If you include it in you grouped result then you can use it. Please help, I have the following DataTables, which I want to use LINQ with. 发表时间：2022-05-05作者：Dev Beginner . Hi All, I want all columns from this query but when I select it as : (Select new { “column1” “column2”} it doesn’t work. The Join operator joins two sequences (collections) based on a key and returns a resulted sequence. Get free online cour. If an element in the first collection has no matching elements, it does not appear in the result set. and … Joining Operator: Join. Updated 10-Nov-10 7:11am JF2015. LINQ linq join on multiple columns. C# Copy Code var referrers = from r in Referrers from ri in Referrer_Info where r.ServerConnectionID == ri.ServerConnectionID && r.ReferrerID == ri.ReferrerID select r; This successfully executes my multi-column join. The Join operator joins two sequences (collections) based on a key and returns a resulted sequence. Linq with multiple table joins, ordering and grouping. Written by on May 31, 2022. Joins. LINQ to SQL: Multiple joins ON multiple Columns. Is this possible? A function named GetData is used to fetch the records from the Customers table and return them in the form of a DataTable. There is a table I want to join with different columns in different tables. C# Linq Group By on Multiple Columns. join on multiple columns - social.msdn.microsoft.com Then you can group by multiple columns using another LINQ query as I've done above. linq join on multiple columns - intsika.com SQL Join Query With LINQ Program to Join Multiple Data Sources using LINQ Join two tables using LINQ to Entities, then group and total the columns from each tables.