Reference type in .NET

Question

Hi What is reference type? What is difference between value type and reference type? Thanks.

Gohil Jayendrasinh · Answer

Hi http://msdn.microsoft.com/en-us/library/t63sy5hs%28v=vs.80%29.aspx http://www.albahari.com/valuevsreftypes.aspx

Datta Kharad · Answer

Hi Refer these articles.. http://www.c-sharpcorner.com/UploadFile/jaishmathews/WorkingofReferenceTypeandValueType09102006022502AM/WorkingofReferenceTypeandValueType.aspx http://www.c-sharpcorner.com/uploadfile/gowth/difference-between-value-type-and-reference-type/

Priya Linge · Answer

Hi 1.All value based types are allocated on the stack. 2.All reference based types are allocated on the heap. 3.A value type contains the actual value. 4.A reference type contains a reference to the value. 5.When a value type is assigned to another value type it is copied. When a reference type is assigned to another reference type a reference is assigned to the value. 6.All value types are implicitly derived from System.ValueType. This class actually overrides the implementation in System.Object the base class for all objects which is a reference type itself. 7.Numeric data types such as integers floats etc boolean enumerations and user defined structures are value types. 8.Classes interfaces and delegates are reference types. Object string dynamic are the built in reference types. 9.Example : using System; using System.Collections.Generic; using System.Text; namespace CSApp1 { class Shape { public int length; public int width; public Shape() { length = 0; width = 0; } } // Make struct Rectangle to solve the Null reference exception problem class Rectangle { public Shape MyShape; } class MyClass { static void Main(string[] args) { Rectangle obj1; obj1.MyShape.length = 100; // will cause System.NullReferenceException System.Console.WriteLine(obj1.MyShape.length); } } } Hope this will help you. Thanks.