LinQ to SQL 增，删，改 代码演示

NorthwindDBDataContext dc = new NorthwindDBDataContext();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack)
            return;
        Bind();
    }
    /// <summary>
    /// 绑定数据
    /// </summary>
    private void Bind()
    {
        GridView1.DataSource = dc.Users;
        GridView1.DataBind();
    }
    /// <summary>
    /// 添加
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void Button1_Click(object sender, EventArgs e)
    {
        //把需要的值存起来
        string name = TextBox1.Text;
        string pass = TextBox2.Text;
        bool sex = CheckBox1.Checked;
        Users user = new Users() { UserName = name, UserPwd = pass, Sex = sex }; //初始化一个用户类
        dc.Users.InsertOnSubmit(user); //提交数据
        //List<Users> list = new List<Users>() { user };//生成一个用户集合
        //dc.Users.InsertAllOnSubmit(list);    //提交数据
        dc.SubmitChanges();  //对数据库进行修改
        Bind();
    }
    /// <summary>
    /// 删除
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        //把需要删除的ID找到
        string id = GridView1.DataKeys[e.RowIndex].Value.ToString(); //ID进行过绑定
       ① var result = from u in dc.Users
                     where u.ID.ToString() == id
                     select u;    //把需要删除的行先找出来 
        dc.Users.DeleteAllOnSubmit(result);   //删除多行     result 就是一个集合
        //dc.Users.DeleteOnSubmit(result.First());   删除单行
        dc.SubmitChanges();  //跟新数据库
        Bind();
    } 
     ①=var result = dc.Users.Where((x) => x.ID.ToString() == id);  //相当于LINQ语句查询  确定是那张表where里面接Lambda表达式

 修改一般都是拿到数据到别的页面进行修改，然后再提交到数据库   更新超链接定位此网页   tt.aspx?id={0} 把ID传过来

 NorthwindDBDataContext dc = new NorthwindDBDataContext();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack)
            return;
        string id = Request.QueryString["id"].ToString();   //拿到需要修改行的ID      
        Users user = dc.Users.Where((x) => x.ID.ToString() == id).First();   //拿到需要修改的那行数据
        TextBox1.Text = user.UserName;
        TextBox2.Text = user.UserPwd;
        CheckBox1.Checked = user.Sex;
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string id = Request.QueryString["id"].ToString();
        Users user = dc.Users.Where((x) => x.ID.ToString() == id).First(); //找到需要修改行，进行修改
        user.UserName = TextBox1.Text;
        user.UserPwd = TextBox2.Text;
        user.Sex = CheckBox1.Checked;
        dc.SubmitChanges();
        Response.Redirect("test.aspx");   //再回原来的页面
    }