System.Random Next ulong (UInt64) extension

RandomExtensions.cs

/// <summary>
/// Extension methods for the <see cref="System.Random"/> class. 
/// </summary>
public static class RandomExtensions
{
    /// <summary>
    /// Returns a random unsigned ulong
    /// </summary>
    public static UInt64 NextUInt64(this Random random)
    {
        byte[] buffer = new byte[System.Runtime.InteropServices.Marshal.SizeOf(typeof(UInt64))];
        random.NextBytes(buffer);
        return BitConverter.ToUInt64(buffer);
    }
}