adapter.SelectCommand = new SqlCommand(strSql,conn);

        // Build the DataSet
        DataSet ds = new DataSet();

        adapter.Fill(ds, employees);

        // Get a FileStream object
        FileStream fs = new FileStream(strFileName,FileMode.OpenOrCreate,FileAccess.Write);

        // Apply the WriteXml method to write an XML document
        ds.WriteXml(fs);

        fs.Close();

    }
}
十一、用ADO添加数据到数据库中：
using System;
using System.Data;  
using System.Data.OleDb;  

class TestADO
{ 
    static void Main(string[] args) 
    { 
        string strDSN = Provider=Microsoft.Jet.OLEDB.4.0;DataSource=c:\test.mdb; 
        string strSQL = INSERT INTO Employee(FirstName, LastName) VALUES('FirstName', 'LastName') ; 
                  
        // create Objects of ADOConnection and ADOCommand  
        OleDbConnection conn = new OleDbConnection(strDSN); 
        OleDbCommand cmd = new OleDbCommand( strSQL, conn ); 
        try 
        { 
            conn.Open(); 
            cmd.ExecuteNonQuery(); 
        } 
        catch (Exception e) 
        { 
            Console.WriteLine(Oooops. I did it again:\n{0}, e.Message); 
        } 
        finally 
        { 
            conn.Close(); 
        }         
    }
} 
十二、使用OLEConn连接数据库：
using System;
using System.Data;  
using System.Data.OleDb;  

class TestADO
{ 
    static void Main(string[] args) 
    { 
        string strDSN = Provider=Microsoft.Jet.OLEDB.4.0;DataSource=c:\test.mdb; 
        string strSQL = SELECT * FROM employee ;