Page_ClientValidate is not defined

asp.net, client-side

Solution

..so.. i think may be there is not any RequiredValidator Control in your page~~

Problem

I am using ASP.NET 2.0 and I'm using IE8 as my default browser but no matter how many times I try, Page_ClientValidate keeps giving me this error that it is not defined. How can I solve this problem? Please help.

Original source