C# 4.0 dynamic Keyword

This article is about "dynamic" keyword added to C# 4.0 and It is similar to "var" keyword in C# 3.0. It is a static type and Acts as a placeholder for Object/Field which is not known till runtime. The Type will be assigned only at the runtime.

About dynamic Keyword

1. "dynamic" is a new keyword added to C# 4.0
2. It is similar to "var" keyword in C# 3.0.
3. It is a static type.
4. It acts as a placeholder for Object/Field which is not known till runtime.
5. Type will assigned only at runtime

dynamic variable declaration

dynamic regNo = 10;
dynamic sname = "Sanjay";
Note: Datatype will be assigned to the variable at runtime, based on value stored in the variable.
GetType() Method is used to know the dynamic value's datatype.

dynamic value Conversion

dynamic values to other types are easy.
dynamic regNo = 10; // dynamic type
int intrNo = regNo; // Converting to integer type

dynamic sname = "Sanjay"; // dynamic type
string strN = sname; // Converting to String Type

Binding the object at runtime

1. Any object reference can be applied to the dynamic type object, later
dynamic object is used to invoke the method from the class.


//Define a class called calculator

using System;
class Calculator
public int Add(int a, int b)
return a + b;

static void Main(string[] args)
// statically binded
Calculator objC = new Calculator();
Console.WriteLine("Sum = " + objC.Add(10, 50));
// dynamically binded object
//Assign Calculator Class object reference to dynamic object dobjC
dynamic dobjC = new Calculator();
//Invoke the method using dynamic object.
Console.WriteLine("Sum " + dobjC.Add(10, 30));


  • dynamic keyword Example (43299-10354-dynamicOverlaoding.cs.txt)
  • Comments

    No responses found. Be the first to comment...

  • Do not include your name, "with regards" etc in the comment. Write detailed comment, relevant to the topic.
  • No HTML formatting and links to other web sites are allowed.
  • This is a strictly moderated site. Absolutely no spam allowed.
  • Name: