C#窗体实现点餐系统

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace 点餐管理系统
{
    public partial class FormMain : Form
    {
        public string constr = ConfigurationManager.ConnectionStrings["sqlserver"].ConnectionString;
        public  string UserId = "";
        public FormMain()
        {
            InitializeComponent();
        }
      
        private void 用户列表ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            FormUserInfo frm = new FormUserInfo();
            frm.MdiParent = this;
            frm.StartPosition = FormStartPosition.CenterScreen;
            frm.constr = constr;
            frm.UserName = UserId;
            frm.Show();
        }
 
        private void 密码修改ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ChangePassword frm = new ChangePassword(UserId);
            frm.MdiParent = this;
            frm.StartPosition = FormStartPosition.CenterScreen;
            frm.constr = constr;
            frm.Show();
        }
 
        private void 菜单信息ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            FormRoomInfo frm = new FormRoomInfo();
            frm.MdiParent = this;
            frm.StartPosition = FormStartPosition.CenterScreen;
            frm.constr = constr;
            frm.UserName = UserId;
            frm.Show();
        }
 
        private void 点餐管理ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            FormCustomerInfo frm = new FormCustomerInfo();
            frm.MdiParent = this;
            frm.StartPosition = FormStartPosition.CenterScreen;
            frm.constr = constr;
            frm.UserName = UserId;
            frm.Show();
        }
 
        private void 关于系统ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            FormAbout frm = new FormAbout();
            frm.MdiParent = this;
            frm.StartPosition = FormStartPosition.CenterScreen;
            frm.Show();
        }
 
        private void FormMain_FormClosing(object sender, FormClosingEventArgs e)
        {
            Application.Exit();
        }
    }
}