how to do sql server paging in sql server 2005 with help of example

CREATE PROC GetCustomersByPage

@PageSize int, @PageNumber int 

AS 

Declare @RowStart int 
Declare @RowEnd int 

if @PageNumber > 0 
Begin 

SET @PageNumber = @PageNumber -1 

SET @RowStart = @PageSize * @PageNumber + 1; 
SET @RowEnd = @RowStart + @PageSize - 1 ; 

With Cust AS 
     ( SELECT CustomerID, CompanyName, 
       ROW_NUMBER() OVER (order by CompanyName) as RowNumber 
       FROM Customers ) 

select * 
from Cust 
Where RowNumber >= @RowStart and RowNumber <= @RowEnd end

END

--SQL 2005 Paging Method Using Derived Table:
USE AdventureWorks
GO
DECLARE @StartRow INT
DECLARE @EndRow INT
SET @StartRow = 120
SET @EndRow = 140
SELECT FirstName, LastName, EmailAddress
FROM (
SELECT PC.FirstName, PC.LastName, PC.EmailAddress,
ROW_NUMBER() OVER(
ORDER BY PC.FirstName, PC.LastName,PC.ContactID) AS RowNumber
FROM Person.Contact PC) PersonContact
WHERE RowNumber > @StartRow
AND RowNumber < @EndRow
ORDER BY FirstName, LastName, EmailAddress
GO
--SQL 2005 Paging Method Using CTE:
USE AdventureWorks
GO
DECLARE @StartRow INT
DECLARE @EndRow INT
SET @StartRow = 120;
SET @EndRow = 140;
WITH PersonContact AS
(
SELECT PC.FirstName, PC.LastName, PC.EmailAddress,
ROW_NUMBER() OVER(
ORDER BY PC.FirstName, PC.LastName,PC.ContactID) AS RowNumber
FROM Person.Contact PC)
SELECT FirstName, LastName, EmailAddress
FROM PersonContact
WHERE RowNumber > @StartRow
AND RowNumber < @EndRow
ORDER BY FirstName, LastName, EmailAddress
GO