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  1. C# Driver
  2. CSHARP-1972

Performance of method ToHexString()

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      From several profiling sessions of my application I've noticed that method ToHexString() is used very often. DotTrace has also marked it as one of hot methods during profiling. I've found a solution which has about 40x speedup in compare with current implementation.
      Here's attached benchmarking info and code:

      BenchmarkDotNet=v0.10.5, OS=Windows 10.0.15063
      Processor=Intel Core i5-2400 CPU 3.10GHz (Sandy Bridge), ProcessorCount=4
      Frequency=3037251 Hz, Resolution=329.2451 ns, Timer=TSC
        [Host]     : Clr 4.0.30319.42000, 32bit LegacyJIT-v4.7.2046.0
        DefaultJob : Clr 4.0.30319.42000, 32bit LegacyJIT-v4.7.2046.0
       
       
                      Method |      Mean |     Error |    StdDev |
      ---------------------- |----------:|----------:|----------:|
       MongoDbImplementation | 97.146 us | 1.1451 us | 1.0711 us |
                   HandCoded |  1.932 us | 0.0216 us | 0.0202 us |
      

      Benchmark code: https://gist.github.com/ahydrax/477fedfe5a44bb49ff862b554694a4f1

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            ahydrax Viktor Svyatokha
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