root@generate-random:~/passwords/csharp$ _

Generate Random Passwords in C#

Complete code tutorial with examples and best practices

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[ Code Example - Quick Summary ]

Language: C#

What: Generate secure random passwords in C# using <code>RandomNumberGenerator</code> for cryptographically secure random data. Perfect for ASP.NET and .NET applications.

Try it: Use our interactive Passwords generator or integrate this code into your C# application.

Generate secure random passwords in C# using RandomNumberGenerator for cryptographically secure random data. Perfect for ASP.NET and .NET applications. Looking for other languages? Check our code examples in PHP , JavaScript , Python , Java , C++ , Ruby and Go or use our interactive web generator.

C# Code Example

using System;
using System.Security.Cryptography;
using System.Text;

class PasswordGenerator
{
    private const string Lowercase = "abcdefghijklmnopqrstuvwxyz";
    private const string Uppercase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    private const string Numbers = "0123456789";
    private const string Special = "!@#$%^&*()-_=+[]{}|;:,.<>?";

    public static string GeneratePassword(int length = 16, bool includeSpecial = true)
    {
        string chars = Lowercase + Uppercase + Numbers;
        if (includeSpecial)
        {
            chars += Special;
        }

        using (var rng = RandomNumberGenerator.Create())
        {
            var password = new StringBuilder(length);
            byte[] randomBytes = new byte[length * 4];
            rng.GetBytes(randomBytes);

            for (int i = 0; i < length; i++)
            {
                uint randomValue = BitConverter.ToUInt32(randomBytes, i * 4);
                password.Append(chars[(int)(randomValue % chars.Length)]);
            }

            return password.ToString();
        }
    }

    static void Main()
    {
        // Generate a 16-character password with special characters
        string password = GeneratePassword(16, true);
        Console.WriteLine(password);  // Example: aB3$xY7!mN2@pQ9&

        // Generate a 12-character password without special characters
        string simplePassword = GeneratePassword(12, false);
        Console.WriteLine(simplePassword);  // Example: aB3xY7mN2pQ9
    }
}

[EXPLANATION]

RandomNumberGenerator provides cryptographically secure random bytes. The method converts random bytes to indices for character selection, ensuring uniform distribution across the character set.