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OleDbConnection conn=null;
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=数据库名;Jet OLEDB:Database Password=";
conn = new OleDbConnection(str);
string sql = "这里面是SQL语句";
DataSet myds = new DataSet();
OleDbDataAdapter da = new OleDbDataAdapter(sql, conn);
da.Fill(myds);
string sql = "这里面是SQL语句";
OleDbCommand com = new OleDbCommand(sql, conn);
com.ExecuteNonQuery();
OleDbConnection conn = new OleDbConnection();
conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\\Database\\booksell.mdb";
conn.Open();