Since ASP.Net changes the field name when rendering the controls, you have to use
<%= control.UniqueID %>
as the name of fields. For more information, please refer to the
official documentation.
<%@ Page
Title=""
Language="C#"
MasterPageFile="~/Master.Master"
AutoEventWireup="true"
CodeBehind="..."
Inherits="..." %>
<asp:ContentID="Content1"ContentPlaceHolderID="ContentPlaceHolder1"runat="server"><!-- Fields --><asp:TextBoxrunat="server"CssClass="form-control"ID="userNameTextBox"/><scripttype="text/javascript">$(document).ready(function(){$('#form1').formValidation({
framework:'bootstrap',
icon:{
valid:'glyphicon glyphicon-ok',
invalid:'glyphicon glyphicon-remove',
validating:'glyphicon glyphicon-refresh'},
fields:{// There is no single quote<%=userNameTextBox.UniqueID%>:{
validators:{
notEmpty:{
message:'The username is required and cannot be empty'},
stringLength:{
min:6,
max:30,
message:'The username must be more than 6 and less than 30 characters long'},
regexp:{
regexp:/^[a-zA-Z0-9]+$/,
message:'The username can only consist of alphabetical and number'},
different:{
field:'password',
message:'The username and password cannot be the same as each other'}}}}});});</script></asp:Content>