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    <pre> &lt;%@ Page Language="C#" AutoEventWireup="true" CodeFile="dentistJquery.aspx.cs" Inherits="dentistJquery" %> &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> &lt;html xmlns="http://www.w3.org/1999/xhtml"> &lt;head> &lt;meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> &lt;title>Jquery Validation with Regular Expressions.&lt;/title> &lt;script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.0/jquery.min.js" type="text/javascript">&lt;/script> &lt;script src="Scripts/jquery.validate.js" type="text/javascript">&lt;/script> &lt;script type="text/javascript"> $(document).ready(function() { $.validator.addMethod("email", function(value, element) { return this.optional(element) || /^[a-zA-Z0-9._-]+@[a-zA-Z0-9-]+\.[a-zA-Z.]{2,5}$/i.test(value); }, "Please enter a valid email address."); // if(document.getElementById("email").value !=null) // { // document.getElementById("contactnumber").style.display='block'; // } $.validator.addMethod("firstname",function(value,element){ return this.optional(element) || /^[a-zA-Z0-9._-]{5,16}$/i.test(value); },"First name is required and must be valid."); $.validator.addMethod("lastname", function(value,element) { return this.optional(element) || /^[a-zA-Z0-9._-]{5,16}$/i.test(value); }, "Last Name is required and must be valid."); $.validator.addMethod("contactnumber",function(value,element){ return this.optional(element) || /^[0-9\-\+]+$/i.test(value); },"Contact Number is required and must be valid."); $.validator.addMethod("comment" ,function(value,element){ return this.optional(element) || /^[a-zA-Z0-9._-]{10,16}$/i.test(value); }, "please Enter the comment at least 50 character"); // Validate signup form $("#signup").validate({ rules: { email: "required email", firstname: "required firstname", contactnumber: "required contactnumber", lastname: "required lastname", comment: "required comment", }, }); }); &lt;/script> &lt;style> *{ margin:0px; padding:0px; } body { font-family:Arial, Helvetica, sans-serif; font-size:13px; } input { width:220px; height:25px; font-size:13px; margin-bottom:10px; border:solid 1px #333333; } label.error { font-size:11px; background-color:#cc0000; color:#FFFFFF; padding:3px; margin-left:5px; -moz-border-radius: 4px; -webkit-border-radius: 4px; } &lt;/style> &lt;/head> &lt;body> &lt;div align="center"> &lt;div style="width:650px; margin-top:20px" align="left"> &lt;div style="margin-left:10px"> &lt;form method="post" action="About.aspx" name="signup" id="signup"> &lt;b>First Name&lt;/b>&lt;br /> &lt;input type="text" name="firstname" value="Please Enter First Name" id="firstname" />&lt;br /> &lt;b>Last Name&lt;/b>&lt;br /> &lt;input type="text" name="lastname" value=" Please Enter Last Name" id="lastname" />&lt;br /> &lt;b>Email&lt;/b>&lt;br /> &lt;input type="text" name="email" value="Please Enter your Email " id="email" />&lt;br /> &lt;b>phone Number&lt;/b>&lt;br /> &lt;input type="text" name="contactnumber" value=" Please Enter Your Contact Number" id="contactnumber" />&lt;br /> &lt;b>Message&lt;/b>&lt;br /> &lt;textarea name="comment" id="comment" >&lt;/textarea> &lt;br />&lt;br /> &lt;input type="submit" value=" Submit " name='SUBMIT' id="SUBMIT"/> &lt;/form> &lt;/div> &lt;/div> &lt;/div> &lt;/body> &lt;/html> </pre>
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