How do you convert 3 bytes into a 24 bit number in C#? -

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I have an array of bytes, which I read from the header section of the message. These bytes contain the length of the message. Never exceed 3 bytes and they are ordered from LSB to MSB. So in the example below, there are 39 LSBs and 2 MSBs. 

  var data = new byte [] {39, 213, 2};

In the above example, how can I take those bytes and convert to a number (int, short, etc.)? 

  var num = data [0] + (data [1]

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