Jquery to add data to database and retrieve record from db for asp.net

Jquery to add data to database and retrieve record from db for asp.net

Hi, I am new to jquery and i have no freaking idea about jquery. One of the requirement is to use Jquery to data store and data retrieval so on my aspx page, a user enters a comment and clicks on "Add" button.When user clicks on Add button, I wan to add comments to database. Once data is added to db, I also want to retrieve same data, user name and current datetime as a dataset and show it on the page.
 
How can I achieve this? I am creating a webservice which accepts "comments" as parameter and stores into database.
 
Thanks in advance for your help.