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   源码介绍

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用户名密码存储到变量中了，属于新手入门级别的示例

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace 登录窗口3._19
{
    public partial class Form1 : Form
    {
        int number=0;
        int maxnumber=3;

        public Form1() 
        {
            InitializeComponent();

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {
            
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            
           
        }

        private void button1_Click(object sender, EventArgs e)
        {
            String[] nameArry={"zs","ls","ww"};
            String[] passArry = { "zs123", "ls123", "ww123" };
            String name = textBox1.Text;
            String password = textBox2.Text;
            for (int i = 0; i < nameArry.Length; i  )
            {
                if (textBox1.Text == nameArry[i] && textBox2.Text == passArry[i])
                {
                    Form2 f2 = new Form2();
                    f2.Show(); 
                    this.Hide();
                    break;
                }

                else if (name == "")
                {
                    MessageBox.Show("请输入用户名", "登陆失败");
                    number  ; break;

                }
                else if (password == "")
                {
                    MessageBox.Show("请输入密码", "登陆失败");
                    number  ; break;

                }

                else if(textBox1.Text==nameArry[i]&&textBox2.Text!=passArry[i])
                {
                    
                    MessageBox.Show("用户名或密码不匹配！");
                    number  ; break;
                }
            }
            if (number == maxnumber)
            {
                MessageBox.Show("错误次数过多！");
                Application.Exit();
            }
        }

        private void label1_Click(object sender, EventArgs e)
        {

        }
    }
}