大家帮帮我改正下啊急用啊

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Data.SqlClient;
namespace 温州大学论文_选课_系统
{
    public partial class wsxk : Form
    {

        public wsxk()
        {
            InitializeComponent();
        }
         private SqlConnection MyCon, MyCon1;//连接对象
        private SqlDataAdapter MyDataAdapter, MyDataAdapter1, MyDataAdapter2;
        //数据适配器对象

        private DataSet MyDs, MyDs1, MyDs2;
        private BindingManagerBase Navigator;
        private string ClassID;
private string ClassName;
private DataTable table=new DataTable();
        private void DispValue()
        {
            MyCon1 = new SqlConnection(LoginForm.CString1);//创建连接对象
            MyCon1.Open();//打开连接
            string SqlStr1 = "select * from 学生网上选课 where 课题编号='"+textBox1.Text+"'"; //设置SQL命令字符串
            MyDataAdapter1 = new SqlDataAdapter(SqlStr1, MyCon1);//生成SqlDataAdapter对象
            MyDs1 = new DataSet();//产生数据集
            MyDataAdapter1.Fill(MyDs1, "student");//填充数据集

            string SqlStr2 = "select 课题编号,课程名称,指导老师,备注 from 学生网上选课 where 课题编号='"+textBox1.Text+"' ";
            MyDataAdapter2 = new SqlDataAdapter(SqlStr2, MyCon);//生成SqlDataAdapter对象
            MyDs2 = new DataSet();//产生数据集
            MyDataAdapter2.Fill(MyDs2, "xsxk");//填充数据集
            Navigator = this.BindingContext[MyDs2, "xsxk"];
            this.dataGrid2.DataSource = MyDs2;
            this.dataGrid2.DataMember = "xsxk";

        }

        private void button1_Click(object sender, EventArgs e)
        {
            bool f = false;
            string AddString;
            SqlCommand MyCom = new SqlCommand();
            MyCom.Connection = MyCon;
            MyCom.CommandType = CommandType.Text;
            if (textBox1.Text == "")
                MessageBox.Show("请输入要选课学生的学号！", "提示信息");
            else
            {

                    }

                if (f)
                    MessageBox.Show("该课程已经选上！");
                else
                {
                    AddString="insert into 网上选课表(课题编号,课题名称，指导老师，备注) values('"+textBox1.Text+"','"+textBox2.Text+"') UPDATE 网上选课教师=(select 教师 from 学生选课表 where 选课序号='"+textBox4.Text+"'),上课地点=(select 上课地点 from 学生选课表 where 选课序号='"+textBox4.Text+"'),上课时间=(select 上课时间 from 学生选课表 where 选课序号='"+textBox4.Text+"') where 选课序号='"+textBox4.Text+"'";
                    MyCom.CommandText = AddString;
                    MyCom.ExecuteNonQuery();
                    MyDataAdapter2.Update(MyDs2, "wsxk");
                    MyDs2.Clear();
                    MyDataAdapter2.Fill(MyDs2, "wsxk");
                }
            }

        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("确定要删除所选课程吗？", "询问", MessageBoxButtons.YesNo) == DialogResult.Yes)
            {
                try
                {
                    if (Navigator.Count > 0)
                    {
                        string strID = this.dataGrid2[this.dataGrid2.CurrentCell.RowNumber, 0].ToString().Trim();
                        string str = this.dataGrid2[this.dataGrid2.CurrentCell.RowNumber, 1].ToString().Trim();

                        SqlCommand comn = new SqlCommand(deleteID, MyCon);
                        comn.ExecuteNonQuery();
                        Navigator.RemoveAt(Navigator.Position);
                        try
                        {
                            this.MyDataAdapter2.Update(this.table);
                        }
                        catch (Exception express)
                        {
                            MessageBox.Show(express.ToString(), "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                            table.RejectChanges();
                        }
                    }





        private void button3_Click(object sender, EventArgs e)
        {
            string SeclectStr = "%";
            if (textBox1.Text.Trim() != "")
                SeclectStr = "select * 网上选课表 where 课题编号 like '" + textBox1.Text.Trim() + "%'";

            MyDataAdapter = new  SqlDataAdapter(SeclectStr, MyCon);
            MyDs.Clear();
            MyDataAdapter.Fill(MyDs, "Curricula");



        private void wsxk_Load(object sender, EventArgs e)
        {
            MyCon = new SqlConnection(LoginForm.CString1);//创建连接对象
            MyCon.Open();//打开连接
            string SqlStr1 = "select * from 学生网上选课";//设置SQL命令字符串
            MyDataAdapter = new SqlDataAdapter(SqlStr1, MyCon);//生成SqlDataAdapter对象
            MyDs = new DataSet();//产生数据集
            MyDataAdapter.Fill(MyDs, "Curricula");//填充数据集

            textBox1.DataBindings.Add("Text", MyDs, "Curricula.课程编号");
            textBox2.DataBindings.Add("Text", MyDs, "Curricula.课程名称");
            this.dataGrid1.DataSource = MyDs;
            this.dataGrid1.DataMember = "Curricula";
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void sqlConnection1_InfoMessage(object sender, SqlInfoMessageEventArgs e)
        {

        }
    }
}
调试说出现错误应输入 class、delegate、enum、inte易做图ce 或 struct 的错误请问高手门怎么改正啊？ --------------------编程问答-------------------- 没分！代码还这么长！
是哪里少了或者多了大括号了！自己找找吧！
你代码编写很不规范，不然就不会有这错误！

补充：.NET技术 ,  C#