Using 	System.Data;
Using 	System.Data.Common;
Using 	System.Data.SQLClient;
Using 	System.Data.OracleClient;
Using 	System.Data.ODBC;


Using 	System.Data.SQLClient;
----------------------------------------
Sql Connection --- SQL data
Sql Command --- SQL data  		-- Inser, Update, Delete
Sql DataReader --- SQL data		-- SELECT
Sql DataAdapter --- SQL data 	-- SELECT
Sql DataSet --- SQL data 		--  Adapter take data and transfer in DataSet



For SQL SERVER
<add name="MyCon" connectionString="User Id = sa; Password = ; Database =; DataSource = " providerName="System.Data.SqlClient"

