how to write join query in linq c#
var locationInfo = entities.TagTemperatures // your starting point - table in the "from" statement
.Join(entities.ReverseGeoFenceAddresses, // the source table of the inner join
tt => tt.TagTemperatureId, // Select the primary key (the first part of the "on" clause in an sql "join" statement)
rg => rg.TagTemperatureId, // Select the foreign key (the second part of the "on" clause)
(tt, rg) => new { TT = tt, RG = rg }) // selection
.Where(TTandRG => TTandRG.TT.TagId == tag.TagId && TTandRG.TT.SampleTime > StartDate && TTandRG.TT.SampleTime < EndDate)
.Select(X => new { X.TT.Latitude, X.TT.Longitude, X.TT.SampleTime, X.TT.TemperatureCelsius, X.TT.isAlert, X.TT.isYAlert, X.RG.FullAddress }).ToList(); // where statement