yonghumimaxiugai.cs

Vs2005C#图书管理系统初学的看看有好处的

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

namespace tsh
{
    public partial class yonghumimaxiugai : Form
    {
        public yonghumimaxiugai()
        {
            InitializeComponent();
        }
        DB.ClsSQL sql = new DB.ClsSQL(".", "mylw", "sa", "", 3);
        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (!(((e.KeyChar >= '0') && (e.KeyChar <= '9')) || e.KeyChar <= 31) || e.KeyChar == '.')
            {
                e.Handled = true;
            }
            if (e.KeyChar == 13)
            {
                textBox2.Focus();
            }
        }

        private void textBox2_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode.ToString() == "Up")
                textBox1.Focus();
            if (e.KeyCode.ToString() == "Down")
                textBox3.Focus();

        }

        private void textBox1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode.ToString() == "Down")
                textBox2.Focus();
        }

        private void textBox3_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode.ToString() == "Up")
                textBox2.Focus();
            if (e.KeyCode.ToString() == "Down")
                textBox4.Focus();
        }

        private void textBox4_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode.ToString() == "Up")
                textBox3.Focus();
            if (e.KeyCode.ToString() == "Down")
                textBox1.Focus();
        }

        private void yonghumimaxiugai_Load(object sender, EventArgs e)
        {
            textBox1.Focus();
        }

        private void button1_Click(object sender, EventArgs e)
        {  DataSet ds;
            string s1="select * from employee where yuangongbianhao='"+textBox1.Text+"' and mima='"+textBox2.Text+"'";

            ds=sql.DBToDS(s1, "employee");
            if (ds.Tables["employee"].Rows.Count > 0)
            {
                if (textBox3.Text == textBox4.Text)
                {
                    string s2 = "update employee set mima='" + textBox3.Text + "' where  yuangongbianhao='" + textBox1.Text + "'";
                    sql.SQLCommand(s2);
                    MessageBox.Show("修改密码成功！！！", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
                    textBox1.Text = "";
                    textBox1.Focus();
                    textBox2.Text = "";
                    textBox3.Text = "";
                    textBox4.Text = "";

                }
                else
                {
                    MessageBox.Show("两次输入的新密码不一致！！！", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
                    textBox3.Text = "";
                    textBox3.Focus();
                    textBox4.Text = "";
                }
            }
            else
            {
                MessageBox.Show("帐号或密码错误！！！", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
                textBox1.Text = "";
                textBox1.Focus();
                textBox2.Text = "";
                textBox3.Text = "";
                textBox4.Text = "";
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void textBox2_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == 13)
            {
                textBox3.Focus();
            }

        }

        private void textBox3_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == 13)
            {
                textBox4.Focus();
            }
        }

        private void textBox4_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == 13)
            {
                textBox1.Focus();
            }
        }
    }
}