Get data from Table using dataTable using c#.net

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Get data from Table using dataTable using c#.net

 static public DataTable getData(string selectstr)
        {
            string connectionString = "";
            OleDbConnection connection = null;
            OleDbDataAdapter adp = null;
            OleDbCommandBuilder oleDbCommandBuilder = null;
            DataTable dataTable = null;
            connectionString = ConfigurationSettings.AppSettings["ConnectionString"];
            connection = new OleDbConnection(connectionString);
            connection.Open();
            adp = new OleDbDataAdapter(selectstr, connection);
            oleDbCommandBuilder = new OleDbCommandBuilder(adp);
            dataTable = new DataTable();
            adp.Fill(dataTable);
            connection.Close();
            return dataTable;
        }

Some Companies list All over World

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Companies	City	Region	Country
Jordan Data Communications Company Llc	Amman	Amman Governorate	Jordan
Godrej Infotech Limited	Mumbai	Maharashtra	India
Bharti Broadband	Delhi	Delhi	India
Tata Teleservices Ltd - Tata Indicom - Cdma Divisi	Mumbai	Maharashtra	India
Excell Media Pvt Ltd	Hyderabad	Andhra Pradesh	India
Reliance Communications	Pune	Maharashtra	India
Bharti Broadband	Bangalore	Karnataka	India
Acd Elektronik Gmbh	Almersbach	Rheinland-pfalz	Germany
Mts Allstream	Toronto	Ontario	Canada
Tata Communications	Gurgaon	Haryana	India
Telekom Malaysia Berhad	Petaling Jaya	Kuala Lumpur	Malaysia
Delhi-vsb- Leased Line Tata Teleservices Ltd	Chandigarh	Chandigarh	India
Microsoft Corp			Asia/pacific Region
Tata Teleservices Isp	New Delhi	Delhi	India
Telenet N.v.	Brussels	Brussels Hoofdstedelijk Gewest	Belgium
Porini Spa	Como	Lombardia	Italy
Net4india Ltd.	Delhi	Delhi	India
3bb Broadband	Bangkok	Krung Thep	Thailand
Ptv Swiss Ag	Bern	Bern	Switzerland
Tata Communications	Ahmadabad	Gujarat	India
Tele Danmark	Værløse	Hovedstaden	Denmark
Reliance Communications	Madras	Tamil Nadu	India
Upc Polska Sp. Z O.o.	Piotrków Trybunalski	Piotrkow	Poland
Risc Group It Solutions	Neuilly-sur-seine	Ile-de-france	France
Reliance Communications	Hyderabad	Andhra Pradesh	India
Uecomm	Melbourne	Victoria	Australia
Cooperatieve Handelsvereniging Salo Ua.	Huizen	Noord-holland	Netherlands
Miedzynarodowe Centrum Szkolen I Kompetencji Mcsk	Trzebinia	Slaskie	Poland
Vtx Services Sa	Zürich	Zurich	Switzerland
Wells Fargo & Company	San Francisco	California	United States
Wireless Client Network	Aizkraukle	Aizkraukles	Latvia
Sfr	Paris	Ile-de-france	France
Black Box Network Services	Washington	Pennsylvania	United States
Aircel Gprs Customer-south Region	Madras	Tamil Nadu	India
Telenet N.v.	Antwerp	Antwerpen	Belgium
Unet B.v.	Amsterdam	Noord-holland	Netherlands
Comcast Business Communications	Portland	Oregon	United States
Wipro Technologies	Bangalore	Karnataka	India
Press Ganey Associates	South Bend	Indiana	United States
Mcm Telecom Ltda.	São Paulo	Sao Paulo	Brazil
France Telecom	Paris	Ile-de-france	France
