Generate a random string that is URL safe.

RandomTokenGenerator.cs

using System;
using System.Security.Cryptography;
using System.Web;

namespace DevPartners
{
    // author: Bill Wilder, @codingoutloud
    // original: https://gist.github.com/4200537
    public static class RandomTokenGenerator
    {
        /// <summary>
        /// Generate a random string that is URL safe.
        /// </summary>
        /// <param name="strength">Literally, number of base bytes in random sequence. The returned
        /// string is larger than the sequence of bytes since it is encoded to be URL safe.</param>
        /// <returns>Random URL-safe string. Can be used as part of query string.</returns>
        public static string GenerateUrlSafeToken(int strength = 16)
        {
            var random = new Random((int)DateTime.Now.Ticks);
            var randomBytes = new byte[strength];
            random.NextBytes(randomBytes); // fills randomBytes with random bytes
            var token = HttpServerUtility.UrlTokenEncode(randomBytes); // unlike straight-up Base64, safe in URLs
            return token;
        }

        /// <summary>
        /// Generate a cryptographically-random string that is URL safe. Slower than GenerateUrlSafeToken.
        /// </summary>
        /// <param name="strength">Literally, number of base bytes in random sequence. The returned
        /// string is larger than the sequence of bytes since it is encoded to be URL safe.</param>
        /// <returns>Random URL-safe string. Can be used as part of query string.</returns>
        public static string GenerateCryptographicUrlSafeToken(int strength = 16)
        {
            var random = new RNGCryptoServiceProvider();
            var randomBytes = new byte[strength];
            random.GetBytes(randomBytes); // fills randomBytes with random bytes
            var token = HttpServerUtility.UrlTokenEncode(randomBytes); // unlike straight-up Base64, safe in URLs
            return token;
        }
    }
}

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