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الكل سهل متوسط صعب
What is LINQ in .NET, and how does Fluent API relate? سهل

LINQ (Language Integrated Query) → A set of features that brings query capabilities into C#.

Fluent API → A style of writing LINQ queries using method chaining (.Where().Select()) instead of SQL-like syntax.

Both achieve the same goal; Fluent API is essentially method syntax.

What are the advantages of using LINQ over traditional SQL queries or loops? سهل
  • Strongly typed, compile-time checking.
  • IntelliSense support in Visual Studio.
  • Readable and maintainable code.
  • Consistent querying across objects, XML, SQL, EF, etc.
What are Anonymous Types in LINQ, and when would you use them? سهل

Allow you to project results into objects without defining a class.

var result = from e in employees
             select new { e.Name, e.Salary };

Useful for temporary data shapes in queries.

What is the difference between Method Syntax and Query Syntax in LINQ? Which one is better? سهل

Query syntax → SQL-like (from e in employees where e.Age > 30 select e;).

Method syntax → Fluent chaining (employees.Where(e => e.Age > 30)).

Both compile to the same IL. Method syntax is more powerful (supports Join, GroupBy, etc.).