Turk Telekom	Antalya	Antalya	Turkey
Pacific Internet (australia) Pty Ltd	Long Jetty	New South Wales	Australia
Mumbai-lvsb- Leased Line Tata Teleservices Ltd	Mumbai	Maharashtra	India
Green Beacon Solutions	Boston	Massachusetts	United States
Beijing Teletron Telecom Engineering Co., Ltd.	Beijing	Beijing	China
Tata Communications	Mumbai	Maharashtra	India
Voestalpine Informationstechnologie Gmbh	Linz	Oberosterreich	Austria
Shaw Communications	Calgary	Alberta	Canada
Bayantel Dsl Infrastructure	Quezon City	Quezon City	Philippines
Broadband Network Services	Litija	Bohinj	Slovenia
American International Group Data Center	Houston	Texas	United States
Epm Telecomunicaciones S.a. E.s.p.	Medellín	Antioquia	Colombia
Global Crossing	Atlanta	Georgia	United States
Casper	Istanbul	Istanbul	Turkey
Qwest Communications	Salt Lake City	Utah	United States
Stella-gading	Jakarta	Jakarta Raya	Indonesia
Eg A/s	Kolding	Syddanmark	Denmark
T.c.c Technology Co., Ltd.	Bangkok	Krung Thep	Thailand
Cps	Hurlingham	Buenos Aires	Argentina
Axelero Co, Hungarian Telecom (matav) Group	Budapest	Budapest	Hungary
E-quest Automatisering B.v.	Gemert	Noord-brabant	Netherlands
Beam Telecom Pvt Ltd	Hyderabad	Andhra Pradesh	India
British Telecommunications	Nottingham	Nottingham	United Kingdom
Comcast Business Communications	Olive Branch	Mississippi	United States
The Brussels Airport Company	Brussels	Brussels Hoofdstedelijk Gewest	Belgium
Clients First Business Solutions	Walnut Creek	California	United States
Cox Communications	Rocky Hill	Connecticut	United States
Philippine Long Distance Telephone	Makati	Manila	Philippines
Bonair S.a.	Warsaw	Mazowieckie	Poland
Telemach, Communication Services, D.o.o.	Ljubljana	Bohinj	Slovenia
City Telecom (h.k.) Ltd.	Central District		Hong Kong
Turk Telekom	Istanbul	Istanbul	Turkey
Netia Sa	Warsaw	Mazowieckie	Poland
Cyber Internet Services (pvt.) Ltd.	Karachi	Sindh	Pakistan
Cellco Partnership Dba Verizon Wireless	Fort Mc Coy	Florida	United States
Accenture	Hyderabad	Andhra Pradesh	India
Korea Telecom	Seoul	Seoul-t'ukpyolsi	Korea, Republic Of
Bredbandsbolaget Ab	Göteborg	Vastra Gotaland	Sweden
Collezione-net	Istanbul	Istanbul	Turkey
Proforma	Independence	Ohio	United States
Blue Horseshoe	Carmel	Indiana	United States
Tech-trans System Ltd.	Cheung Sha Wan		Hong Kong
Vads Sdn Bhd	Kuala Lumpur	Kuala Lumpur	Malaysia
Caja De Ahorros Y Monte De Piedad De Zaragoza	Zaragoza	Aragon	Spain
Qurius Is Bv	Gaal	Noord-brabant	Netherlands
Hydroscand Ab	Stockholm	Stockholms Lan	Sweden
Telecom Xtra			New Zealand
Spcc7300i09consumer	Makati	Manila	Philippines
Xs4all Internet Bv	Amsterdam	Noord-holland	Netherlands
Saudinet, Saudi Telecom Company	Jiddah	Makkah	Saudi Arabia
Qwest Communications	Littleton	Colorado	United States
Ojsc Sibirtelecom	Novosibirsk	Novosibirsk	Russian Federation
Swu Telenet Gmbh	Ulm	Baden-wurttemberg	Germany
Aircel Gprs Customer Chennai	Bangalore	Karnataka	India
Vda Informatiebeheersing Bv	Hilversum	Noord-holland	Netherlands
Companhia De Telecomunicacoes Do Brasil Central	Carapicuíba	Sao Paulo	Brazil
