Linq -Getting the difference of two columns

New to Linq. I am trying to do the following:

1. Select two fields. Each field exists in a different table
2. get the difference between those two fields.

How to do? Query is below. Any help would be greatly appreciated.

Jason

        private HeSubroReceived GetNetUnitValue(int currentClaim, int unitId)
        {
            decimal salvage=0.00;
            salvage = (from a in _subContext.Salvage where a.claim==currentClaim && 
            a.UnitId==unitId select SaleAmount);

            decimal unitValue=0.00;
 
            unitValue = (from b in _subContext.HeUnits where a.claim==currentClaim && a.UnitId==unitId select UnitValues);

            var NetUnitValue = new HeSubroReceived

            NetUnitValue=unitValue-salvage;
           
             return NetUnitValue;
               

        }
jazzcatoneAsked:
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jasonduanConnect With a Mentor Commented:
Your question is not very clear. However, is this what you are looking for?

var query = from a in _subContext.Salvage 
            join b in _subContext.HeUnits on new {UnitId = a.UnitId, Claim = a.claim} 
                                       equals new {UnitId = b.UnitId, Claim = b.claim} 
	    where a.UnitId == unitId && a.claim == currentClaim
	    select b.UnitValues - a.SaleAmount;
return query.FirstOrDefault();

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