Just a moderate question

Let's say you have this solution structure:

Solution 'ConsoleApplication2' (2 projects)
|- ClassLibrary1
| |- Class1.cs
|
|- ConsoleApplication2
   |- Program.cs

In Class1.cs, you define:

namespace ClassLibrary1
{

    public class Class1
    {
        public const int ItemPrice = 500;
    }
}

In Program.cs, you define:

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)

        {
            Console.WriteLine(ClassLibrary1.Class1.ItemPrice * 2);

            Console.ReadLine();
        }

    }
}

You have deployed your ConsoleApplication2 application into two different PCs.
Now, you change the value of ItemPrice constants into 1000 and then you compiled the ClassLibrary1 library.

How do you deploy the changes to the two PCs?
Do you just need to deploy the ClassLibrary1 assembly or else?
And why?