Reliance Communications	Bangalore	Karnataka	India
Hathway Cable And Datacom Pvt Ltd	Mumbai	Maharashtra	India
Zurn Plumbing Products Group	Erie	Pennsylvania	United States
Tt&t Co., Ltd.			Thailand
Key Technology	Walla Walla	Washington	United States
Telenet N.v.	Oud-turnhout	Antwerpen	Belgium
Qurius Czech Republic, S.r.o.	Olomouc	Olomoucky Kraj	Czech Republic
Fiber Optic Ip Network	Dnepropetrovsk	Dnipropetrovs'ka Oblast'	Ukraine
Sia Sdt Un It	Salaspils	Rigas	Latvia
Teliasonera Finland Oyj	Helsinki	Southern Finland	Finland
Brightnet Internet	Goshen	Indiana	United States
Attentive A/s	Risskov	Midtjyllen	Denmark
Gebze Organize Sanayi Bolgesi Teknopark A.s.	Izmit	Kocaeli	Turkey
Emirates Telecommunications Corporation	Dubai	Dubai	United Arab Emirates
Nib (national Internet Backbone)	Madras	Tamil Nadu	India
Skytec Ag	Munich	Bayern	Germany
Ensign Resources	Calgary	Alberta	Canada
Net Serviços De Comunicação S.a..	Campinas	Sao Paulo	Brazil
Paetec Communications	Portland	Oregon	United States
Saasplaza Customer Subnet			Netherlands
Disc Makers (kurlanski, Jozef)	Pennsauken	New Jersey	United States
Mediacom Communications Corp	Berkeley	California	United States
Assel Sp. Z O.o.	Pruszcz Gdanski	Pomorskie	Poland
Belgacom Skynet			Belgium
Comparex Deutschland Ag			France
Telecentro S.a.	Lomas De Zamora	Buenos Aires	Argentina
Conecel	Guayaquil	Guayas	Ecuador
Telstra Internet	Brisbane	Queensland	Australia
Tata Communications	Calcutta	West Bengal	India
Lafrance Internet Services	Fremont	California	United States
Xfab Semiconductor Foundries Ag			Germany
Alestra, S. De R.l. De C.v.	Morelia	Michoacan De Ocampo	Mexico
Wmdata Isit	Stockholm	Stockholms Lan	Sweden
Innsbrucker Kommunalbetriebe Ag	Innsbruck	Tirol	Austria
Ece Projektmanagement Gmbh & Co. Kg			Germany
Comcast Business Communications	Chicago	Illinois	United States
Cablevision Systems Corp.	Wayne	New Jersey	United States
Telia Stofa A/s	ålborg	Nordjylland	Denmark
Charter Communications	Walla Walla	Washington	United States
Solusi Internet Service Provider	Jakarta	Jakarta Raya	Indonesia
Gts Czech S.r.o.	Blovice	Plzensky Kraj	Czech Republic
Sbc Internet Services	Jacksonville	Florida	United States
Ashland Fiber Network	Medford	Oregon	United States
Mts Allstream	Mississauga	Ontario	Canada
Paknet Limited	Faisalabad	Punjab	Pakistan
Sygnity	Wroclaw	Dolnoslaskie	Poland
Schutte Systems Bv	Enschede	Overijssel	Netherlands
British Telecommunications	Stockport	Stockport	United Kingdom
Ngi Spa			Italy
Tata Communications	Madras	Tamil Nadu	India
Meditel	Casablanca	Casablanca	Morocco
Bourjois C O Natexis Altair	Neuilly-sur-seine	Ile-de-france	France
Entel Chile S.a.	Santiago	Region Metropolitana	Chile
Union Underwear Company	Miami	Florida	United States
National Oilwell Varco	Houston	Texas	United States
Open Computer Network	Tokyo	Tokyo	Japan
France Telecom	La Rochette	Rhone-alpes	France
Mobile Live Service	Amsterdam	Noord-holland	Netherlands
Dcf Route-lan For De Friesland Zorgverzekeraar	Leeuwarden	Friesland	Netherlands
Ccnet Services	New York	New York	United States
Dialin	Suben	Oberosterreich	Austria
