连接前台和后台数据库是一样的，问题是你想采用哪种技术连接数据库，每种连接都有所差别

1.C#连接连接Access

程序代码:

------------------------------------------------------------------------------- using System.Data;

using System.Data.OleDb;

..

string strConnection=Provider=Microsoft.Jet.OleDb.4.0;;

strConnection+=@Data Source=C:BegASPNETNorthwind.mdb;

OleDbConnection objConnection=new OleDbConnection(strConnection);

..

objConnection.Open();

objConnection.Close();

2.C#连接SQL Server

程序代码:

--------------------------------------------------------------------------------

using System.Data;

using System.Data.SqlClient;

..

string strConnection=user id=sa;password=;;

strConnection+=initial catalog=Northwind;Server=YourSQLServer;;

strConnection+=Connect Timeout=30;

SqlConnection objConnection=new SqlConnection(strConnection);

..

objConnection.Open();

objConnection.Close();

3.C#连接Oracle

程序代码:

--------------------------------------------------------------------------------

using System.Data.OracleClient;

using System.Data;

//在窗体上添加一个按钮，叫Button1，双击Button1，输入以下代码

private

void Button1_Click(object sender, System.EventArgs e)

{

string ConnectionString=Data Source=sky;user=system;password=manager;;//写连接串

OracleConnection conn=new OracleConnection(ConnectionString);//创建一个新连接

try

{

conn.Open();

OracleCommand cmd=conn.CreateCommand();

cmd.CommandText=select * from MyTable;//在这儿写sql语句

OracleDataReader odr=cmd.ExecuteReader();//创建一个OracleDateReader对象

while(odr.Read())//读取数据，如果odr.Read()返回为false的话，就说明到记录集的尾部了

{

Response.Write(odr.GetOracleString(1).ToString());//输出字段1，这个数是字段索引，具体怎么使用字段名还有待研究

}

odr.Close();

}

catch(Exception ee)

{

Response.Write(ee.Message); //如果有错误，输出错误信息

}

finally

{

conn.Close(); //关闭连接

}

}

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