The book is a set of examples of programs in C #. Programs of varying complexity are presented - from simple console applications that demonstrate the use of basic C # instructions and console input-output operations, to applications that demonstrate working with arrays, lists, files, functions, and objects. Presents the basics of LINQ technology to perform operations with various data sources: arrays, lists and XML files.For beginners programmers.CONTENTS PART 1. C# BASICSINPUT AND OUTPUTPurchaseSELECTINGIncomeResistanceMass of rodLOOPSMonthly paymentsMinimum monthly paymentTable of trigonometric functionsCube rootARRAYSMeanAverage salaryMinimal element of arraySorting an arraySorting an array (bubble method)Binary searchMatrix and vectorResults of competitionsMass of rod PART 2. C# INTERMEDIATELISTSStrings listFUNCTIONVolume of hollow rodCubeRootResistanceFactorialQuadratic equationFunction overloadingFILESUser foldersReading from fileWriting to fileCLASSES AND OBJECTSUsing class StringClass TRodClass PersonArray of objectsList of objectsSorting list of objectsFile of objectsInheritanceLINQArray processingSelection data from string arrayList processingCreating an XML documentProcessing of an XML documentEXCEPTIONSFormat exceptionSafe integer inputSafe float input СONCLUSION