What are the differences between LINQ and SQL in C#?

What are the differences between LINQ and SQL in C#?

LINQ (Language Integrated Query) is a .NET framework component that adds native data querying capabilities to .NET languages. SQL (Structured Query Language) is a standard language for managing and manipulating databases. The main difference is that LINQ is integrated into C# and allows for type-safe queries, while SQL is a separate language used for database operations.

Can you give me an example of how to use LINQ in C#?

Sure! Here's a simple example:

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
        var evenNumbers = from n in numbers
                          where n % 2 == 0
                          select n;

        foreach (var num in evenNumbers)
        {
            Console.WriteLine(num);
        }
    }
}

This code filters even numbers from a list using LINQ.

How does LINQ improve code readability compared to SQL?

LINQ improves code readability by allowing developers to write queries directly in C# syntax, making it easier to understand the logic without switching contexts to SQL. The integration with C# also provides compile-time checking, reducing runtime errors.

Are there performance differences between using LINQ and SQL?

Yes, there can be performance differences. LINQ queries are translated into SQL queries, which means they can be optimized by the database engine. However, complex LINQ queries may introduce overhead. It's essential to analyze performance based on specific use cases.