Rogers Cable	Collingwood	Ontario	Canada
Imerys Pigments	Roswell	Georgia	United States
You Broadband & Cable India Ltd.	Ahmadabad	Gujarat	India
Wang Laboratories			Europe
Communication Solutions Ltd.	Mombasa	Coast	Kenya
Swiss Bankers Travellers			Switzerland
Avon Products Incorporated	Stamford	Connecticut	United States
Smart Comp. A.s.	Brno	Jihomoravsky Kraj	Czech Republic
Upc Internet Catv	Prague	Hlavni Mesto Praha	Czech Republic
Routed Connection	Hirwaun	Rhondda Cynon Taff	United Kingdom
Pi Punkt Sp. Z O.o.	Lambinowice	Opolskie	Poland
Lyse Tele	Figgjo	Rogaland	Norway
Central Online Assignment Ip	Jakarta	Jakarta Raya	Indonesia
Calberson	Paris	Ile-de-france	France
	Hyderabad	Andhra Pradesh	India
Connected By Gts Poland	Poreba	Malopolskie	Poland
Go P.l.c.	Birkirkara		Malta
Telecom Italia	Perugia	Umbria	Italy
Rajeshnet	Mumbai	Maharashtra	India
Telekom Austria	Steinakirchen	Niederosterreich	Austria
Noc - Telecom El Salvador	San Salvador	San Salvador	El Salvador
Scan Source	Greenville	South Carolina	United States
Joint Stock Company Teo Lt, Ab	Kaunas	Kauno Apskritis	Lithuania
Time Telecommunications Sdn Bhd	Petaling Jaya	Kuala Lumpur	Malaysia
Airtel Broadband And Telephone Services, Karnataka	Bangalore	Karnataka	India
Aviagen	Huntsville	Alabama	United States
Reliance Communications	Jajpur	Orissa	India
Aircel Gprs Customer-south Region	Bangalore	Karnataka	India
Kabel Deutschland Breitband Services Gmbh	Augsburg	Bayern	Germany
Ncnet Broadband Customers	Moscow	Moscow City	Russian Federation
Tw Telecom Holdings	Charlotte	North Carolina	United States
Tabor Realty Trust	Canton	Massachusetts	United States
Optimum Online	Fair Lawn	New Jersey	United States
Africonnect Zambia Ltd	Kitwe	Central	Zambia
Windstream Communications	Cazenovia	New York	United States
Brennan Voice And Data Pty Ltd	North Sydney	New South Wales	Australia
Scansafe Lon	London	London	United Kingdom
Mts Allstream	Calgary	Alberta	Canada
Orcon Internet Ltd	Auckland	Auckland	New Zealand
Deutsche Telekom Ag	Burscheid	Nordrhein-westfalen	Germany
Com Hem Ab	Helsingborg	Skane Lan	Sweden
Dell	Round Rock	Texas	United States
Telecom Plus Ltd	Beau Bassin	Plaines Wilhems	Mauritius
Turnkey Services Ag	Root	Luzern	Switzerland
Bowling Green State University	Bowling Green	Ohio	United States
Uninet S.a. De C.v.	Mérida	Yucatan	Mexico
Hiawatha Broadband Comm	Winona	Minnesota	United States
Rcs & Rds S.a.	Iasi	Iasi	Romania
Waoo A/s	Virum	Hovedstaden	Denmark
Studio Moderna D.o.o.	Kamnik	Bohinj	Slovenia
Rogers Cable	Brampton	Ontario	Canada
American Apparel	Los Angeles	California	United States
Oy Know It Tampere Ab	Tampere	Western Finland	Finland

Symbols in ER Diagrams

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Symbols in ER Diagrams

Rectangle : Entity set
Ellipse  : Attribute
Diamond : Relation
Lines  : links attribute to entity or relation and entities to relations
Double ellipse : multivalued attribute
Dashed ellipse : derived attribute
Double line : total participation of entity in relationship set
Inverted triangle : Links sub-type entities with super-type entity