Problem with source from Books Online - Application.LoadPackage

I'm trying to execute a package in the file system from an c# assembly. In BOL there is the following sample code available:

ms-help://MS.VSCC.v80/MS.VSIPCC.v80/MS.SQLSVR.v9.en/dtsref9mref/html/M_Microsoft_SqlServer_Dts_Runtime_Application_LoadPackage_1_cfc592c3.htm

Application.LoadPackage Method (String, IDTSEvents)

class ApplicationTests
{
static void Main(string[] args)
{
// The variable pkg points to the location of the
// ExecuteProcess package sample installed with
// the SSIS samples.
string pkg = @."C:\Program Files\Microsoft SQL Server\90\Samples\Integration Services\Package Samples\ExecuteProcess Sample\ExecuteProcess\UsingExecuteProcess.dtsx";

Application app = new Application();
Package p = app.LoadPackage(pkg, null);
// Now that the package is loaded, we can query on
// its properties.
int n = p.Configurations.Count;
DtsProperty p2 = p.Properties["VersionGUID"];
DTSProtectionLevel pl = p.ProtectionLevel;

Console.WriteLine("Number of configurations = " + n);
Console.WriteLine("VersionGUID = " + p2);
Console.WriteLine("ProtectionLevel = " + pl);
}
}

I added the reference to "Microsoft.SQLServer.DTSRuntimeWrap" and declared it by

using Microsoft.SqlServer.Dts.Runtime.Wrapper;

No I'm not able to compile because app.LoadPackage(pkg, null); needs an additional IDTSEvents90. After changing the row to

Package p = app.LoadPackage(pkg, true, null);

I'm getting the following errors:

Error 1 Cannot implicitly convert type 'Microsoft.SqlServer.Dts.Runtime.Wrapper.IDTSPackage90' to 'Microsoft.SqlServer.Dts.Runtime.Wrapper.Package'. An explicit conversion exists (are you missing a cast?)

Error 2 The type or namespace name 'DtsProperty' could not be found (are you missing a using directive or an assembly reference?)

Error 3 'Microsoft.SqlServer.Dts.Runtime.Wrapper.Package' does not contain a definition for 'Properties'

Can someone please give me an example how to start the Package now in the latest code syntax and set the values of a variable from outside?

I am using the following versions

Microsoft Visual Studio 2005
Version 8.0.50727.26 (RTM.050727-2600)
Microsoft .NET Framework
Version 2.0.50727

SQL Server Integration Services
Microsoft SQL Server Integration Services Designer
Version 9.00.1314.00

Best regards,
Dirk

Add a reference to Microsoft.SqlServer.ManagedDts.dll and use namespace Microsoft.SqlServer.Dts.Runtime (without .Wrapper).

.Wrapper assembly and namespace contain COM interop declarations - i.e. if you want to work with unmanaged object model directly. It is usually more convinient to work with managed object model built on top of it.sql