winform小练习

   private void button1_Click(object sender, EventArgs e)
        {
            string str = textBox1.Text;
            char first = str[0];
            string second = str.Substring(1);
            textBox1.Text = second + first;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            string str = textBox1.Text;
            string first = str.Substring(str.Length-1);
            string second = str.Substring(0, str.Length - first.Length);
            textBox1.Text = first + second;
        }

 

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //private int remeber;
        //public int Remeber
        //{
        //    get;
        //    set;
        //}
        private int remeber = 0;
        private void button1_Click(object sender, EventArgs e)
        {
            string name = this.textBox1.Text;
            string pwd = this.textBox2.Text;
            if (name == "admin" && pwd == "888888")
            {
                MessageBox.Show("登录成功");
            }
            else
            {
                remeber++;//局部变量每次运行完毕都会销毁，下次再运行，会重新初始化，而类字段，只要对象不销毁，就会一直保持对象的字段值。
                if (remeber >= 3)
                {
                    MessageBox.Show("已经超过3次,登录失败。");
                    Application.Exit();
                }
                MessageBox.Show("登录失败");
            }
        }
        private void button2_Click(object sender, EventArgs e)
        {
            string old = this.textBox3.Text;
            string newpwd = this.textBox4.Text;
            string newpwd2 = this.textBox5.Text;
            if (old == newpwd)
            {
                MessageBox.Show("修改后的密码不能和旧密码相同");
                return;
            }
            else if (newpwd != newpwd2)
            {
                MessageBox.Show("密码修改不一致");
                return;
            }
            else
            {
                MessageBox.Show("密码修改成功");
            }
        }
        private void button3_Click(object sender, EventArgs e)
        {
            string maxname = "";
            int maxscore = -1;
            string[] arrays = textBox6.Lines;
            foreach (string array in arrays)
            {
                string[] a = array.Split('=');
                string name = a[0];
                string score = a[1];
                int scoretemp = Convert.ToInt32(score);
                if (scoretemp > maxscore)
                {
                    maxscore = scoretemp;
                    maxname = name;
                }
            }
            MessageBox.Show("第一名" + maxname + ",成绩" + maxscore);
        }
    }
}