One to One relationships in LINQ

CREATE TABLE [dbo].[employees](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [Name] [varchar](50) NULL,
 CONSTRAINT [PK_employees] PRIMARY KEY CLUSTERED
(
    [ID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

CREATE TABLE [dbo].[addresses](
    [AddressID] [int] IDENTITY(1,1) NOT NULL,
    [EmpID] [int] NOT NULL,
    [Address] [varchar](50) NULL,
 CONSTRAINT [PK_addresses] PRIMARY KEY CLUSTERED
(
    [AddressID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

try {
              DataClasses1DataContext db = new DataClasses1DataContext();

              employee emp = new employee();
              emp.Name = "Bala";
              db.employees.InsertOnSubmit(emp);

              address add = new address();
              add.Address1 = "UK";
              add.employee = emp;
              db.addresses.InsertOnSubmit(add);

              db.SubmitChanges();
              MessageBox.Show("OK");

          } catch (Exception ex) {
              MessageBox.Show (ex.Message);
          }