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 arrays, lists and XML files.For beginners programmers.CONTENTSPart 1. C# basicsInput and output PurchaseSelecting Income Resistance Mass of rodLoops Monthly payments Minimum monthly payment Table of trigonometric functions Cube rootArrays Mean Average salary Minimal element of array Sorting an array Sorting an array (bubble method) Binary search Matrix and vector Results of competitions Mass of rodPart 2. C# intermediateLists Strings listFunction Volume of hollow rod CubeRoot Resistance Factorial Quadratic equation Function overloadingFiles User folders Reading from file Writing to fileClasses and objects Using class String Class TRod Class Person Array of objects List of objects Sorting list of objects File of objects InheritanceLINQ Array processing Selection data from string array List processing Creating an XML document Processing of an XML documentExceptions Format exception Safe integer input Safe float inputСonclusion