How to create folders in document library dynamically in sharepoint 2010

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SharePoint2010

Hi,

I want to create dynamic folders and subfolders in a document library when any new folder created in the same library.
Also I want to repeat the same for number of document libraries which may present in another subsites.

I have a made a sample code to create folder whenever any user add any new folder. It is creating the folders but at the time of debugging it is throwing array out of bounds error. Though it is creating folders as per desired.

public class DynamicFolderCreationEventReciever : SPItemEventReceiver
    {
        private string[] folders = new string[] { "One", "Two", "Three" };
       /// <summary>
       /// An item was added.
       /// </summary>
       public override void ItemAdded(SPItemEventProperties properties)
       {
           try
           {
               using (SPSite objSPSiteCollection = new SPSite(SPContext.Current.Web.Url))
               {
                   using (SPWeb objSPWeb = objSPSiteCollection.RootWeb)
                   {

                      // base.ItemAdded(properties);
                       SPListItem item = properties.ListItem;
                       //SPDocumentLibrary objDocLib = (SPDocumentLibrary)objSPWeb.Lists[properties.ListId];   
                       SPDocumentLibrary obj=objSPWeb.Lists["CustomDocLibrary"] as SPDocumentLibrary;
                       if (item.FileSystemObjectType== SPFileSystemObjectType.Folder )
                       {
                           String url = properties.ListItem.ParentList.RootFolder.ServerRelativeUrl.ToString();
                           SPFolder libFolder = obj.RootFolder.SubFolders[properties.ListItem.Name];

                           string newFolderUrl = (objSPWeb.Url + "/" + libFolder.ToString());

                           for (int i = 0; i < folders.Length; i++)
                           {
                               SPListItem newFolder = obj.Items.Add(newFolderUrl, SPFileSystemObjectType.Folder, folders[i].ToString());
                               newFolder.Update();
                           }
                       }
                       else
                       {

                       }


                   }
               }
           }
           catch (SPException ex)
           {
               throw ex;
           }
       }

    }

I don't know why that error coming while debugging. And how can I create subfolders.



Thanks