You can easily do using ValidationEngine jQuery Plugin
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
body
{
margin: 100px;
font-family: Arial;
font-size: 10pt;
}
input, select
{
width: 150px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<link href="ValidationEngine.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" src="http://cdn.ucb.org.br/Scripts/formValidator/js/languages/jquery.validationEngine-en.js"
charset="utf-8"></script>
<script type="text/javascript" src="http://cdn.ucb.org.br/Scripts/formValidator/js/jquery.validationEngine.js"
charset="utf-8"></script>
<script type="text/javascript">
$(function () {
$("#form1").validationEngine('attach', { promptPosition: "topRight" });
});
</script>
<table border="0" cellpadding="0" cellspacing="0">
<tr>
<td>
</td>
<td>
Please fill the following Form
</td>
</tr>
<tr>
<td style="height: 40px">
</td>
</tr>
<tr>
<td>
Name:
</td>
<td>
<asp:TextBox ID="txtName" runat="server" CssClass="validate[required]" />
</td>
</tr>
<tr>
<td style="height: 40px">
</td>
</tr>
<tr>
<td>
Email:
</td>
<td>
<asp:TextBox ID="txtEmail" runat="server" CssClass="validate[required,custom[email]]" />
</td>
</tr>
<tr>
<td style="height: 40px">
</td>
</tr>
<tr>
<td>
City:
</td>
<td>
<asp:DropDownList ID="ddlCities" runat="server" CssClass="validate[required]">
<asp:ListItem Text="Please Select" Value="" />
<asp:ListItem Text="Mumbai" Value="1" />
<asp:ListItem Text="Delhi" Value="2" />
<asp:ListItem Text="Kolkatta" Value="2" />
<asp:ListItem Text="Chennai" Value="3" />
</asp:DropDownList>
</td>
</tr>
<tr>
<td style="height: 40px">
</td>
</tr>
<tr>
<td>
Password:
</td>
<td>
<asp:TextBox ID="txtPassword" runat="server" TextMode = "Password" CssClass="validate[required]" />
</td>
</tr>
<tr>
<td style="height: 40px">
</td>
</tr>
<tr>
<td>
Confirm Password:
</td>
<td>
<asp:TextBox ID="txtConfirmPassword" TextMode = "Password" runat="server" CssClass="validate[required,equals[txtPassword]]" />
</td>
</tr>
<tr>
<td style="height: 40px">
</td>
</tr>
<tr>
<td>
</td>
<td>
<asp:Button Text="Submit" runat="server" />
</td>
</tr>
</table>
<div>
</div>
</form>
</body>
</html>
