Cannot add new item to list in ItemAdded Event Receiver - sharepoint

Question

Can anybody tell me why this code doesn't work?
The "adding code" itself works, but unfortunately not in an ItemAdded Event.
I need this code in the ItemAdded Event and therefor i cannot use ItemAdding.
Thanks for any help.
public override void ItemAdded(SPItemEventProperties properties)
{
SPSite site = new SPSite("http://air_sim:39167/");
SPWeb web1 = site.RootWeb;
SPList List = web1.Lists["Announcements"];
SPListItem newitem = List.Items.Add();
newitem["Title"] = "Example";
newitem.Update();
}

Answer 1

Did you do any steps to attach event receiver to your list?
If no, you can install a feature to manage event receivers and
verify that the event receiver is added and if not, add it manually:
http://chrissyblanco.blogspot.com/2007/08/event-receiver-management.html
Maybe exception is thrown somwere? For example, if such site or list
with such name doesn't exist, exception will be thrown. Also if you
don't initialise required fields of your item, the Update() call
will throw exception.
By the way the properties variable contains many useful properties:
SPListItem newitem = properties.List.Items.Add();
newitem["Title"] = "Example";
newitem.Update();

Answer 2

Do you use Sharepoint 2010 or Sharepoint2007?
Do you use VS2008 or VS2010?
If you couldn’t use debugger, use EventLog:
public override void ItemAdded(SPItemEventProperties properties)
{
EventLog.WriteEntry("DebugSharepoint", "ItemAdded fired");
try
{
SPSite site = new SPSite("http://air_sim:39167/");
SPWeb web1 = site.RootWeb;
SPList List = web1.Lists["Announcements"];
SPListItem newitem = List.Items.Add();
newitem["Title"] = "Example";
newitem.Update();
}
catch(Exception e)
{
EventLog.WriteEntry("DebugSharepoint", e.Message, EventLogEntryType.Error);
}
}

Answer 3

Attach a debugger.
Go to cmd and type iisapp. You would get the worker process id.
Then open your event handler project and go to the tools and attach process and set the debug point on ItemAdded as well as ItemAddding event

Answer 4

Try the below solutions:
Check whether the Site exists with that name.
Check whether user has the permission to insert item.
Try using AllowUnsafeUpdates:
SPSite site = new SPSite("site address");
SPWeb web1 = site.RootWeb;
SPList List = web1.Lists["Announcements"];
web1.AllowUnsafeUpdates = true;
SPListItem newitem = List.Items.Add();
newitem["Title"] = "Example";
newitem.Update();
web1.AllowUnsafeUpdates = false;