How dependency injection is loosely coupled

Question

How dependency injection is loosely coupled and how unit testing is easier using dependency injection. Can explain with simple example

Manas Mohapatra · Answer

Lets say there are two classes: Class1 and Class2 They both are tightly coupled because anything happens in Class2 it will affect Class1. Code looks like: public class Class1 { public Class2 Class2 { get ; set ; } } public class Class2 { } To make classes are loosely coupled we need to declare an interface like below: public class Class1 { public IClass2 Class2 { get ; set ; } } public interface IClass2 { } public class Class2 : IClass2 { } More on Dependency Injection please visit here: https://msdn.microsoft.com/en-us/library/ff921152.aspx

Bikesh Srivastava · Answer

see my article. http://www.c-sharpcorner.com/article/standard-application-architecture-in-mvc/