学生成绩管理系统/frmStudent/frmStudentAdd.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data .SqlClient ;
using Model;
using BLL;

namespace 学生成绩管理系统.frmStudent
{
    public partial class frmStudentAdd : Form
    {
        private DataTable dtstudent;
        public frmStudentAdd()
        {
            InitializeComponent();
        }
         public frmStudentAdd(DataTable dtstudent)
        {
             this.dtstudent=dtstudent ;
            InitializeComponent();
        }
        private void frmStudentAdd_Load(object sender, EventArgs e)
        {
            //民族
            StuBLL stubll = new StuBLL();
            DataTable dtnation = stubll.GetNation();
            cobNation.DataSource = stubll.GetNation();
            cobNation.DisplayMember = "nationnal";


            //系别
            DeptBLL deptBll = new DeptBLL();
            DataTable dtdept = deptBll.getDept();
            cobDept.DataSource = deptBll.getDept();
            cobDept.DisplayMember = "cdeptname";
            cobDept.ValueMember = "cdeptno";

            //StuBLL stubll = new StuBLL();
            dtstudent = stubll.GetStu();
            //dgvstu.DataSource = dtstudent;
            //设置主键
            DataColumn[] dc = { dtstudent.Columns["sno"] };
            dtstudent.PrimaryKey = dc;

        }

        private void cobDept_SelectedIndexChanged(object sender, EventArgs e)
        {
            ClassBLL classBll = new ClassBLL();
            string cdeptno = cobDept.SelectedValue.ToString();
            DataTable dtclass = classBll.GetClass(cdeptno);
            cobClass.DataSource = classBll.GetClass(cdeptno);
            cobClass.DisplayMember = "cname";
            cobClass.ValueMember = "cno";