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Password Generator in ASP.NET
This article illustrates how to create a simple password generator.
Create a new website in VS and add the following code that designs our aspx page.
Create a new website in VS and add the following code that designs our aspx page.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Password Generator</title>
<script type="text/javascript">
//Javascript function to allow only numeric values in the text box.
function isNumeric(keyCode) {
if (keyCode == 16)
isShift = true;
return ((keyCode >= 48 && keyCode <= 57 || keyCode == 8 || (keyCode >= 96 && keyCode <= 105)) && isShift == false);
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<b>Password Generator</b><br />
<br />
<table cellpadding="2">
<tr>
<td>
Password Length
</td>
<td>
<asp:TextBox ID="txtPassLength" runat="server" Width="180px" onkeydown = "return isNumeric(event.keyCode);"></asp:TextBox>
</td>
<td>
<asp:Button ID="btnGeneratePassword" runat="server" Text="Generate Password" OnClick="btnGeneratePassword_Click" />
</td>
</tr>
</table>
<asp:Label ID="lblPassword" runat="server" Text="Password" ForeColor="#993300"></asp:Label>
</div>
</form>
</body>
</html>
And it’s code behind as followsusing System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
private char[] _passCharactors = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789`~!@#$%^&*".ToCharArray();
private int _passLength = 0;
private string _password;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
lblPassword.Visible = false;
}
txtPassLength.Attributes.Add("onkeydown", "return isNumeric(event.keyCode);");
}
protected void btnGeneratePassword_Click(object sender, EventArgs e)
{
Random rnd = new Random();
if (!string.IsNullOrEmpty(txtPassLength.Text))
{
_passLength = Convert.ToInt32(txtPassLength.Text);
if (_passLength > 0)
{
for (int i = 0; i < _passLength; i++)
{
int randNumber = rnd.Next(0, _passCharactors.Length - 1);
_password += _passCharactors[randNumber];
}
lblPassword.Visible = true;
lblPassword.Text = "Your Password : " + _password;
}
}
else
{
lblPassword.Visible = true;
lblPassword.Text = "Please enter password length.";
}
}
}
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