帮忙理解下

Question

  public partial class formMain : Form
    {
        public bool modifi = false;
        public string myname;
        SqlDataAdapter adapter, adapter1, adapter2;
        DataSet ds, ds1, ds2;
        public formMain()
        {
            InitializeComponent();
            string str = @"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Documents and Settings\Administrator\桌面\学生信息管理系统\WindowsApplication3\DATA\maojin.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
            SqlConnection con = new SqlConnection(str);
            string sqlstr = "select * from 学生表";
            adapter = new SqlDataAdapter(sqlstr, con);
            SqlCommandBuilder builder = new SqlCommandBuilder(adapter);
            adapter.InsertCommand = builder.GetInsertCommand();
            adapter.UpdateCommand = builder.GetUpdateCommand();
            ds = new DataSet();
            adapter.Fill(ds, "学生表");
            this.dataGrid1.DataSource = ds.Tables["学生表"];            sqlstr = "select * from 课程表";
            adapter1 = new SqlDataAdapter(sqlstr, con);
            SqlCommandBuilder builder1 = new SqlCommandBuilder(adapter1);
            adapter1.InsertCommand = builder1.GetInsertCommand();
            adapter1.DeleteCommand = builder1.GetDeleteCommand();
            adapter1.UpdateCommand = builder1.GetUpdateCommand();
            ds1 = new DataSet();
            adapter1.Fill(ds1, "课程表");
            this.dataGrid2.DataSource = ds1.Tables["课程表"];            sqlstr = "select * from 选课表";
            adapter2 = new SqlDataAdapter(sqlstr, con);
            SqlCommandBuilder builder2 = new SqlCommandBuilder(adapter2);
            adapter2.InsertCommand = builder2.GetInsertCommand();
            adapter2.DeleteCommand = builder2.GetDeleteCommand();
            adapter2.UpdateCommand = builder2.GetUpdateCommand();
            ds2 = new DataSet();
            adapter2.Fill(ds2, "选课表");
            this.dataGrid3.DataSource = ds2.Tables["选课表"];
            con.Close();
        }        
        private void formMain_FormClosing_1(object sender, FormClosingEventArgs e)
        {
           
            Application.Exit();
        }        private void AddInf_Click_1(object sender, EventArgs e)
        {
            AddStudent adst = new AddStudent();            adst.Show();
        }        private void AddCourse_Click(object sender, EventArgs e)
        {            formAdC adco = new formAdC();
           
            adco.Show();
        }
        private void button1_Click_1(object sender, EventArgs e)
        {
            string str = @"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Documents and Settings\Administrator\桌面\学生信息管理系统\WindowsApplication3\DATA\maojin.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
            SqlConnection con = new SqlConnection(str);
            string sqlstr = "select * from 学生表";
            adapter = new SqlDataAdapter(sqlstr, con);
            SqlCommandBuilder builder = new SqlCommandBuilder(adapter);
                adapter.InsertCommand = builder.GetInsertCommand();
                adapter.DeleteCommand = builder.GetDeleteCommand();
                adapter.UpdateCommand = builder.GetUpdateCommand();
            ds = new DataSet();
            adapter.Fill(ds, "学生表");
            this.dataGrid1.DataSource = ds.Tables["学生表"];             sqlstr = "select * from 课程表";
            adapter1 = new SqlDataAdapter(sqlstr, con);
            SqlCommandBuilder builder1 = new SqlCommandBuilder(adapter1);
            adapter1.InsertCommand = builder1.GetInsertCommand();
            adapter1.DeleteCommand = builder1.GetDeleteCommand();
            adapter1.UpdateCommand = builder1.GetUpdateCommand();
            ds1 = new DataSet();
            adapter1.Fill(ds1, "课程表");
            this.dataGrid2.DataSource = ds1.Tables["课程表"];            sqlstr = "select * from 选课表";
            adapter2 = new SqlDataAdapter(sqlstr, con);
            SqlCommandBuilder builder2 = new SqlCommandBuilder(adapter2);
            adapter2.InsertCommand = builder2.GetInsertCommand();
            adapter2.DeleteCommand = builder2.GetDeleteCommand();
            adapter2.UpdateCommand = builder2.GetUpdateCommand();
            ds2 = new DataSet();
            adapter2.Fill(ds2, "选课表");
            this.dataGrid3.DataSource = ds2.Tables["选课表"];
            con.Close();
  
        }
主要意思是什么？adpater怎么使用的？

Answer 1

相关的看MSDN
获取课程表，学生表，选课表数据

Answer 2

主要意思是什么？最基本的数据库读写
添加课程
添加信息
课程表
选课表adpater怎么使用的？你的代码就是这个问题的答案。