Generating Random Passwords with ASP.NET and C#

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)); } } }

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