Jquery server side validation in mvc

Question

I am validating a name form serverside but it is shows me error message without validating and without calling conroller action method.

 <script>
                try {
                    var apiUrl = '@Url.Action("Validate", "ServerValidations")';

                    $('#formAdd').validate({
                        errorElement: 'span', //default input error message container
                        errorClass: 'help-block help-block-error', // default input error message class
                        focusInvalid: false, // do not focus the last invalid input
                        ignore: "",  // validate all fields including form hidden input
                        messages: {
                            Name: {
                                required: 'Please enter Name',
                                maxlength: 'Length exceeded! Size should be less than 50 characters',
                                VerifyName: "This Job title already exist in "
                            }
                        },
                        rules: {
                            ArName: {
                                maxlength: 50,
                                required: true,
                                VerifyrName: true
                            }

                        }


                    });

                } catch (err) {
                    //  alert(err.message);
                }


function addVerifyNameRule(apiUrl, errMessage) {
    //alert('add rule :'+apiUrl);
    jQuery.validator.addMethod("VerifyName", function (value, element) {
        //alert('call validator');
        $.ajax({
            type: 'POST',
            dataType: 'json',
            async: false,
            url: apiUrl,
            data: { 'Value': value, 'ValidateRule': 1 },
            success: function (result) {
                alert('res');
                if (result['ValidateResult'] == '1') {
                    return true;
                    //alert('valid!');
                }else
                {
                    return false;
                    //alert('not valid!');
                }
            },
            error: function (err) {
                return false;
                //alert('error : ' + err.message);
            }
        });
      //  return result;
    }, errMessage);