• It can store any kind of value because object is a base class of all type in .net framework.

  object obj;

• object is not type safety.
• object is initialize with null.
• object type can be passed as method parameter and also can return object type.

  public object Method2(object param)
          {
              object objResponse = param;
              return objResponse;
          }
  

• Casting required.

Dynamic

• It can store any kind of value.

  dynamic obj;

• dynamic is not type safety
• dynamic is initialize with null
• dynamic type can be passed as method parameter and also can return dynamic type.

  public dynamic Method2(dynamic param)
          {
              dynamic objResponse = param;
              return objResponse;
          }
  

• Casting is not require but you need to know the property and methods related to stored type

Var

• It can store any kind of value but it is mandatory to initialize at time of declaration.

  var obj=10;
  

• var is type safety.
• Can’t initialize with null
• Can’t pass as method parameter and can not have return type as well
• Casting is not required.