Getting started with Linq, some problems...

Today i started with LINQ, i've got a simple table in my database, i like to read something from the table and use linq with it.
So, my table is:
CREATE TABLE [dbo].[tblMovies](
 [id] [int] IDENTITY(1,1) NOT NULL,
 [Header] [nvarchar](250) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
 [Teaser] [text] COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
 [Auteur] [nvarchar](100) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
 [Filename] [nvarchar](100) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
 CONSTRAINT [PK_tblMovies] PRIMARY KEY CLUSTERED
(
 [id] ASC
)WITH (PAD_INDEX  = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

With a normal function i can normally read items from the table.
But i want to practice with LINQ, so i build this:
if(!IsPostBack)
        {
       ...