How do I get file's MD5 and compare it

void Main()
{
	// creating a temp file so the test will work on your machine.
        var tempFile1 = Path.GetTempFileName();
        // writing bytes which will be used to generate MD5 hash
	File.AppendAllText(tempFile1, "this is a test");
        // read all bytes of file so we can send them to the MD5 hash algo
	Byte [] allBytes = File.ReadAllBytes(tempFile1);
	System.Security.Cryptography.HashAlgorithm md5Algo = null;
	md5Algo = new System.Security.Cryptography.MD5CryptoServiceProvider();
        // compute the Hash (MD5) on the bytes we got from the file
	byte[] hash = md5Algo.ComputeHash(allBytes);
	Console.WriteLine(BytesToHex(hash));
      // output will be : 54B0C58C7CE9F2A8B551351102EE0938
     File.Delete(tempFile1);  // delete the temp file
      // Now you just need to do this for the second file and compare the strings.
	
}

private string BytesToHex(byte[] bytes) 
{ 
	// write each byte as two char hex output.
    return String.Concat(Array.ConvertAll(bytes, x => x.ToString("X2"))); 
}