常用控件

标签，文本，按钮，列表框，组合框等的使用

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace 学生成绩管理系统
{
    internal static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new FormWelcome());
        }
    }
}

FormWelcome.cs

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 学生成绩管理系统
{
    public partial class FormWelcome : Form
    {
        public FormWelcome()
        {
            InitializeComponent();
        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            linkLabel1.LinkVisited = true;
            FormLogin loginForm = new FormLogin();
            loginForm.Show();
            this.Hide();
        }

        private void linkLabel2_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            labelWelcome.Visible = true;
            // labelWelcome.Show();
        }

        private void linkLabel3_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            labelWelcome.Visible = false;
            // labelWelcome.Hide();
        }

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

FormLogin.cs

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 学生成绩管理系统
{
    public partial class FormLogin : Form
    {
        public FormLogin()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBoxUserName.Text == string.Empty || textBoxPassWord.Text == string.Empty)
            {
                MessageBox.Show("信息禁止为空！", "登录提示");
                textBoxUserName.Clear();
                textBoxPassWord.Clear();
                textBoxPassWord.Focus();
                return;
            }
            if (!textBoxUserName.Text.Equals("admin") || !textBoxPassWord.Text.Equals("admin"))
            {
                MessageBox.Show("用户名或密码错误!", "登录提示");
                textBoxUserName.Clear();
                textBoxPassWord.Clear();
                textBoxPassWord.Focus();
                return;
            }
            else {
                MessageBox.Show("欢迎您登录本系统!", "消息提示");

                FormMenu formMenu = new FormMenu();
                formMenu.Show(this);

                textBoxUserName.Clear();
                textBoxPassWord.Clear();
                textBoxPassWord.Focus();
                //groupBox1.Hide();
                this.Hide();             
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBoxUserName.Clear();
            textBoxPassWord.Clear();
            textBoxPassWord.Focus();
        }

        private void FormLogin_Load(object sender, EventArgs e)
        {

        }
    }
}

FormMenu.cs

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 学生成绩管理系统
{
    public partial class FormMenu : Form
    {
        public FormMenu()
        {
            InitializeComponent();
        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            MessageBox.Show("您选择的部门是:" + listBox1.SelectedItem.ToString() +
                ",位列第" + listBox1.SelectedIndex.ToString(), "提示信息");
        }


        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            MessageBox.Show("已选择：" + comboBox1.SelectedItem.ToString() + "， 位列："
                + comboBox1.SelectedIndex.ToString(), "提示信息");
        }

        private void FormMenu_Load(object sender, EventArgs e)
        {
            this.listBox1.Items.Add("软件部");
            this.listBox1.Items.Add("硬件部");
            this.listBox1.Items.Add("财务部");
            this.listBox1.Items.Add("人事部");

            this.comboBox1.Items.Add("产品部");
            this.comboBox1.Items.Add("销售部");
            this.comboBox1.Items.Add("生产部");
            //this.comboBox1.SelectedIndex = 0;
        }

    }
}

程序运行效果：