFromProgID(ProgID);
      if (comType == null)
        throw new ArgumentException(
          "Com ProgId not found",
          "ProgId");
      comObject = Activator.CreateInstance(comType);
    }
    ///
    /// Execute late-bound method
    ///
    /// method name
    /// parameters
    ///
    public object Execute(string method, 
      params object[] parameters)
    {
      return comType.InvokeMember(method, 
        BindingFlags.InvokeMethod, 
        null, 
        comObject, 
        parameters);
    }
    public void ExecuteSet(string method,
      object parameter)
    {
      ExecuteSet(method, new object[] { parameter });
    }
    ///
    /// Execute late-bound property property-set
    ///
    /// property name
    /// value
    public void ExecuteSet(string propertyName,
      params object[] parameters)
    {
      comType.InvokeMember(propertyName, 
        BindingFlags.SetProperty, 
        null, 
        comObject, 
        parameters);
    }
    ///
    /// Execute late-bound property property-get
    ///
    /// property name
    /// parameters
    ///
    public object ExecuteGet(string propertyName,
      params object[] parameters)
    {
      return comType.InvokeMember(propertyName, 
        BindingFlags.GetProperty, 
        null, 
        comObject, 
        parameters);
    }
    ///
    /// Execute late-bound property property-get
    ///
    /// property name
    ///
    public object ExecuteGet(string propertyName)
    {
      return comType.InvokeMember(propertyName, 
        BindingFlags.GetProperty, 
        null, 
        comObject, 
        null);
    }
    public void Dispose()
    {
      Marshal.ReleaseComObject(comObject);
      comObject = null;
    }
  }
}

// Get type of the COM object xxxx
Type objectType = Type.GetTypeFromProgID("xxxx");

// Create instance of the COM object
object comObject = Activator.CreateInstance( objectType);

// Get the Count property
int count = (int) objectType.InvokeMember(
    "Count",
    BindingFlags.GetProperty,
    null,
    comObject,
    null);