"Directory is not empty" error message when deleting directory

I have a simple function for creating a directory, check first to see if the directory already exists.  If it does, delete it.

I keep getting the error message "the directory is not empty", but I specify that the recursive parameter is TRUE, which should delete these subdirectories/files...

Am I missing something?

 

protected void CreateDirectory(string target_directory)
    {
        try
        {
            if (Directory.Exists(target_directory))
            {
                try
                {
                    lblOutput.Text += "<br />deleting directory: " + target_directory;
                    Directory.Delete(target_directory, true);
                }
                catch (Exception Ex)
                {
                    Session["error_message"] += "<br />Error deleting " + target_directory + ": " + Ex.Message;
                    throw (Ex);
                }
            }

            try
            {
                Directory.CreateDirectory(target_directory);
            }
            catch (Exception Ex)
            {
                Session["error_message"] += "<br />Error creating directory (" + target_directory + "): " + Ex.Message;
            }
        }
        catch (Exception Ex)
        {
            Session["error_message"] += "<br />Error during CreateDirectory(" + target_directory + "): " + Ex.Message;
            throw (Ex);
        }
    }

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