CourseUI/MainForm.cs

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

namespace Course.UI
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
            this.skinEngine1.SkinFile = "PageColor2.ssk";
        }

        private void tsbtnCourseManager_Click(object sender, EventArgs e)
        {
            DisplayForm displayForm = new DisplayForm();
            if (DisplayForm.state)
            {
                DisplayForm.state = false;
                displayForm.MdiParent = this;
                displayForm.Show();

            }

        }

        private void tsbtnAddClass_Click(object sender, EventArgs e)
        {
            ClassForm classForm = new ClassForm();
            if (ClassForm.state)
            {
                ClassForm.state = false;
                ClassForm.objType = 0;
                classForm.MdiParent = this;
                classForm.Show();
            }

        }

        private void tsbtnClassInfoManager_Click(object sender, EventArgs e)
        {
            ClassInfo classInfo = new ClassInfo();
            if (ClassInfo.state)
            {
                ClassInfo.state = false;
                classInfo.MdiParent = this;
                classInfo.Show();
            }

        }

        private void tsbtnChapterSet_Click(object sender, EventArgs e)
        {
            ChapterSetForm chapterSet = new ChapterSetForm();