form4.cs

c# + sql2000 学生管理系统

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

namespace StudentManage.UILevel
{
    public partial class Form4 : Form
    {
        public Form4()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                SqlConnection sc = new SqlConnection("server=.;uid=sa;database=StudentManage");
                sc.Open();
                string sql = "insert into Score (Class,StudentID,Course)values('" + this.comboBox2.Text + "','" + this.textBox2.Text + "','" + this.comboBox3.Text + "')";
                SqlCommand scom = new SqlCommand(sql, sc);
                if (this.comboBox2.Text != "" && this.textBox2.Text != "" && this.comboBox3.Text != "")
                {
                    scom.ExecuteNonQuery();
                    MessageBox.Show("添加成功！");
                }
                else MessageBox.Show("添加失败！");
                sc.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            } 
        }

        private void label3_Click(object sender, EventArgs e)
        {

        }

        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void textBox4_TextChanged(object sender, EventArgs e)
        {

        }

        private void button3_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                SqlConnection sc = new SqlConnection("server=.;uid=sa;database=StudentManage");
                sc.Open();
                string sql = "delete from Score  where Class='" + this.comboBox2.Text + "'and StudentID='" + this.textBox2.Text + "'and Course='" + this.comboBox3.Text + "'";
                SqlCommand scom = new SqlCommand(sql, sc);
                if (this.comboBox2.Text != "" && this.textBox2.Text != "" && this.comboBox3.Text != "")
                {
                    scom.ExecuteNonQuery();
                    MessageBox.Show("删除成功！");
                }
                else MessageBox.Show("删除失败！");
                sc.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show("ex.Message");
            } 
        }

      
        }
    }