private void UseManaw_Load(object sender, EventArgs e)
        {
            OleDbConnection myconnection = conn.con();
            string strInsert = "select * from 用户";
            OleDbDataAdapter oda = new OleDbDataAdapter(strInsert,myconnection);
            DataSet ds = new DataSet();
            oda.Fill(ds);
            usename1.Text = ds.Tables[0].Rows[0][1].ToString();
            passwordl.Text = ds.Tables[0].Rows[0][2].ToString();


        }//获取用户名和密码。  
private void UseManab_Click(object sender, EventArgs e)
        {
            OleDbConnection myconnection = conn.con();
            string strInsert = "select * from 用户";
            OleDbDataAdapter oda = new OleDbDataAdapter(strInsert, myconnection);
            OleDbCommandBuilder cb = new OleDbCommandBuilder(ada); 
            DataSet ds = new DataSet();
            oda.Fill(ds);
。。。修改后如何更新。
        }
菜鸟这里先谢了！