Server side code is executed at the server and written in VB Code whereas client side code is executed at the client side. Mostly client side coding is done in Javascrit.
The reason why we do client side validations is to save the to and fro time taken for the request to go to the server and the response to get back to the browser.
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How to create a DB connection at one place/page so that we can use that connection for all pages/forms/windows.what r the steps ned to be performed. if question not clear,let me know.