winform+SQL 的超市管理

【实例简介】

超市管理系统，模拟其他实例制作，界面有点雷同，但是代码不一样。只要用于初学者掌握winform 的控件的应用，SQL的数据库操作

【实例截图】

【核心代码】

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.Threading.Tasks;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
using Wingtech.SuperMarket.BaseFunction;

namespace Wingtech.SuperMarket
{
    public partial class Login : Form
    {
        public Login()
        {
            InitializeComponent();
            btnCancel.Click  = BtnCancel_Click;
            btnOK.Click  = BtnOK_Click;
            this.Load  = Login_Load;
        }

        private void Login_Load(object sender, EventArgs e)
        {
            
        }

        private void BtnOK_Click(object sender, EventArgs e)
        {
            if (txtUserName.Text!="" && txtPwd.Text!="")
            {
                string sql ="select count(*) from tb_EmpInfo where EmpLoginName=@EmpLoginName and EmpLoginPwd=@EmpLoginPwd";
                if ((int)(SqlHelper.ExecuteScalar(SqlHelper.connectionString,CommandType.Text,sql, new SqlParameter[]
                {
                    new SqlParameter("@EmpLoginName",txtUserName.Text.Trim()),
                    new SqlParameter("@EmpLoginPwd",txtPwd.Text.Trim()) 
                }))==1)
                {
                    this.Hide();
                    Main main = new Main();
                    main.toolStripStatusUser.Text = txtUserName.Text;
                    main.EmpLoginName = txtUserName.Text.Trim();
                    main.Show();
                    
                }
                else
                {
                    MessageBox.Show("UserName or Pwd Error!");
                    return;
                }
            }
            else
            {
                MessageBox.Show("UserName or Pwd is Empoty!");
                return;
            }
        }

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