C#: Generate a random Decimal (also generate a random Int32)

        public static Decimal NextDecimal() {

            return new Decimal( new[] { NextInt32(), NextInt32(), NextInt32(), NextInt32() } );

        }

        public static int NextInt32() {

            unchecked {

                var firstBits = Instance.Next( 0, 1 << 4 ) << 28;

                var lastBits = Instance.Next( 0, 1 << 28 );

                return firstBits | lastBits;

            }

        }

        /// <summary>

        ///     A thread-local (threadsafe) <see cref="Random" />.

        /// </summary>

        public static Random Instance { get { return ThreadSafeRandom.Value; } }

        private static readonly ThreadLocal<SHA256Managed> Crypts = new ThreadLocal<SHA256Managed>( valueFactory: () => new SHA256Managed(), trackAllValues: false );

        /// <summary>

        ///     Provide to each thread its own <see cref="Random" /> with a random seed.

        /// </summary>

        public static readonly ThreadLocal<Random> ThreadSafeRandom = new ThreadLocal<Random>( valueFactory: () => {

            var hash = Crypts.Value.ComputeHash( Guid.NewGuid().ToByteArray() );

            var newSeed = BitConverter.ToInt32( hash, 0 );

            return new Random( newSeed );

        }, trackAllValues: false );