Error while deleting folders

Hi,

I am currently using the filevistacontrol to control files in an online system. The filevista control communicates with a database. When i add/rename/move etc. a method is executed which updates the database. 

When i want to delete a folder which has one or multiple subfolders i get an error message "Object reference not set to an instance of an object".. The control doesnt function anymore, but when i reload the page i see that the folders are deleted from the filesystem aswell as the database. 

I was wondering if someone could tell me what goes wrong here.

Code snippets:

Code to delete the entry in the database:
    protected void FileVistaControl_Deleted(object sender, FileVistaDeletedEventArgs e)
    {
        foreach (var name in e.ItemNames)
        {
            ContentDirectoryBO directory = _directoryLogic.GetContentDirectory(e.RelativePath, name, e.RootFolder.Name);
            if (directory != null)
            {
                this.DeleteDirectory(directory, true);
            }
        }
    }

i think there goes something wrong with reloading the control after de deletion of the folders but i cant figure out what goes wrong.

Any help would be appreciated.

Regards,
Gerard

Hi Gerard,
Please see this topic for the reason of this problem:
Delete Folder with Session Timeout

Thank you for the quick response. Much appreciated!
I will work out a solution based on the information in reply.

Gerard