C#怎么连接visual studio 2012 自带的数据库

            //下面这个就是来自上面的链接字符串。
            string strConn = @"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\Administrator\Documents\Visual Studio 2010\Projects\WindowsFormsApplication1\DevExpress\NORTHWND.MDF;Integrated Security=True;User Instance=True";
            SqlConnection conn = new SqlConnection(strConn);
            conn.Open();
            using (SqlCommand cmd = conn.CreateCommand())
            {
                cmd.CommandText = "Select * from Orders";

                DataSet ds = new DataSet();
                SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                adapter.Fill(ds);

                gridControl1.DataSource = ds.Tables[0];

                gridControl1.UseEmbeddedNavigator = true;
            }

首先visual studio是不自带数据库的，只能通过代码实现与数据库连接
c#数据库连接字符串集合
(一)常用连接:
1.使用SqlConnection对象:
a. Sql 验证
public void SqlConnectionOpen()
{
SqlConnection conn= new SqlConnection();
conn.ConnectionString = "user id=sa;password=;initial catalog=northwind;datasource=localhost;connect Timeout=20";
conn.Open();
}
b. Windows 身份验证
public void SqlConnectionOpen()
{
SqlConnection conn= new SqlConnection();
conn.ConnectionString = "Integrated Security=SSPI；initial catalog=northwind;datasource=localhost;connect Timeout=20";
conn.Open();
}

2.使用OleDbConnection对象:
public void OleDBConnectionOpen()
{
OleDBConnection conn = new OleDbconnection();
conn.ConnectionString="Provider=Microsoft.Jet.OLEDB.4.0;DataSource=C:\Customer.mdb";
conn.Open();
}
(二)其它:
1.ODBC连接Access本地数据库
conGoodDay.Open("Driver={Microsoft Access Driver(*.mdb)};"+"Dbq=C:\a.mdb;"+
"Uid=Admin;"+"Pwd=;");
2.ODBC连接Access系统数据库
conGoodDay.Open("Driver={Microsoft Access Driver(*.mdb)};"+"Dbq=C:\a.mdb;"+
"SystemDB=Admin;"+"Pwd=;");
3.ODBC连接Access系统数据库
conGoodDay.Open("Driver={Microsoft Access Driver(*.mdb)};"+"Dbq=\\server\share\a.mdb;");
4.ODBC连接Excel系统数据库
conGoodDay.Open("Driver={Microsoft Access Driver(*.xls)};"+"DriverId=790;"+
"Dbq=C:\a.xls;"+"DefaultDir=c:\somepath;");
5.ODBC连接Oracle系统数据库
conGoodDay.Open("Driver={Microsoft ODBC for oracle};"+"Server=OracleServer.world;"+
"Uid=Admin;"+"Pwd=password;");
6.ODBC连接Sql Servr
conGoodDay.Open("Driver={Sql Server};"+"Server=myServer;"+"Database=myDatabaseName;"
"Uid=Admin;"+"Pwd=password;");
7.ODBC连接Visual FoxPro
conGoodDay.Open("Driver={Microsoft Visual FoxPro Driver};"+
"SourceType=DBC;"+"SourceDB=c:a.dbc;"+"Exclusive=No;");

Windows 身份验证
建议使用 Windows 身份验证（有时也称为“集成安全性”）连接到支持其的数据源。连接字符串中使用的语法根据提供程序的不同而不同。下表演示用于 .NET Framework 数据提供程序的 Windows 身份验证语法。
语法
SqlClient
Integrated Security=true;
-- or --
Integrated Security=SSPI;

OleDb
Integrated Security=SSPI;

Odbc
Trusted_Connection=yes;

OracleClient
Integrated Security=yes;

Integrated Security=true 用于 OleDb 提供程序时会引发异常。

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