SharePoint issue with Eventhandler - sharepoint-2010

Question

PROBLEM: I have a list and if I create a new Item I would like to do the following:
Create a new AutoIncrement Number in Column [AutoGeneratedID]
Use [Titel] and [AutoGeneratedID] to create a HyperLink in the List and a new subsite
The problem is i cant get the [AutogeneratedID] filled with a value because it is an itemadded event but if i try to put the code together in an ItemAdding event, i get a problem as described in the following link:
http://www.sharepoint-tips.com/2006/09/synchronous-add-list-event-itemadding.html
using System;
using System.Security.Permissions;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Security;
using Microsoft.SharePoint.Utilities;
using Microsoft.SharePoint.Workflow;
using System.Diagnostics;
namespace KuC_Solution.EventReceiver1
{
/// <summary>
/// List Item Events
/// </summary>
public class EventReceiver1 : SPItemEventReceiver
{
/// <summary>
/// An item was added.
/// </summary>
public override void ItemAdded(SPItemEventProperties properties)
{
base.ItemAdded(properties);
// -----------------------------------------------------------
try
{
this.EventFiringEnabled = false;
// Column name AutoGeneratedID
string columnName = "AutoGeneratedID";
SPSecurity.RunWithElevatedPrivileges(delegate()
{
using (SPWeb web = properties.OpenWeb())
{
web.AllowUnsafeUpdates = true;
//get the current list
SPList list = web.Lists[properties.ListId];
int highestValue = 0;
foreach (SPListItem item in list.Items)
{
if (item[columnName] != null && item[columnName].ToString().Trim() != "")
{
string value = item[columnName].ToString();
try
{
int currValue = int.Parse(value);
if (currValue > highestValue)
highestValue = currValue;
}
catch (Exception ex)
{
Trace.WriteLine(ex.Message);
}
}
}
SPListItem currItem = list.Items.GetItemById(properties.ListItem.ID);
currItem[columnName] = (highestValue + 1).ToString();
currItem.SystemUpdate(false);
web.AllowUnsafeUpdates = false;
}
});
this.EventFiringEnabled = true;
}
catch (Exception ex)
{
Trace.WriteLine(ex.Message);
}
// -----------------------------------------------------------
}
/// <summary>
/// An item is being added.
/// </summary>
public override void ItemAdding(SPItemEventProperties properties)
{
base.ItemAdding(properties);
//-------------------------------------------------------------
// Get the web where the event was raised
SPWeb spCurrentSite = properties.OpenWeb();
//Get the name of the list where the event was raised
String curListName = properties.ListTitle;
//If the list is our list named SubSites the create a new subsite directly below the current site
if (curListName == "TESTautoNumber")
{
//Get the SPListItem object that raised the event
SPListItem curItem = properties.ListItem;
//Get the Title field from this item. This will be the name of our new subsite
String curItemSiteName2 = properties.AfterProperties["Title"].ToString();
//String curItemSiteName3 = properties.AfterProperties["ID"].ToString();
String mia = properties.AfterProperties["AutoGeneratedID"].ToString();
String curItemSiteName = curItemSiteName2 + mia;
//Get the Description field from this item. This will be the description for our new subsite
//String curItemDescription = properties.AfterProperties["Projekt-ID"].ToString();
string curItemDescription = "CREWPOINT";
//String testme = "1";
//Update the SiteUrl field of the item, this is the URL of our new subsite
properties.AfterProperties["tLINK"] = spCurrentSite.Url + "/" + curItemSiteName;
//Create the subsite based on the template from the Solution Gallery
SPWeb newSite = spCurrentSite.Webs.Add(curItemSiteName, curItemSiteName, curItemDescription, Convert.ToUInt16(1033), "{4ADAD620-701D-401E-8DBA-B4772818E270}#myTemplate2012", false, false);
//Set the new subsite to inherit it's top navigation from the parent site, Usefalse if you do not want this.
newSite.Navigation.UseShared = true;
newSite.Close();
}
//---------------------------------------------------------------
}
}
}