Need Clarification on Instance in C#

Question

Hi , i need small clarification . what is instance and there is any different between instance variable and global variable ? Thanks in advance !!!!

Jebin Dhanush · Answer

Thank you sir !!

Sanwar Ranwa · Answer

Hello Jebin Dhanush Instance :An instance field, in C#, is a variable of any type contained within a class or struct, and is used to store object data. It is a member of its containing type with one copy of the field for each instance of the containing type. Instance fields represent the data of a class that enables an object to maintain its state. These fields are usually exposed as a property by which the internal implementation of the field can be changed as per the enhancements in the design of the class without introducing any breaking changes. This advantage negates the effect of the slight overhead in accessing the fields through properties. The main intent of designing instance fields is to encapsulate data that must be accessed by all the methods of the class and allow the data to be stored throughout the lifetime of the instance of the class. In addition, data can be prevented from accidental corruption by hiding it with the required level of accessibility. Global variable :A global variable is a variable accessible anywhere , for example a field "counter" type integer. The global variable can be accessed from any function or class within the namespace. C# is an object-oriented programming (OOP) language and does not support global variables directly. The solution is to add a static class containing the global variables. Using a global variable violates the OOP concept a bit, but can be very useful in certain circumstances. Check these Links for More details https://www.arclab.com/en/kb/csharp/global-variables-fields-functions-static-class.html https://stackoverflow.com/questions/14368129/c-sharp-global-variables https://www.dotnetperls.com/global-variable https://www.quora.com/What-is-the-difference-between-instance-object-and-variables-in-C