login.aspx.cs

该系统实现在线考试功能

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

namespace TestOnline
{
	/// <summary>
	/// login 的摘要说明。
	/// </summary>
	public class login : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.TextBox Textbox_stuId;
		protected System.Web.UI.WebControls.TextBox Textbox_userPwd;
		protected System.Web.UI.WebControls.ImageButton ImageButton1;
		protected System.Web.UI.WebControls.ImageButton ImageButton2;
		protected System.Web.UI.WebControls.DropDownList DropDownList1;
		protected System.Web.UI.WebControls.Button RegisterBtn;
		protected System.Web.UI.WebControls.TextBox TextBox2;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			// 在此处放置用户代码以初始化页面
			
			Session.RemoveAll();
			//Response.Write("<script>document.all.Login.Textbox_stuId.focus()</script>");
		
		}

		#region Web 窗体设计器生成的代码
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{    
			this.ImageButton1.Click += new System.Web.UI.ImageClickEventHandler(this.ImageButton1_Click);
			this.ImageButton2.Click += new System.Web.UI.ImageClickEventHandler(this.ImageButton2_Click);
			this.RegisterBtn.Click += new System.EventHandler(this.RegisterBtn_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

	

		private void ImageButton1_Click(object sender, System.Web.UI.ImageClickEventArgs e)
		{
			if(Textbox_stuId.Text.Trim()==""||Textbox_userPwd.Text.Trim()=="")
			{
				if(Textbox_stuId.Text.Trim()==""&&Textbox_userPwd.Text.Trim()=="")
					Response.Write("<script>alert(\"用户名和密码不能为空！\");</script>");
				else if(Textbox_stuId.Text.Trim()=="")
					Response.Write("<script>alert(\"用户名不能为空！\");</script>");
				else if(Textbox_userPwd.Text.Trim()=="")
					Response.Write("<script>alert(\"密码不能为空！\");</script>");
				
				
			}
			else
			{
				int count=0;
			
				if(DropDownList1.SelectedValue=="学生")
				{
					string conn = "server=(local);database=TestOnline;user id=sa;pwd=ok";
					SqlConnection cn = new SqlConnection(conn);
					cn.Open();
					string strsql = "select stuID,stuPwd from student where stuID='" + Textbox_stuId.Text + "' or stuPwd='" + Textbox_userPwd.Text + "'";
					SqlCommand cmd = new SqlCommand(strsql, cn);
					SqlDataReader rd = cmd.ExecuteReader();
					if (rd.Read())
					{
						if (rd.GetValue(0).ToString() == Textbox_stuId.Text)
						{
							if (rd.GetValue(1).ToString() == Textbox_userPwd.Text)
							{
								string stuID=Textbox_stuId.Text.ToString();
								Session["stuID"]=stuID;
								Response.Redirect("userInfo.aspx");
							}
							else
							{
								Response.Write("<script>alert('密码错误！')</script>");
							}
						}
						else
						{
							Response.Write("<script>alert('用户名错误！')</script>");
						}
					}
					else
					{
						Response.Write("<script>alert('用户不存在！')</script>");
					}
				}
				else if(DropDownList1.SelectedValue=="管理员")
				{
					string conn = "server=(local);database=TestOnline;user id=sa;pwd=ok";
					SqlConnection cn = new SqlConnection(conn);
					cn.Open();
					string strsql = "select adminId,adminPwd from administrator where adminId='" + Textbox_stuId.Text + "' or adminPwd='" + Textbox_userPwd.Text + "'";
					SqlCommand cmd = new SqlCommand(strsql, cn);
					SqlDataReader rd = cmd.ExecuteReader();
					if (rd.Read())
					{
						if (rd.GetValue(0).ToString() == Textbox_stuId.Text)
						{
							if (rd.GetValue(1).ToString() == Textbox_userPwd.Text)
							{
								string adminId=Textbox_stuId.Text.ToString();
								Session["adminId"]=adminId;
								Response.Redirect("admin.aspx");
							}
							else
							{
								Response.Write("<script>alert('密码错误！')</script>");
							}
						}
						else
						{
							Response.Write("<script>alert('用户名错误！')</script>");
						}
					}
					else
					{
						Response.Write("<script>alert('用户不存在！')</script>");
					}
				}

			}
		
		}

		private void ImageButton2_Click(object sender, System.Web.UI.ImageClickEventArgs e)
		{
			Textbox_stuId.Text="";
			Textbox_userPwd.Text="";
		
		}

		protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
		{

		}

		private void RegisterBtn_Click(object sender, System.EventArgs e)
		{
			Response.Redirect("register.aspx");
		}
	}
}