零件交易系统

实现了交易的各种情况，一方发出订单，一方接受订单，一方取消订单，合同终止。

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 System.Configuration;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1（）
        {
            InitializeComponent（）;
        }

        private void button4_Click（object sender EventArgs e）
        {

        }

        private void button3_Click（object sender EventArgs e）//跳转到另外的窗口
        {
            //Form2 form2 = new Form2（）;
            //form2.TopLevel = false; // 这一步最重要 去除子窗体的顶级窗体设置
            //form2.Parent = this.panel1; // 子窗体的父容器
            //form2.FormBorderstyle = FormBorderstyle.None; // 去边框标题栏等
            //form2.Dock = Dockstyle.Fill; // 填充
            //form2.Show（）;


            Form2 frm2 = new Form2（）;
            //  this.Hide（）;
            if （frm2.ShowDialog（） == DialogResult.OK）
            {
                this.Show（）;
            }
        }

        private void button4_Click_1（object sender EventArgs e）//取消登陆界面
        {
            this.Close（）;
        }

        private void button1_Click（object sender EventArgs e）//登录按钮，检验并连接数据库匹配帐号
        {
            if （textBox1 .Text .Trim （）!=““ &&textBox2 .Text .Trim （）!=““ ）
            {
                string sqlconnstr = ConfigurationManager.ConnectionStrings[“ConnectionString“].ToString（）;
                SqlConnection cn = new SqlConnection（sqlconnstr）;
                SqlCommand cmd = new SqlCommand（）;
                cmd.Connection = cn;
                cn.Open（）;
             if （radioButton1.Checked ）
             {
                cmd.CommandText = “select * from customer where c_no=@no and c_pw=@pw“;
                cmd.Parameters.AddWithValue（“@no“ textBox1.Text.Trim（））;
                cmd.Parameters.AddWithValue（“@pw“ textBox2.Text.Trim（））;
                SqlDataReader sdr = cmd.ExecuteReader（）;
                int t = 0;
                while （sdr.Read（））
                {
                    t++;
                }
                if （t > 0）
                {
               //     MessageBox.Show（“找到该用户“）;
                    cmd = null;
                    cn.Close（）;
                    cn = null;
                    yhForm frm = new yhForm（textBox1.Text.Trim（））;
                    this.Hide（）;
                    if （frm.ShowDialog（） == DialogResult.OK）
                    {
                        this.Show（）;
                    }

                }
                else
                {
                    MessageBox.Show（“用户名或密码错误，请重新输入“）;

                }
            }////////////////////////////////if
             else   if （radioButton2.Checked）
             {
                 cmd.CommandText = “select * from gys where g_no=@no and g_pw=@pw“;
                 cmd.Paramet

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2012-06-25 16:27  软工2012-6-25\
     目录           0  2012-06-14 14:54  软工2012-6-25\WindowsFormsApplication1\
     目录           0  2012-06-14 14:54  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\
     文件         962  2012-05-25 06:24  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1.sln
     文件       54272  2012-06-21 00:36  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1.suo
     文件        1048  2012-06-11 10:34  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\App.config
     目录           0  2012-06-14 14:54  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\bin\
     目录           0  2012-06-14 14:54  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\
     文件     2293760  2012-06-11 11:07  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\MyDatabase.mdf
     文件      573440  2012-06-11 11:07  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\MyDatabase_log.ldf
     文件      333824  2012-06-11 11:04  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe
     文件        1048  2012-06-11 10:34  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe.config
     文件      820736  2012-06-11 11:04  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.pdb
     文件       11592  2012-06-20 22:09  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe
     文件        1048  2012-06-11 10:34  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe.config
     文件         490  2007-07-21 01:33  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe.manifest
     文件        6083  2012-06-05 09:13  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs
     文件        8589  2012-06-05 09:13  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\Form1.Designer.cs
     文件        5814  2012-06-05 09:13  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\Form1.resx
     文件        6174  2012-06-11 10:35  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\Form2.cs
     文件       11231  2012-05-29 12:59  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\Form2.Designer.cs
     文件        5814  2012-05-29 12:59  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\Form2.resx
     文件        8949  2012-06-05 08:59  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\Form3.cs
     文件       12431  2012-06-05 08:59  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\Form3.Designer.cs
     文件        8354  2012-06-05 08:59  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\Form3.resx
     文件       13604  2012-06-11 12:49  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\gysForm.cs
     文件       20551  2012-06-11 12:49  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\gysForm.Designer.cs
     文件        7103  2012-06-11 12:49  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\gysForm.resx
     文件        4018  2012-06-11 11:04  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\gysxgForm.cs
     文件       10423  2012-06-05 08:41  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\gysxgForm.Designer.cs
     文件        5814  2012-06-05 08:41  软工2012-6-25\WindowsFormsApplication1\WindowsFormsApplication1\gysxgForm.resx
............此处省略47个文件信息