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Navigator: Home - Tutorials - Advanced Technologies - Generating Random Passwords with ASP.NET and C#
Generating Random Passwords with ASP.NET and C#


ASP.NET Advanced Technologies Tutorial

This tutorial shows how we can use C# to generate a random password. C# version.

Generating random passwords can increase the security of a website by taking the process out of the hands of the user, or simply providing an alternative, and thus reducing the chance of easily-guessable passwords being used. This tutorial shows a simple method of creating a random password.

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First, we create the ASPX page:
<form id="form1" runat="server">
<div>
Enter Required Password Length:
<asp:TextBox ID="TextBox1" runat="server" Columns="2" MaxLength="2"></asp:TextBox><br />
<asp:Label ID="Label1" runat="server"></asp:Label><br />
<asp:Button ID="Button1" runat="server" Text="Generate Password" OnClick="Button1_Click" />
</div>
</form>

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The simple method is shown below. This is how the code-behind should look:

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
Label1.Text = "Please enter a password length (e.g. 8)";
}
TextBox1.Text = "8";
}

public static string CreateRandomPassword(int PasswordLength)
{
string _allowedChars = "abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ0123456789";
Random randNum = new Random();
char[] chars = new char[PasswordLength];
int allowedCharCount = _allowedChars.Length;

for (int i = 0; i < PasswordLength; i++)
{
chars[i] = _allowedChars[(int)((_allowedChars.Length) * randNum.NextDouble())];
}

return new string(chars);
}

protected void Button1_Click(object sender, EventArgs e)
{
if (TextBox1.Text != "")
{
string myInt = TextBox1.Text.ToString();
Label1.Text = "Your generated password is: " + CreateRandomPassword(int.Parse(myInt));
}
}
}

Looking for the VB.NET 2005 Version? Click Here!

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