How to execute two commands at the same time in SQL Server 2008

How I can execute two commands at the same time in SQL Server?

I want to get a row count of a table and some row according to the row count. For example I want to get row count of a table and assuming I want to get last 50 rows on a single page.

How can I do this?

EDIT 1):

Consider that I first get count and it return to me 100 and I want to get 80 to 100 recordsin this point another tansaction may delete 70 to 100 records and I can not get appropriate records

An inline count my be evaluated many times or may give different results. A separate CROSS JOIN approach will give different results at some point

See for why with repro script: can I get count() and rows from one sql query in sql server?

;WITH aCTE AS
(
    SELECT
       *,
       COUNT(*) OVER () AS TotalRows,
       ROW_NUMBER OVER (ORDER BY SomeLatest DESC) AS rn
    FROM
       MyTable
) foo
SELECT
   *
FROM
   foo
WHERE
   rn <= 50