如何为下一个&上一个按钮?

编程入门行业动态更新时间:2024-10-28 06:32:10

本文介绍了如何为下一个&上一个按钮?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述

我正在使用ASP.NET(C#)&SQL服务器.这是我的代码.我在实现下一个&的代码时遇到问题上一个按钮.请给我建议答案.谢谢.

I am developing an online exam system project using ASP.NET (C#) & SQL Sever. This is my code. I have a problem in implementing code for next & previous button. Please suggest me the answer. Thank you.

public partial class Default : Page { int count; string ans; int[] a=new int[5]; int t; int ctr; SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["ConnectionString"].ToString()); SqlDataAdapter da = new SqlDataAdapter(); SqlCommand cmd = new SqlCommand(); DataSet ds = new DataSet(); DateTime myDate; DataTable dt = new DataTable(); DataRow dr; public void Show() { Session["Answered"] = dt; View v = this.View1; Label l = default(Label); l = (Label)v.FindControl("Label1"); l.Text = dt.Rows[ctr]["Serial"] + "."; l = (Label)v.FindControl("Label2"); l.Text = dt.Rows[ctr]["question"].ToString(); RadioButtonList r = default(RadioButtonList); r = (RadioButtonList)v.FindControl("RadioButtonList1"); r.Items.Clear(); r.Items.Add(dt.Rows[ctr]["choice1"].ToString()); r.Items.Add(dt.Rows[ctr]["choice2"].ToString()); r.Items.Add(dt.Rows[ctr]["choice3"].ToString()); r.Items.Add(dt.Rows[ctr]["choice4"].ToString()); r.SelectedIndex = Convert.ToInt32(dt.Rows[ctr]["selected"]); Session["ctr"] = ctr; } protected void Timer1_Tick(object sender, System.EventArgs e) { DateTime mydate2 = DateTime.Now; DateTime mydate3 = default(DateTime); try { mydate3 = Convert.ToDateTime((myDate - mydate2).ToString()); this.Label5.Text = "Time Left: " + mydate3.ToShortTimeString(); } catch (Exception ex) { this.Label5.Text = "Error Setting up the Timer. Contact Admin"; } if (mydate3.ToShortTimeString() == "00:00:00") { int marks = 0; Session["Answered"] = dt; Response.Redirect("default3.aspx?marks=" + marks); } } protected void Page_Load(object sender, System.EventArgs e) { DateTime myDate = new DateTime(); myDate =Convert.ToDateTime(Request.Cookies["start"].Value); if (!IsPostBack) { this.MultiView1.ActiveViewIndex = 0; conn.Open(); cmd.Connection = conn; Random arbit = new Random(); for (int i = 0; i <= a.GetUpperBound(0); i++) { t = arbit.Next(1, 10); if (Array.IndexOf(a, t) == -1) { a[i] = t; } else { goto X; } } for (int i = 0; i <= 4; i++) { cmd.CommandText = "select * from test where Serial=" + a[i]; da.SelectCommand = cmd; da.Fill(ds, "test"); } conn.Close(); dt = new DataTable("Answered"); dt.Columns.Add("Serial", typeof(int)); dt.Columns.Add("question", typeof(string)); dt.Columns.Add("choice1", typeof(string)); dt.Columns.Add("choice2", typeof(string)); dt.Columns.Add("choice3", typeof(string)); dt.Columns.Add("choice4", typeof(string)); dt.Columns.Add("correct", typeof(string)); dt.Columns.Add("selected", typeof(int)); DataRow r = null; foreach (DataRow r_loopVariable in ds.Tables["test"].Rows) { r = r_loopVariable; dr = dt.NewRow(); dr["Serial"] = dt.Rows.Count + 1; dr["question"] = r["question"]; dr["choice1"] = r["choice1"]; dr["choice2"] = r["choice2"]; dr["choice3"] = r["choice3"]; dr["choice4"] = r["choice4"]; dr["correct"] = r["correct"]; dr["selected"] = -1; dt.Rows.Add(dr); } Session["Answered"] = dt; Show(); } } protected void btnNext_Click(object sender, EventArgs e) { Session["ctr"] = ctr; Session["Answered"] = dt; Session["ctr"] = ctr; ctr += 1; Show(); if (ctr == 4) { this.btnNext.Enabled = false; } this.btnPrev.Enabled = true; } protected void btnPrev_Click(object sender, EventArgs e) { Session["ctr"] = ctr; Session["Answered"] = dt; ctr = ctr - 1; if (ctr == 0) { this.btnPrev.Enabled = false; } Session["ctr"] = ctr; this.btnNext.Enabled = true; Show(); } protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e) { RadioButtonList1.SelectedIndexChanged += new EventHandler(RadioButtonList1_SelectedIndexChanged); Session["Answered"] = dt; } protected void btnShowMarks_Click(object sender, EventArgs e) { int marks = 0; Session["Answered"] = dt; Response.Redirect("default3.aspx?marks=" + marks); Session["marks"] = dt; int []b=new int[6]; foreach (int c in b) { RadioButtonList1.SelectedIndex.ToString(); } } }

推荐答案

我建议您使用向导控件.以下是一些示例: