scholastic/Form6_4.cs

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

namespace scholastic
{
    public partial class Form6_4 : Form
    {
        SqlConnection mycon ;
        public Form6_4()
        {
            InitializeComponent();
        }

        private void groupBox2_Enter(object sender, EventArgs e)
        {

        }

        private void Form6_4_Load(object sender, EventArgs e)
        {
            string constr = "server=.\\sql2005;database=mydata;uid=sa;pwd=sa";
            mycon = new SqlConnection(constr);
            mycon.Open();
            SqlCommand mycom = new SqlCommand("select distinct(专业) from class", mycon);
            SqlDataReader myread = mycom.ExecuteReader();   //定义SqlDataReader对象并读取数据信息
            comboBox1.Items.Clear();   //清空comBox1的数据项
            while (myread.Read())
            {
                comboBox1.Items.Add(myread[0].ToString());    
            }
            myread.Close();
            myread.Dispose();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (comboBox1.Text == "")
            {
                MessageBox.Show(this, "专业不能为空，请选择班级！", "提示对话框", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
            else
            {
                string SqlStr = "select * from class where 专业='" + comboBox1.SelectedItem.ToString() + "'";
                SqlDataAdapter ada = new SqlDataAdapter(SqlStr, mycon);
                DataSet ds = new DataSet();
                ada.Fill(ds);    //连接数据表格，显示数据
                this.dataGridView1.DataSource = ds.Tables[0].DefaultView;
            }
        }

        private void Form6_4_FormClosing(object sender, FormClosingEventArgs e)
        {
            this.DialogResult = DialogResult.OK;