This simple code produces deadlock. Simple Example Program included

Question

Code, notice the order of the values is different. So it alternates between locking rows:

static void Main( string[] args )
        {
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Answer 1

Agree with other answers as regards to the locking.

The more pressing question is what are you hoping to gain from this? There's only one cable those commands are travelling down.

You are probably making the overall performance worse by doing this. Far better to do your computation in parallel but serialize (and possibly batch) your updates.