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public static void changefoliename(string filekey, string newname)
        {
            string sqlcomstring = "UPDATE tblfolie SET folienname=" + newname
                + " WHERE foliennr ="+filekey;
            SqlConnection sqlcon = getsqlconnection();
            SqlCommand sqlcom = new SqlCommand(sqlcomstring, sqlcon);
            
            try
            {
                sqlcon.Open();
                sqlcom.ExecuteNonQuery();
                sqlcon.Close();
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
        }