login.cs

学生成绩管理系统 用于建议的学生成绩管理 有登录 修改成绩 添加学生资料 删除学生资料等功能

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

namespace student
{


    public partial class Login : Form
    {

        public Login()
        {
            InitializeComponent();
            this.Text = "学生管理系统";
            this.StartPosition = FormStartPosition.CenterScreen;
        }


        public string StuName;
        public string StuID;

        private void loginbtn_Click(object sender, EventArgs e)
        {
            string ConnString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=..\\..\\Students.mdb";
            string MyString = "SELECT StuID,Pwd,StuName FROM Students WHERE [StuID] = @ID";
            OleDbConnection Conn = new OleDbConnection(ConnString);
            OleDbCommand MyCmd = new OleDbCommand(MyString, Conn);
            OleDbDataReader myReader;
            MyCmd.Parameters.AddWithValue("@ID", StuIDText.Text); //传递输入框的值

            Conn.Open();
            myReader = MyCmd.ExecuteReader();
            if (myReader.Read() == false)
            {
                MessageBox.Show("学号错误，请输入正确的学号！", "温馨提示！", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            if (PwdText.Text == myReader.GetValue(1).ToString())
            {

                StuID = myReader.GetValue(0).ToString();

            }
            else
            {
                MessageBox.Show("密码错误！", "温馨提示！", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }

            MainForm login = new MainForm();
            login.Show();
            Conn.Close();
            this.Hide();

            if (StuIDText.Text == "")
            {
                MessageBox.Show("请输入学号！", "温馨提示！", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            if (PwdText.Text == "")
            {
                MessageBox.Show("请输入密码！", "温馨提示！", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
        }

        private void exitbtn_Click_1(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void linkLabel1_LinkClicked_1(object sender, LinkLabelLinkClickedEventArgs e)
        {
            MessageBox.Show("学生学号格式为：2006**，初始密码跟学生学号相同。", "温馨提示！", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            return;
        }

        private void Login_Load(object sender, EventArgs e)
        {

        }

    }
}