C#学生信息管理系统

围绕ASP.NET开发技术和ACCESS数据库等方面知识构建的管理系统，采用了B/S结构，以便解决教师的成绩管理和学生的成绩查询实现跨区域操作，提升工作效率。

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            cx.Items.Add("管理员");
            cx.Items.Add("教师");
            cx.Items.Add("学生");
        }
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        if (TextBox2.Text.ToString().Trim() == "" || TextBox1.Text.ToString().Trim() == "")
        {
            Response.Write("<script>javascript:alert('请输入完整');history.back();</script>");
            Response.End();
        }
        string sql;
        sql = "";
        if (cx.SelectedItem.ToString().Trim() == "管理员")
        {
            sql = "select * from allusers where username='" TextBox1.Text.ToString().Trim() "' and pwd='" TextBox2.Text.ToString().Trim() "'";
        }
        if (cx.SelectedItem.ToString().Trim() == "教师")
        {
            sql = "select * from jiaoshi where yonghuming='" TextBox1.Text.ToString().Trim() "' and mima='" TextBox2.Text.ToString().Trim() "'";
        }
        if (cx.SelectedItem.ToString().Trim() == "学生")
        {
            sql = "select * from xuesheng where xuehao='" TextBox1.Text.ToString().Trim() "' and mima='" TextBox2.Text.ToString().Trim() "'";
        }
        DataSet result = new DataSet();
        result = new Class1().hsggetdata(sql);
        // result = new TestOnline.Class1().hsggetdata(sql);
        if (result != null)
        {
            if (result.Tables[0].Rows.Count > 0)
            {
                Session["username"] = TextBox1.Text.ToString().Trim();

                if (cx.SelectedItem.ToString().Trim() != "管理员")
                {
                    Session["role"] = result.Tables[0].Rows[0]["cx"].ToString().Trim();
                }
                else
                {
                    Session["role"] = cx.SelectedItem.ToString().Trim();
                }

                Response.Redirect("main.aspx");
            }
            else
            {
                Response.Write("<script>javascript:alert('对不起，用户名或密码不正确!');</script>");
            }
        }
        else
        {
            Response.Write("<script>javascript:alert('对不起，系统错误，请不要越权操作!');</script>");
        }
    }
}