Use JavaScript validation like validation summary
Step 1. Create a form as below..
<html>
<head>
<title></title>
<link
href="/css/hcs/site.css"
temp_href="/css/hcs/site.css"
rel="stylesheet"
type="text/css"
/>
</head>
<div class="request_form">
<form
action="http://abc.com/get.html"
class="request_form"
enctype="application/x-www-form-urlencoded"
id="Form"
method="post"
name="Form">
<table>
<tr>
<th>
<label>
* First Name:</label>
</th>
<th>
<label>
* Last Name:</label>
</th>
</tr>
<tr>
<td>
<input class='input_txt1' id="FirstName" maxlength='255' name="FirstName" tabindex='1' type='text' value="" />
<br>
</td>
<td>
<input class='input_txt1' id="LastName" maxlength='255' name="LastName" tabindex='2' type='text' value="" />
<br>
</td>
</tr>
<tr>
<th>
<label>
* Company Name:</label>
</th>
<th>
<label>
* Email Address:</label>
</th>
</tr>
<tr>
<td>
<input class='input_txt1' id="Company" maxlength='255' name="Company" tabindex='3' type='text' value="" />
<br>
</td>
<td>
<input class='input_txt1' id="Email" maxlength='255' name="Email" tabindex='4' type='text' value="" />
<br>
</td>
</tr>
<tr>
<td colspan="2" align="right">
<input id='FrmSubmit' name='submitButton' class="input_submit" type='submit' value='Submit' onclick='return validate();'>
</td>
</tr>
</table>
</form>
</div>
</html>
Step 2. Add given script and call this on button onclick event by onclick='return validate();'.
<script type="text/javascript">
function validate() {
var
FirstName = document.getElementById('FirstName').value;
var
LastName = document.getElementById('LastName').value;
var
Company = document.getElementById('Company').value;
var
Email = document.getElementById('Email').value;
var
errors = "";
if
(FirstName == "") {
errors += "Please
enter your First name.\n";
}
if
(LastName == "") {
errors += "*
Please enter your last name.\n";
}
if
(Company == "") {
errors += "*
Please enter your company name.\n";
}
if
(Email == "") {
errors += "*
Please enter your email address.\n";
}
if
(errors.length) {
alert('One
or more errors occurred:\n\n' + errors);
return
false;
}
}
</script>
Step 3. Run the page and check it, the validations will show like a validation summary of asp.net control.