[jQuery] Validate

[psyberX]

I am using jquery ajax to call asp.net page method. How can I use
jquery validation for such case when there is no form submission.

Here's the code portion used to call page method.

$.ajax({
                type: "POST",
                url: pagePath + "/" + fn,
                contentType: "application/json; charset=utf-8",
                data: paramList,
                dataType: "json",
                success: successFn,
                error: errorFn
            })