大家进来帮帮小弟,很简单的问题.多谢!!

这段代码"clear.aspx"是用来清空数据库的,如何在点击该页上某一个清除按钮后,先出一个窗口提示是否确定清除,然后有确定或取消,如果点取消返回页面,如果点确定后,再跳出一个小窗口,显示该表已经清空,然后点确定关闭小窗口,,如何做?. 另外在该页面下添加一个返回按钮,返回上一页,比如上一页是"clearlogin.aspx".哪位大侠能直接把这三个功能添加到小弟代码中啊,谢谢!!
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 CourseWork3
{
/// <summary>

/// </summary>
public class WebForm12 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Label Label1;
protected System.Web.UI.WebControls.Button Button1;
protected System.Web.UI.WebControls.Button Button2;
protected System.Web.UI.WebControls.Button Button3;
protected System.Web.UI.WebControls.Button Button4;
protected System.Web.UI.WebControls.Button Button5;
protected System.Web.UI.WebControls.Label Label2;
protected System.Data.SqlClient.SqlConnection VisitConnection;

private void Page_Load(object sender, System.EventArgs e)
{

} #region 
override protected void OnInit(EventArgs e)
{
//

//
InitializeComponent();
base.OnInit(e);
}

/// <summary>

/// </summary>
private void InitializeComponent()
{    
this.VisitConnection = new System.Data.SqlClient.SqlConnection();
this.Button5.Click += new System.EventHandler(this.Button5_Click);
this.Button4.Click += new System.EventHandler(this.Button4_Click);
this.Button3.Click += new System.EventHandler(this.Button3_Click);
this.Button2.Click += new System.EventHandler(this.Button2_Click);
this.Button1.Click += new System.EventHandler(this.Button1_Click);
// 
// VisitConnection
// 
this.VisitConnection.ConnectionString = "workstation id=erhtrc;packet size=4096;integrated security=SSPI;data source=erthr" +
"c;persist security info=False;initial catalog=VisitDays";
this.Load += new System.EventHandler(this.Page_Load); }
#endregion private void Button1_Click(object sender, System.EventArgs e)
{
try
{
VisitConnection.Open();
SqlCommand cmd = 
new SqlCommand("delete from Applicant",VisitConnection);
cmd.ExecuteReader();
}
finally{
VisitConnection.Close();
  
}

} private void Button2_Click(object sender, System.EventArgs e)
{
try
{
VisitConnection.Open();
SqlCommand cmd = 
new SqlCommand("delete from Applications",VisitConnection);
cmd.ExecuteReader();
}
finally
{
VisitConnection.Close();
  
}

} private void Button3_Click(object sender, System.EventArgs e)
{
try
{
VisitConnection.Open();
SqlCommand cmd = 
new SqlCommand("delete from Attending",VisitConnection);
cmd.ExecuteReader();
}
finally
{
VisitConnection.Close();
  
}
} private void Button4_Click(object sender, System.EventArgs e)
{
try
{
VisitConnection.Open();
SqlCommand cmd = 
new SqlCommand("delete from Course",VisitConnection);
cmd.ExecuteReader();
}
finally
{
VisitConnection.Close();
  
}

} private void Button5_Click(object sender, System.EventArgs e)
{
try
{
VisitConnection.Open();
SqlCommand cmd = 
new SqlCommand("delete from OpenDay",VisitConnection);
cmd.ExecuteReader();
}
finally
{
VisitConnection.Close();
  
}
}
}
}