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private void but_login_Click(object sender, EventArgs e)
  {
  string constring = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=E:\\³ÌÐòÁ·Ï°\\database\\data.accdb;Persist Security Info=False ";
  OdbcCommand comm = new OdbcCommand();
  OdbcConnection conn = new OdbcConnection();
  conn.ConnectionString = constring;
  comm.Connection = conn;
  conn.Open();
  comm.CommandText = "select * from user where user_name="+teb_username.Text +"and user_password="+teb_password.Text;
  OdbcDataReader reader = new OdbcDataReader();
  reader = comm.ExecuteReader();
  if (reader.HasRows)
.........
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---

Provider=Microsoft.Jet.OLEDB.4.0;Data Source=E:\½Ìѧ\HandsOn\DesignPattern\SimpleFactory\SF.mdb;User Id=admin;Password=;

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\\data.accdb

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ÔÚweb.config/app.configÖж¨Òå
<add key="DatabaseType" value="Oledb"/>
<add key="ConnectionString" value="provider=microsoft.jet.oledb.4.0;Data Source="/>