Imports System.Data  

'读取，Select  
 
Dim Conn As New OleDb.OleDbConnection      '相当于server.CreateObject("adodb.connection")  
Dim Comm As New OleDb.OleDbCommand  
Dim Reader As OleDb.OleDbDataReader         '相当于server.CreateObject("adodb.recordset")  
Conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath("app_data/database.mdb") & ";user id=;password=;persist security info=true;"            '设置ConnectionString  
Conn.Open()     '相当于ASP里的Conn  
Comm.Connection = Conn       'ASP.Net必须的步骤，绑定连接组件  
Comm.CommandText = "select * from members where username='" & username & "'"       '设定sql命令  
Reader = Comm.ExecuteReader        '相当于rs.open sql,conn,1,1  
 
Reader.Read        '必须要先读才能使用Reader.Item("")  
 
Reader.Item("xx")              '相当于rs("xx")  
 
Reader.Read        '相当于rs.movenext  
 
 
 
 
 
'最后：  
 
Reader.Close  
 
Conn.Close  
 
'Comm不用关闭，Comm只是传达命令的中转站  
 
 
 
'执行命令  
 
Dim Conn As New OleDb.OleDbConnection      '相当于server.CreateObject("adodb.connection")  
Dim Comm As New OleDb.OleDbCommand  
 
Conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath("app_data/database.mdb") & ";user id=;password=;persist security info=true;"            '设置ConnectionString  
Conn.Open()     '相当于ASP里的Conn  
Comm.Connection = Conn       'ASP.Net必须的步骤，绑定连接组件  
Comm.CommandText = "update等语句" 
 
Comm.ExecuteNonQuery()      '相当于conn.execute sql

这些ASP.Net读取数据库代码是于ASP读取数据库最相似的代码，最容易被刚从ASP转入ASP.Net的朋友接受……