LINQ (Language Integrated Query) is one of the most powerful features in .NET, providing a unified syntax to query collections, databases, XML, and other data sources. Below are 20+ important LINQ concepts, their explanations, and code snippets to help you understand their usage. 1. Where (Filtering) The Where() method is used to filter a collection based on a given condition. var numbers = new List < int > { 1 , 2 , 3 , 4 , 5 , 6 } ; var evenNumbers = numbers . Where ( n => n % 2 == 0 ) . ToList ( ) ; // Output: [2, 4, 6] C# Copy 2. Select (Projection) The Select() method projects each element of a sequence into a new form, allowing transformation of data. var employees = new List < Employee > { /* ... */ } ; var employeeNames = employees . Select ( e => e . Name ) . ToList ( ) ; // Output: List of employee names C# Copy 3. OrderBy (Sorting in Ascending Order) The OrderBy() method sorts the elements of a sequence in ascendi
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