c# windows编程控件学习-1

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;

 namespace proj9_1
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         private void button1_Click(object sender, EventArgs e)
         {
             Form myform = new Form1_1();
             myform.ShowDialog();

         }

         private void Form1_Load(object sender, EventArgs e)
         {
             //MessageBox.Show("3个按钮", "信息提示", MessageBoxButtons.AbortRetryIgnore);
             listBox1.Items.Add("清华大学"); listBox1.Items.Add("北京大学");
             listBox1.Items.Add("北京航空航天大学"); listBox1.Items.Add("人民大学");
             listBox1.Items.Add("南京大学"); listBox1.Items.Add("武汉大学");
             listBox1.Items.Add("山东大学"); listBox1.Items.Add("复旦大学");
             enbutton();
         }

         private void enbutton()
         {
             if (listBox1.Items.Count == )
             {
                 button7.Enabled = false; button8.Enabled = false;
             }
             else
             {
                 button7.Enabled = true; button8.Enabled = true;
             }
             if (listBox2.Items.Count == )
             {
                 button9.Enabled = false; button10.Enabled = false;
             }
             else
             {
                 button9.Enabled = true; button10.Enabled = true;
             }
         }

         private void button2_Click(object sender, EventArgs e)
         {
             Form myform = new Form1_2();
             myform.Show();
         }

         private void richTextBox1_TextChanged(object sender, EventArgs e)
         {

         }

         private void groupBox1_Enter(object sender, EventArgs e)
         {

         }

         private void checkBox1_CheckedChanged(object sender, EventArgs e)
         {
             MessageBox.Show("3个按钮", "信息提示", MessageBoxButtons.AbortRetryIgnore);
         }

         private void button3_Click(object sender, EventArgs e)
         {
             if (checkBox1.Checked && checkBox3.Checked && !checkBox2.Checked && !checkBox4.Checked)
             {
                 MessageBox.Show("您答对了，真的很棒！！！", "信息提示", MessageBoxButtons.OK);
             }
             else
                 MessageBox.Show("您答错了，继续努力。", "信息提示", MessageBoxButtons.OK);
         }

         private void button4_Click(object sender, EventArgs e)
         {
             if (radioButton3.Checked)
             {
                 MessageBox.Show("您选对了", "提示", MessageBoxButtons.OK);
             }
             else if (radioButton1.Checked || radioButton4.Checked)
             {
                 MessageBox.Show("您选错了", "提示", MessageBoxButtons.OKCancel);
             }
             else
             {
                 MessageBox.Show("您选错了，这是数据库系统", "提示", MessageBoxButtons.OKCancel);
             }
         }

         private void button5_Click(object sender, EventArgs e)
         {
             pictureBox1.Image = Image.FromFile("E:\\flac3d.jpg");

         }

         private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
         {

         }

         private void button6_Click(object sender, EventArgs e)
         {
             if (textBox1.Text != "")
                 if (!comboBox1.Items.Contains(textBox1.Text))
                     comboBox1.Items.Add(textBox1);
         }

         private void button7_Click(object sender, EventArgs e)
         {
             if (listBox1.SelectedIndex >= )
             {
                 listBox2.Items.Add(listBox1.SelectedItem);
                 listBox1.Items.RemoveAt(listBox1.SelectedIndex);
             }
             enbutton();
         }
         private void button8_Click(object sender, EventArgs e)
         {
             foreach (var item in listBox1.Items)
             {
                 listBox2.Items.Add(item);
             }
             enbutton();
             listBox1.Items.Clear();
         }

     }
 }