ASP.NET中的错误处理和程序优化

如何处理异常   如输入100超出范围的异常
 private void btnCal_Click(object sender, System.EventArgs e)
  {
   try
   {
    int nInput = int.Parse(tbInput.Text);
    long nResult=1;
    for(int i=1;i<=nInput;i++)
     checked{nResult *= i;}//处理异常
    lbResult.Text = nResult.ToString();
   }
   catch(OverflowException)//溢出错误异常处理
   {
    throw new Exception("输入的数字太大！");
   }
   catch(FormatException)//输入字符格式错误异常处理
   {
    Response.Write("要输入整数！");
   }
   catch(Exception ee)
   {
    Response.Write("发生错误，信息为："+ee.Message);
   } 
  }
  private void WebForm1_Error(object sender, System.EventArgs e)
  {//页面异常处理将异常写入Windows系统日志中
   string strMessage = Server.GetLastError().Message;
   //Response.Write(strMessage);
   Server.ClearError();
   //以下把信息写入windows日志
   //要把aspnet用户添加到管理员组中，以便有写注册表权限
   if(!EventLog.SourceExists("mySource"))
    EventLog.CreateEventSource("mySource","myLog");
   EventLog Event = new EventLog();
   Event.Source = "mySource";
   Event.WriteEntry(strMessage,EventLogEntryType.Warning);
   //EventLog.Delete("myLog");
   throw new Exception("这里处理不了，转到Global.asax处理！");
  }
Global.asax
  protected void Application_Error(Object sender, EventArgs e)
  {
   //把错误信息发送到作者
   string strPageUrl = Request.Path;
   Exception ErrorInfo =Server.GetLastError();
   //Server.ClearError();
   string strMessage = "Url:" + strPageUrl + "</br>";
   strMessage = strMessage + " Error: ";
   strMessage = strMessage + ErrorInfo.ToString() + "</br>";
   MailMessage Mymessage = new MailMessage();
   Mymessage.To = "[e-mail]'";
   Mymessage.From = [e-mail];
   Mymessage.Subject = "ASP.NET Error";
   Mymessage.BodyFormat = MailFormat.Text;
   Mymessage.Body = strMessage;
   SmtpMail.Send(Mymessage);
  }
Web.config     
<customErrors
    mode="On"
 defaultRedirect="CustomError.aspx"
    />

比较使用和不使用连接池所发费的时间
  private void btnOK_Click(object sender, System.EventArgs e)
  {
   string strConUnusePool = "server=(local);database=mydatabase;uid=sa;pwd=111;pooling=false";//不使用
   string strConusePool = "server=(local);database=mydatabase;uid=sa;pwd=111;pooling=true";
   int nConNum = int.Parse(tbNum.Text);
   //计算不使用连接池创建连接的时间
   DateTime dtStart = DateTime.Now;
   for(int i=1;i<=nConNum;i++)
   {
    SqlConnection con = new SqlConnection(strConUnusePool);
    con.Open();
    con.Close();
   }
   DateTime dtEnd = DateTime.Now;
   TimeSpan ts = dtEnd-dtStart;
   lbUnuse.Text = ts.Milliseconds.ToString();
   //计算使用连接池的时间
   dtStart = DateTime.Now;
   for(int i=1;i<=nConNum;i++)
   {
    SqlConnection con = new SqlConnection(strConusePool);
    con.Open();
    con.Close();
   }
   dtEnd = DateTime.Now;
   ts = dtEnd-dtStart;
   lbUse.Text = ts.Milliseconds.ToString();
  }

<%# DataBinder.Eval(Container.DataItem,"字段名")%>
效率更高
<@%((DataRowView)Container.DataItem)["字段名"]%>

关于缓存10秒刷新
<%@ OutPutCache Duration="10" VaryByParam="None"%>
  private void Page_Load(object sender, System.EventArgs e)
  {
   Response.Cache.SetExpires(DateTime.Now.AddSeconds(10));
   Response.Cache.SetCacheability(HttpCacheability.Public);
   lbTime.Text = DateTime.Now.ToLongTimeString();
  }

XML文件
<NewDataSet>
  <User>
    <CustName>Jack</CustName>
    <CustIdno>1</CustIdno>
    <CustCard>142123333321</CustCard>
  </User>
</NewDataSet>

private void Page_Load(object sender, System.EventArgs e)
  {
   if(!IsPostBack)
    LoadData();
  }
private void LoadData()
  {
   //当缓存对象DataCache5有效时，从缓存中读出客户信息；无效时，从文件读出信息
   DataView dv1 = (DataView)Cache["DataCache5"];
   if(dv1==null)
   {
    DataSet ds;
    FileStream fs;
    StreamReader sr;
    
    ds = new DataSet();
    fs = new FileStream(Server.MapPath("custom1.xml"),FileMode.Open,FileAccess.Read);
    sr = new StreamReader(fs);
    ds.ReadXml(sr);
    fs.Close();
    dv1=new DataView(ds.Tables[0]);
    Cache.Insert("DataCache5",dv1,new CacheDependency(Server.MapPath("custom1.xml")));
    lblMsg.Text="数据从文件中读出...";
   }
   else
       lblMsg.Text="数据从缓存中读出...";
   //绑定到DataGrid1对象
   dgShow.DataSource =  dv1;
   dgShow.DataBind();
  }

  private void AddBtn_Click(object sender, System.EventArgs e)
  {
   //增加一个客户信息到文件中
   FileStream FS;
   StreamReader Reader;
   DataSet DS;
   DataRow dr1;
   TextWriter tw1;
   if(!Page.IsValid)
    lblMsg.Text ="还有域未曾填充...";
   else
   {
    DS=new DataSet();
    FS=new FileStream(Server.MapPath("custom1.xml"),FileMode.Open,FileAccess.Read,FileShare.ReadWrite);
    Reader=new StreamReader(FS);
    DS.ReadXml(Reader);
    FS.Close();
    dr1=DS.Tables[0].NewRow();
    dr1["CustName"]=txtName.Text;
    dr1["CustIdno"]=txtIdno.Text;
    dr1["CustCard"]=txtCard.Text;
    DS.Tables[0].Rows.Add(dr1);
    FS=new FileStream(Server.MapPath("custom1.xml"),FileMode.Create,FileAccess.ReadWrite,FileShare.ReadWrite);
    tw1=new StreamWriter(FS);
    tw1=TextWriter.Synchronized(tw1);
    DS.WriteXml(tw1);
    tw1.Close();
    LoadData();
   }
  }

  private void btnFresh_Click(object sender, System.EventArgs e)
  {
   LoadData();  
  }