在MSDN中，.net的数据库连接字符串都有详细的说明，本文以代码范例的方式罗列一些，具体的每一项代表的意义可以参看MSDN.

ADO.net 中数据库连接方式(微软提供)

微软提供供了以下四种数据库连接方式：

System.Data.OleDb.OleDbConnection

System.Data.SqlClient.SqlConnection

System.Data.Odbc.OdbcConnection

System.Data.OracleClient.OracleConnection

下面我们以范例的方式，来依次说明：

System.Data.SqlClient.SqlConnection常用的一些连接字符串(C#代码)：

SqlConnection conn 

= new SqlConnection(

"Server=(local);Integrated Security=SSPI;database=Pubs");

SqlConnection conn 

= new SqlConnection(

"server=(local)\\NetSDK;database=pubs;Integrated Security=SSPI");

SqlConnection conn = new SqlConnection(

"Data Source=localhost;Integrated Security=SSPI;Initial Catalog=Northwind;");

SqlConnection conn = new SqlConnection(

" data source=(local);initial catalog=xr;integrated security=SSPI;

persist security info=False;workstation id=XURUI;packet size=4096; ");

SqlConnection myConn = new 

System.Data.SqlClient.SqlConnection(

"Persist Security Info=False;Integrated 

Security=SSPI;database=northwind;server=mySQLServer");

SqlConnection conn = new SqlConnection( 

" uid=sa;pwd=passwords;initial catalog=pubs;

data source=127.0.0.1;Connect Timeout=900");

System.Data.OleDb.OleDbConnection常用的一些连接字符串(C#代码)：

OleDbConnection conn = new OleDbConnection(

@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=

D:\MyWeb\81\05\GrocerToGo.mdb");

OleDbConnection conn = new OleDbConnection(

@"Provider=Microsoft.Jet.OLEDB.4.0;Password=;

User ID=Admin;Data Source=grocertogo.mdb;"); 

OleDbConnection conn = new OleDbConnection(

"Provider=MSDAORA; Data Source=ORACLE8i7;

Persist Security Info=False;Integrated Security=yes"); 

OleDbConnection conn = new OleDbConnection(

"Provider=Microsoft.Jet.OLEDB.4.0; 

Data Source=c:\bin\LocalAccess40.mdb");

OleDbConnection conn = new OleDbConnection(

"Provider=SQLOLEDB;Data Source=MySQLServer;Integrated Security=SSPI");

System.Data.OracleClient.OracleConnection常用的一些连接字符串(C#代码)：

OracleConnection myConn = 

new System.Data.OracleClient.OracleConnection(

"Data Source=Oracle8i;Integrated Security=yes");

System.Data.Odbc.OdbcConnection常用的一些连接字符串(C#代码)：

OdbcConnection conn = new OdbcConnection(

"Driver={SQL Server};Server=MyServer;

Trusted_Connection=yes;Database=Northwind;");

OdbcConnection conn = new OdbcConnection(

"Driver={Microsoft ODBC for Oracle};Server=ORACLE8i7;

Persist Security Info=False;Trusted_Connection=yes");

OdbcConnection conn = new OdbcConnection(

"Driver={Microsoft Access Driver (*.mdb)};DBQ=c:\bin\nwind.mdb");

OdbcConnection conn = new OdbcConnection(

"Driver={Microsoft Excel Driver (*.xls)};DBQ=c:\bin\book1.xls");

OdbcConnection conn = new OdbcConnection(

"Driver={Microsoft Text Driver (*.txt; *.csv)};DBQ=c:\bin");

OdbcConnection conn = new OdbcConnection("DSN=dsnname");

其他厂商提供的数据库连接：

DB2Connection myConn = new IBM.Data.DB2.DB2Connection(

"DATABASE = SAMPLE;UID=; PWD=
            ;");

DB2Connection myConn = new IBM.Data.DB2.DB2Connection("DATABASE = SAMPLE"); 

BdpConnection myConn = new Borland.Data.Provider.BdpConnection("assembly=Borl

and.Data.Mssql,Version=1.1.0.0,Culture=neutral,PublicKeyToken=91d62ebb5b0d1b1b;ve

ndorclient=sqloledb.dll;osauthentication=False;database=;usernam

e=;hostname=;password=
            ;provider=MSSQL");

BdpConnection myConn = new Borland.Data.Provider.BdpConnection("assembly=Borl

and.Data.Db2,Version=1.1.0.0,Culture=neutral,PublicKeyToken=91d62ebb5b0d1b1b;ve

ndorclient=db2cli.dll;database=;username=;

password=
            ;provider=DB2");

Connection Pooling在SQL Server、OLE DB和.NET框架结构中的Data Provider中，都提供了隐式的连接池连接支持。你可以在ConnectionString中指定不同的参数值控制连接池的行为。比如下面的例子使OLE DB的连接池无效并自动地进行事务处理：

Provider=SQLOLEDB;OLE DB Services=-4;Data Source=localhost;Integrated Security=SSPI;

在SQL Server.NET Data Provider中提供了以下参数设置控制连接池的行为：Connection Lifttime、Connection Reset、Enlist、Max Pool Size、Min Pool Size和Pooling。

更多数据库连接信息，以及非ADO.net的连接字符串可以参看：