[jQuery] How can I use "remote" option in asp.net

[Sun]

Hi, everybody

I have some questions for the "remote" option in asp.net page, If I
have some value need to be verified in order to make it is unique, for
example:

.....
.....

userName:{
  required: true,
  remote: "verify.aspx"
}

about the verify.aspx, I don't know how to output the result. I
appreciate you feedback.

thanks,