exe already installed in my client place.i don't want to give the password of database to my client but i want to update value of one of field in a table from our place without using internet access and remoting concept is there any possibility . please suggest me reply urgently

I'm not aware of way to do it from your site, not based on your constraints. Perhaps send your client the script and let them execute it on their end, encrypting the password within the script? You can easily do this within a bat file, invoking osql (provided it exists on your client's machine).