Dahai is known as decade in English. Century is known as Sadee.

Sentence:

Mahmood began his film career by acting in films like Badnaam in 50's OR in the decade of 1950.

I am pasting hereinbelow some of the references from Google hits for your perusal which have the usage of above expression:

Tierra del Fuego Argentina travel guide
... where the most dangerous criminals were sent. In the decade of 1950
it became an important naval base. Today in the port you can ...
www.patagonias.net/Cities/tierra-del-fuego.htm - 16k - Cached - Similar pages

Glasses Make Myopia Worse
... decade of 1950. In the decade of 1950, the fitting and wearing of
minus glasses became the rule rather than the exception. In the ...
www.i-see.org/against_glasses.html - 5k - Cached - Similar pages

Amarillo, Texas and Amarillo Discount Hotel Reservations.
... Amarillo grew 85% in the decade of 1950-1960, from 74,000 to 138,000.
The population in 1980 was 149,000 and in 1990 it was 158,000. ...
www.texasescapes.com/TOWNS/Amarillo/Amarillo_Texas.htm - 26k - Cached - Similar pages

Plant 5: Farrel-Birmingham and the Rapid Reversal Engine ...
... seemingly overnight. In the decade of 1950 through 1960, the population
almost doubled with a final figure of over 100,000 people. If ...
www.buffalohistoryworks.com/ plant5/turnover/Welcome.html - 10k - Cached - Similar pages

MESHLESS METHODS
The Finite Element Method (FEM), firstly appeared in the decade of 1950, has become
the most popular numerical method in Computational Mechanics, both in ...
mmcyte7.cps.unizar.es/meshless.htm - 9k - Cached - Similar pages

Merida
... mosaic. With this same technique, in the decade of 1950 he carried out
diverse murals for companies commercial and private Mexicans. ...
www.galartes.com/painters/merida.htm - 6k - Cached - Similar pages

Analysis of social acceptances
... Huruluwewa colony consists of farmer families who came from different parts
of the country under colonisation project in the decade of 1950. ...
ybiol.tripod.com/forest/99sympo/9935hera.htm - 11k - Cached - Similar pages

Renovation of a City
... The renovation of la Montée de la Grande Côte : in the decade of 1950, the area
of la Montée de la Grande Côte was an insalubrious and bad frequented area ...
multimedia.zawiw.uni-ulm.de/ zope/solill/Arbeitsergebnisse/housing/lyon - 22k - 25 Jul 2004 - Cached - Similar pages

Issues and thought in Malay historical drama
... The objective of the study is to analyse the development of drama in
the decade of 1950's and 1960's and analyse the writers' thought. ...
uru.upm.edu.my/iresearch.nsf/0/ 1e0d057d4f554d44482569d6005d9eb5?OpenDocument - 8k - Cached - Similar pages

Pio Pio house Rooms rental in Havana Cuba. Apartments, private ...
... bed. Rooms in an apartment of it magnifies quality, a building built
in the decade of 1950 with very good conservation state. Wide ...
www.geocities.com/rooms_havana/ eng/recomended/house_piopio_renting.htm - 74k - Cached - Similar pages

You may also like to have a look at the following reference in respect of usage of 50's:

The Music of the Fifties - Oldies but Goodies
The Fifties Website looks at the Music of the 50's - all the
hit records, all the stories, all the stars and more. ...
www.fiftiesweb.com/music.htm - 25k - Cached - Similar pages
[ More results from www.fiftiesweb.com ]

Real Audio Music Oldies 50s 60s 50's 60's Nostalgic Nostalgia ...
I am a throwback to the 50's, 60's and early 70's. ... Hear Thousands of
Full-Length STEREO Oldies Songs from the 50's to the early 70's. ...
www.wanderers.com/wanderer/ - 7k - Cached - Similar pages

Real Audio Oldies Music Songs Wanderer 50's 60's 50s 60s 1950s ...
... Over 6,000,000 Unique surfers have visited this Music site! * The Wanderer * No
Cookies, No Advertising, just pure 50's-60's Oldies Music! IMPORTANT NOTICE!! ...
www.wanderers.com/menu.html - 10k - Cached - Similar pages

retro fifties 50s decade Cars Idols Pictures clip art and pin up ...
... Cool Kittens and Sandra Dee's. Site contains over 400 Photos of Cars,
Vintage Posters, Pinups, and Clipart, all about the 50's. ...
www.loti.com/ - 14k - 25 Jul 2004 - Cached - Similar pages