dynamic vs object type

Question

I have used the dynamic and the object type interchangeably. Is there any difference between these two types? Is there any performance implications of using one over the oth

Answer 1

In simple language:
Assume we have the following method:

public static void ConsoleWrite(string inputArg)
{
    Console.WriteLine(inputArg);
}

Object: the following code has compile error unless cast object to string:

public static void Main(string[] args)
{
    object obj = "String Sample";
    ConsoleWrite(obj);// compile error
    ConsoleWrite((string)obj); // correct
    Console.ReadKey();
}

dynamic: the following code compiles successfully but if it contains a value except string it throws Runtime error

public static void Main(string[] args)
{
    dynamic dyn = "String Sample";
    ConsoleWrite(dyn); // correct
    dyn = 1;
    ConsoleWrite(dyn);// Runtime Error
    Console.ReadKey();
}