Partial class

This program has three files. O/P expected is {1, E1, 10000} but no o/p at all. Please identify the error.

using System;

namespace PartialClassesAndMethodsDemoApp
{
partial class Employee
{
public override string ToString()
{
return "{" + EmployeeID + "," + Name + "," + Salary + "}";
}
}
}

--------------------------------------

using System;

namespace PartialClassesAndMethodsDemoApp
{
partial class Employee
{
public int EmployeeID;
public string Name;
public decimal Salary;
}
}

------------------------------------------

using System;

namespace PartialClassesAndMethodsDemoApp
{
class Program
{
static void Main(string[] args)
{
Employee emp = new Employee() { EmployeeID = 1, Name = "E1", Salary = 10000 };
}
}
}