Impersonate for creating Tasks on a server

See more:

C#

.NET

TaskScheduler

Hey there,

I want to create Tasks on a server using an application on computers.

To be abled to work with tasks iam using the Task Scheduler Class Library from this article:

A New Task Scheduler Class Library for .NET[^]

To impersonate i use this:
User Impersonation in .NET[^]

To test it I wrote this simple code to run it on my computer:

ImpersonateUser iU = new ImpersonateUser();
iU.Impersonate("servername", "accountname", "password");
//the account has admin privileges
try
{
    ScheduledTasks st = new ScheduledTasks("servername");
    foreach (string a in st.GetTaskNames())
    {
        MessageBox.Show(a);
    }
}
catch (Exception e)
{
    MessageBox.Show(e.ToString());
}
iU.Undo();

After the line

ScheduledTasks st = new ScheduledTasks("servername");

I get an Access Denied Exception.

Does anyone know why?

Thanks in advance.