4.第二章.上机1-3

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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.Threading.Tasks;using System.Windows.Forms;namespace WindowsFormsApplication2{    public partial class MySchool : Form    {        public MySchool()        {            InitializeComponent();        }        private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)        {            MySchool_管理员 x = new MySchool_管理员();            x.Show();        }    }}
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace WindowsFormsApplication2{    public partial class MySchool_管理员 : Form    {        public MySchool_管理员()        {            InitializeComponent();        }        private void MySchool_管理员_Load(object sender, EventArgs e)        {                    }        private void 编辑学生信息ToolStripMenuItem_Click(object sender, EventArgs e)        {MySchool_编辑学生信息 z = new MySchool_编辑学生信息();            z.MdiParent = this;            z.Show();        }    }}


using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;using System.Data.SqlClient;namespace WindowsFormsApplication2{    public partial class MySchool_编辑学生信息 : Form    {        public MySchool_编辑学生信息()        {            InitializeComponent();        }        public bool BG() {            DBHelper awe = new DBHelper();            try            {                string sql = "SELECT * FROM [Grade]";                awe.OpenConnection();                SqlCommand command = new SqlCommand(sql, awe.Connection);                SqlDataReader myReader = command.ExecuteReader();                while (myReader.Read())                {                    string gradeName = myReader["GradeName"].ToString();                    comboBox1.Items.Add(gradeName);                }                myReader.Close();                return true;            }            catch (Exception)            {                MessageBox.Show("系统发生错误", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);                return false;            }            finally {                awe.CloseConnection();            }                }        private void MySchool_编辑学生信息_Load(object sender, EventArgs e)        {            BG();        }



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