As the title says, my goal is to JOIN two tables (target and transaction) on several columns, then group the result of that join and sum the values of columns from BOTH tables. query = query.Where (filter); } But, of course I lose the JOIN filters on the dates. Join with LINQ in C# I want to show you something else before we switch to the Left outer join. linq join on multiple columns - jtlbs.com If an element in the first collection has no matching elements, it does not appear in the result set. Here data source means list. SQL. Example. C# LINQ Joins With SQL - Dot Net Tricks The data table represents updates to existing customer info as well as new customer info. thanks [ProductId] = ( [t1]. Linq Join Multiple Columns - XpCourse I have done this before, but really could not remember the syntax, hence this post, for my furture reference, and hopefully helpful to others! MarkedItems is the new join and I think the problem could be the join on multiple columns or that I had to add the new table into the group by clause. Query Expression Linq to group multiple columns

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