pass data from asp to javascript

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ASP.NET

Javascript

Hello,

I have defined a dataview in my asp programm (customer_info.aspx.cs), and by clicking the asp button I connected to database and get some records and I can show the fields of the first record in my asp textBoxes.

I want to have an html button which, when I click it, shows the second record which is still stored in my dataview.
To do this I'm forced to use clientside event, because if I use asp button to do this when I click it My data view becomes empty.
I want to pass may dataview to the javascript function and get the fields of the other records from the dataview and put them in my asp textBoxes and if I click it again it shows me the fields of the third record.

I don't know how to write this javascript function and how to pass my dataview to this function.