Introduction
In this post, I explain how to check password strength (policy) in the registration form in an ASP.Net Application.Prerequisite
I used followings:- .Net framework 4.0
Steps :
Just follow the steps and get result easily.Step - 1 : Create New Project
Go to File > New > Project > Select asp.net web forms application > Entry Application Name > Click OK.Step-2: Add a Web Form (page).
Go to Solution Explorer > Right Click on Project under solution explorer > Add > New item > Select Web Form Using master page> Enter Name > Add.Step-3: Design your Registration form
place this Html Code inside a form tag
<div>
<h3>Registration Form</h3>
<div>
<table cellpadding="0" cellspacing="10" border="0">
<tr>
<td>Full Name</td>
<td><asp:TextBox ID="txtFullName" runat="server" /></td>
<td></td>
</tr>
<tr>
<td>Username</td>
<td><asp:TextBox ID="txtUsername" runat="server" /></td>
<td></td>
</tr>
<tr>
<td>Password</td>
<td><asp:TextBox ID="txtPassword" runat="server" TextMode="Password" onKeyUp="checkPassStrength()" /></td>
<td><asp:Label ID="lblPasswordStrength" runat="server" /> </td>
</tr>
<tr>
<td></td>
<td><asp:Button ID="btnSave" runat="server" Text="Submit" OnClick="btnSave_Click" /></td>
<td></td>
</tr>
</table>
</div>
</div>
Step-4: Write Server side code for check password strength.
Here is the complete code :Inside submit Button Event
protected void btnSave_Click(object sender, EventArgs e)
{
int marks = GetPasswordStrength(txtPassword.Text);
string status = "";
switch (marks)
{
case 1:
status = "Very Week";
break;
case 2:
status = "Week";
break;
case 3:
status = "Medium";
break;
case 4:
status = "Strong";
break;
case 5:
status = "Very Strong";
break;
default:
break;
}
lblPasswordStrength.Text = "Status : " + status;
if (marks < 4)
{
lblPasswordStrength.ForeColor = Color.Red;
return;
}
// Do your registration Here
// This for test
lblPasswordStrength.ForeColor = Color.Green;
}
Function
private int GetPasswordStrength(string password)
{
int Marks = 0;
// here we will check password strength
if (password.Length < 6)
{
// Very Week
return 1;
}
else
{
Marks = 1;
}
if (Regex.IsMatch(password,"[a-z]"))
{
// 2 week
Marks++;
}
if (Regex.IsMatch(password, "[A-Z]"))
{
// 3 medium
Marks++;
}
if (Regex.IsMatch(password, "[0-9]"))
{
//4 strong
Marks++;
}
if (Regex.IsMatch(password, "[<,>,@,!,#,$,%,^,&,*,(,),_,+,\\[,\\],{,},?,:,;,|,',\\,.,/,~,`,-,=]"))
{
//5 very strong
Marks++;
}
return Marks;
}
Here run the application and Check result.
Here I have checked using server side code. It will much more useful if we check password strength from client side also. just follow the steps:-
Step-5: Add Client side code to check password strength.
Here we need to add the jquery library.for this add this function to head section.
<script src="Script/jquery-1.7.1.js"></script>
<script language="javascript" type="text/javascript">
function checkPassStrength() {
var value = $('#<%=txtPassword.ClientID %>').val();
var score = 0;
var status = "";
var specialChars = "<>@!#$%^&*()_+[]{}?:;|'\"\\,./~`-="
if (value.toString().length >= 8) {
if (/[a-z]/.test(value)) {
score += 1;
}
if (/[A-Z]/.test(value)) {
score += 1;
}
if (/\d/.test(value)) {
score += 1;
}
for (i = 0; i < specialChars.length; i++) {
if (value.indexOf(specialChars[i]) > -1) {
score += 1;
}
}
}
else {
score = 1;
}
if (score == 2) {
status = status = "<span style='color:#CCCC00'>Medium</span>";
}
else if (score == 3) {
status = "<span style='color:#0DFF5B'>Strong</span>";
}
else if (score >= 4) {
status = "<span style='color:#009933'>Very Strong</span>";
}
else {
status = "<span style='color:red'>Week</span>";
}
if (value.toString().length > 0) {
$('#<%=lblPasswordStrength.ClientID %>').html("Status :<span> " + status + "</span>");
}
else {
$('#<%=lblPasswordStrength.ClientID %>').html("");
}
}
</script>
and call this javascript function on key up of password textbox. Here is the code.
<asp:TextBox ID="txtPassword" runat="server" TextMode="Password" onKeyUp="checkPassStrength()" />
Step-6: Run Application.
Now type your password in the password field and get the result.Thank You
Download Source Code
