Thank you @gpayne for your time and patience. I feel like a real heel 
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I believe that this is why the invented the command documented here: C# string.IsNullOrEmpty, IsNullOrWhiteSpace - Dot Net Perls
you could change your line to the following and it would have worked in either case:
if (string.IsNullOrEmpty(prOpDtl.ResourceID == false)
or for simpler statement you could even add the exclamation at the beginning :
if (!string.IsNullOrEmpty(prOpDtl.ResourceID)
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@jkane It was interesting learning. I came up with the below because I was getting (I thought) an error on the linq with !IsNullOrEmpty that works today. I have been working on routines similar to this for a few weeks and this exercise helped me understand the process better.
(JobOpDtl_Row.ResourceGrpID ?? "") != ""