public partial class Form1 : Form {         public Form1()         {             InitializeComponent();         }                  int num = 1;   //定义num是为了获取输入错误的次数           private void btnregster_Click(object sender, EventArgs e)         {             //如果达到三次则注册按钮将不能使用             if (num == 3)             {                 this.btnregster.Enabled = false;             }             //定义字符串来接收文本数据             string user = this.txtname.Text.Trim();             string pwd = this.txtpwd.Text.Trim();              string email = this.txtemail.Text.Trim();             string phone = this.txtphone.Text.Trim();     //判断用户名、密码、邮箱、手机、性别、爱好是否为空，如果为空，则提示注册失败，否则则提示注册成功，进入下一个界面                 if (string.IsNullOrEmpty(user))                 {                     MessageBox.Show("注册失败，未输入用户名！");                     ++num; //计时器的累加                 }                   else if (string.IsNullOrEmpty(pwd))                 {                     MessageBox.Show("注册失败，未输入密码！");                     ++num;                 }                  else if (txtaginpwd.Text != pwd)                 {                     MessageBox.Show("注册失败，确认密码必须保持一致");                     ++num;                 }                   else if (string.IsNullOrEmpty(email))                 {                     MessageBox.Show("注册失败，未输入邮箱");                     ++num;                 }                   else if (string.IsNullOrEmpty(phone))                 {                     MessageBox.Show("注册失败，未输入手机号");                     ++num;                 }                   else if (cbkbasketball.Checked==false && cbkpaiqiu.Checked==false && cbkscore.Checked==false)//只有在都没有被选中的情况下才显示注册失败                 {                     MessageBox.Show("注册失败，请选择爱好！");                     ++num;                 }                 else if (radman.Checked==false && radwomen.Checked==false  )                 {                     MessageBox.Show("注册失败，请选择性别");                      ++num;                 }                else               {                    MessageBox.Show("注册成功");                    Form2 fm = new Form2(user);//打开Form2的窗体，这里传入一个参数user。                    fm.Show();                    this.Hide();    //隐藏Form1的窗体               }            //创建一个Regster文本文档，并写入注册信息，且以分隔符（|）隔开                 string gender = string.Empty;                 string like = string.Empty;               //判断性别被选中的是哪个，就获取哪个的文本                 if (radman.Checked == true)                 {                     gender = radman.Text;                 }                 else                 {                     gender = radwomen.Text;                 }               //判断爱好哪几个被选中，则获取选中的文本                                  if (this.cbkbasketball.Checked)                 {                     like += cbkbasketball.Text + ",";                 }                 if (this.cbkpaiqiu.Checked)                 {                     like += cbkpaiqiu.Text+",";                                    }                 if (this.cbkscore.Checked)                 {                     like += cbkscore.Text+",";                 }                 string[] array = { txtname.Text, txtpwd.Text, txtemail.Text, txtphone.Text, gender,like };//定义一个数组来接收注册信息的数据                 string strs = string.Empty;                 foreach (var item in array)                {                     strs += item;                     strs = string.Join("|",array);//注册信息在文本文档中以分隔符隔开            }                 File.WriteAllText("Regster.txt", strs);//若只写文档名字，则默认的路径是在本项目的bin目录下。          }             private void btnconsole_Click(object sender, EventArgs e)//取消按钮       {             txtname.Focus();//让用户名重新获取焦点             txtname.Text = "";             txtpwd.Text = "";             txtaginpwd.Text = "";             txtemail.Text = "";             txtphone.Text = "";             radman.Checked = false;             radwomen.Checked = false;             cbkbasketball.Checked = false;             cbkpaiqiu.Checked = false;             cbkscore.Checked = false;         }           private void timer1_Tick(object sender, EventArgs e)         {              //输入三次错误后，计时器停止输入3分钟后再重新输入                 this.btnregster.Enabled = true;         }           private void Form1_Activated(object sender, EventArgs e)        {             txtname.Focus();//首先让用户名文本框获得焦点 }