航空购票项目

第一步窗口搭建：

2.第二步利用 DataSet实现下拉框：

 private void Form1_Load(object sender, EventArgs e)
        {
            dataGridView1.AutoGenerateColumns = false;

            string Str = "Data Source=.;Initial Catalog=Ticket;User ID=sa;Password=2537924321";
            string sql = "select Id,CityName from CityInfo";
            SqlConnection conn = new SqlConnection(Str);
            SqlCommand hua = new SqlCommand(sql, conn);
            SqlDataAdapter da = new SqlDataAdapter();
            da.SelectCommand = hua;
            DataSet ds = new DataSet();

            da.Fill(ds, "stu");
            DataRow rows = ds.Tables["stu"].NewRow();
            rows["Id"] = -1;
            rows["CityName"] = "请选择";

            ds.Tables["stu"].Rows.InsertAt(rows, 0);
            comboBox1.DataSource = ds.Tables["stu"];
            comboBox1.DisplayMember = "CityName";
            comboBox1.ValueMember = "Id";

          //  DataSet ds1 = new DataSet();

            da.Fill(ds, "stu1");
            DataRow row = ds.Tables["stu1"].NewRow();
            row["Id"] = -1;
            row["CityName"] = "请选择";

            ds.Tables["stu1"].Rows.InsertAt(row, 0);
            comboBox2.DataSource = ds.Tables["stu1"];
            comboBox2.DisplayMember = "CityName";
            comboBox2.ValueMember = "Id";

    

         }

实现功能如下：

第三步 DataSet实现查找的功能并利用dataGridView属性来相互对其：

   private void button1_Click(object sender, EventArgs e)
        {
            string Str = "Data Source=.;Initial Catalog=Ticket;User ID=sa;Password=2537924321";
            string begin = comboBox1.SelectedIndex.ToString();
            string end = comboBox2.SelectedIndex.ToString();
            string sql ="select * from AirwaysInfo ,FlightInfo where AirwaysInfo.Id = FlightInfo.AirwaysId and LeaveCity = '"+begin+"' and Destination = '"+end+"'";
            SqlConnection conn = new SqlConnection(Str);

            SqlDataAdapter sa = new SqlDataAdapter(sql, conn);
            DataSet ds = new DataSet();
            ds.Tables.Clear();
            sa.Fill(ds, "s");
            dataGridView1.DataSource = ds.Tables["s"];

第四步利用文本特性实现与介绍框对应：

   private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            textBox1.Text = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
            textBox5.Text = dataGridView1.SelectedRows[0].Cells[1].Value.ToString();
            textBox3.Text = dataGridView1.SelectedRows[0].Cells[2].Value.ToString();
            textBox7.Text = dataGridView1.SelectedRows[0].Cells[3].Value.ToString();
            textBox4.Text = dataGridView1.SelectedRows[0].Cells[4].Value.ToString();
            textBox2.Text = comboBox1.Text;
            textBox6.Text = comboBox2.Text;
           
           

        }

5.第五步实现预定和取消  并设以随机数链接数据库   利用if给日期设必须是未来的条件  加上非空验证：

 private void button2_Click(object sender, EventArgs e)
        {
            string Str = "Data Source=.;Initial Catalog=Ticket;User ID=sa;Password=2537924321";
            SqlConnection conn = new SqlConnection(Str);
            Random r = new Random();
            String random = Convert.ToString(r.Next(100000,1000000));
            string flightNo = textBox1.Text;
            if (Convert.ToDateTime(dateTimePicker2.Text) < Convert.ToDateTime(DateTime.Now.ToString()))
            {
                MessageBox.Show("请检查信息！");
            }
            else
            {
                DateTime time = dateTimePicker2.Value;
                int num =Convert.ToInt32(numericUpDown1.Text);
                conn.Open();
                string sql = "insert into OrderInfo values('"+random+"','"+flightNo+"','"+time+"','"+num+"')";
                SqlCommand comm = new SqlCommand(sql,conn);
                int no = comm.ExecuteNonQuery();
                if (no > 0)
                {
                    DialogResult cui = MessageBox.Show("确定预定吗", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
                    if (cui == DialogResult.Yes)
                    {
                        MessageBox.Show("预定成功");

                    }
                }
                else
                {
                    MessageBox.Show("请检查信息！");
                }
                conn.Close();
            }
        }