$(document).ready(function () 
{
    $("#form1").validate({ rules: 
                            { 
                            txtName: { required: true },
                            txtEmail: { required: true, email: true },
                            txtSubject: { required: true }
                            }, 
                messages: {txtEmail: "A valid email is required.",
                           textName: "Name is required."
                           }
            });
     });