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Advantage

There are many advantages of LINQ:-

• LINQ has full type checking at compile-time and IntelliSense support in Visual Studio. This powerful feature helps you to avoid run-time errors.
• LINQ supports various powerful features like filtering, ordering and grouping with minimum code.
• LINQ also allows debugging through .NET debugger.
• LINQ provides a uniform programming model (i.e. common query syntax) to query data sources (like SQL databases, XML documents, ADO.NET Datasets, Various Web services and any other objects such as Collections, Generics etc.)
• LINQs Query can be reused.

Disadvantage

There are many disadvantages of LINQ:-

• LINQ doesn’t take the full advantage of SQL features like cached execution plan for stored procedure.
• LINQ performance is degraded if you don't write the LINQ query correctly.
• LINQ is not good to write complex queries like SQL.
• If you have done some changes in your query, you have to recompile it and redeploy its dll to the server.