在Application_Start中添加以下代码：
Application["ConnStr"]=this.Context.Request.PhysicalApplicationPath+ConfigurationSettings. AppSettings["ConnStr"].ToString();字符型转换 转为字符串
12345.ToString("n"); //生成 12,345.00 12345.ToString("C"); //生成 ￥12,345.00 12345.ToString("e"); //生成 1.234500e+004 12345.ToString("f4"); //生成 12345.0000 12345.ToString("x"); //生成 3039 (16进制) 12345.ToString("p"); //生成 1,234,500.00% 截取字串的一部分，参数1为左起始位数，参数2为截取几位。 如：string s1 = str.Substring(0,2);
34.在自己的网站上登陆其他网站：(如果你的页面是通过嵌套方式的话，因为一个页面只能有一个FORM，这时可以导向另外一个页面再提交登陆信息)
＜SCRIPT language="javascript"＞ ＜!-- function gook(pws) { frm.submit(); } //--＞ ＜/SCRIPT＞ ＜body leftMargin="0" topMargin="0" onload="javascript:gook()" marginwidth="0" marginheight="0"＞ ＜form name="frm" action=" http://220.194.55.68:6080/login.php?retid=7259 " method="post"＞ ＜tr＞ ＜td＞＜input id="f_user" type="hidden" size="1" name="f_user" runat="server"＞＜input id="f_domain" type="hidden" size="1" name="f_domain" runat="server"＞＜input class="box" id="f_pass" type="hidden" size="1" name="pwshow" runat="server"＞ ＜INPUT id="lng" type="hidden" maxLength="20" size="1" value="5" name="lng"＞＜INPUT id="tem" type="hidden" size="1" value="2" name="tem"＞ ＜/td＞ ＜/tr＞ ＜/form＞ 下面是获取用户输入的登陆信息的代码：
string name; name=Request.QueryString["EmailName"]; try { int a=name.IndexOf("@",0,name.Length); f_user.Value=name.Substring(0,a); f_domain.Value=name.Substring(a+1,name.Length-(a+1)); f_pass.Value=Request.QueryString["Psw"]; } catch { Script.Alert("错误的邮箱!"); Server.Transfer("index.aspx"); }
/// <summary> 
/// 服务器端弹出alert对话框 /// </summary> /// <param name="str_Message">提示信息,例子："不能为空!"</param> 
/// <param name="page">Page类</param> public void Alert(string str_Message,Page page) { page.RegisterStartupScript("","<script>alert('"+str_Message+"');</script>"); } /// <summary> /// 服务器端弹出alert对话框，并使控件获得焦点 /// </summary> /// <param name="str_Ctl_Name">获得焦点控件Id值,比如：txt_Name</param> /// <param name="str_Message">提示信息,例子："请输入您姓名!"</param> /// <param name="page">Page类</param> public void Alert(string str_Ctl_Name,string str_Message,Page page) { page.RegisterStartupScript("","<script>alert('"+str_Message+"');document.forms(0)."+str_Ctl_Name+".focus(); document.forms(0)."+str_Ctl_Name+".select();</script>"); } /// <summary> /// 服务器端弹出confirm对话框 /// </summary> /// <param name="str_Message">提示信息,例子："您是否确认删除!"</param> /// <param name="btn">隐藏Botton按钮Id值,比如：btn_Flow</param> /// <param name="page">Page类</param> public void Confirm(string str_Message,string btn,Page page) { page.RegisterStartupScript("","<script> if (confirm('"+str_Message+"')==true){document.forms(0)."+btn+".click();}</script>"); } /// <summary> /// 服务器端弹出confirm对话框,询问用户准备转向那些操作，包括“确定”和“取消”时的操作 /// </summary> /// <param name="str_Message">提示信息，比如："成功增加数据,单击\"确定\"按钮填写流程,单击\"取消\"修改数据"</param> /// <param name="btn_Redirect_Flow">"确定"按钮id值</param> /// <param name="btn_Redirect_Self">"取消"按钮id值</param> /// <param name="page">Page类</param> public void Confirm(string str_Message,string btn_Redirect_Flow,string btn_Redirect_Self,Page page) { page.RegisterStartupScript("","<script> if (confirm('"+str_Message+"')==true){document.forms(0)."+btn_Redirect_Flow+".click();}else{document.forms(0)."+btn_Redirect_Self+".click();}</script>"); } /// <summary> /// 使控件获得焦点 /// </summary> /// <param name="str_Ctl_Name">获得焦点控件Id值,比如：txt_Name</param> /// <param name="page">Page类</param> public void GetFocus(string str_Ctl_Name,Page page) { page.RegisterStartupScript("","<script>document.forms(0)."+str_Ctl_Name+".focus(); document.forms(0)."+str_Ctl_Name+".select();</script>"); } ///<summary> ///名称：redirect ///功能：子窗体返回主窗体 ///参数：url ///返回值：空 ///</summary> public void redirect(string url,Page page) { if ( Session["IfDefault"]!=(object)"Default") 
{ 
page.RegisterStartupScript("","<script>window.top.document.location.href='"+url+"';</script>"); 
} } 整理了一些常用的.NET代码，贴出来供大家参考，并希望我们一起搜集更多的内容。
一、为GridView添加索引列
<asp:TemplateField HeaderText="ID"> <ItemTemplate> <%# Container.DataItemIndex +1 %> </ItemTemplate></asp:TemplateField>二、批量删除列
模板列代码：
<asp:TemplateField HeaderText="选择"> <ItemTemplate> <asp:CheckBox ID="chkSelect" runat="server" /> </ItemTemplate></asp:TemplateField>for (int i = 0; i < gv.Rows.Count; i++) { CheckBox chkSelect = (CheckBox)gv.Rows[i].FindControl("chkSelect"); chkSelect.Checked = true; }for (int i = 0; i < gv.Rows.Count; i++) { CheckBox chkSelect = (CheckBox)gv.Rows[i].FindControl("chkSelect"); chkSelect.Checked = !chkSelect.Checked; }for (int i = 0; i < gv.Rows.Count; i++) { CheckBox chkSelect = (CheckBox)gv.Rows[i].FindControl("chkSelect"); chkSelect.Checked = false; }for (int i = 0; i < gv.Rows.Count; i++) { CheckBox chkSelect = (CheckBox)gv.Rows[i].FindControl("chkSelect"); if (chkSelect.Checked) { //删除记录 } }三、删除表格选定记录
int id = (int)MyDataGrid.DataKeys[e.Item.ItemIndex]; //在调用前必须指定DataKeyNames属性为要获取的主键。string deleteCmd = "DELETE from Employee where emp_id = " + intEmpID.ToString();四、为按钮添加确认对话框
button.Attributes.Add("onclick","return confirm(’确认?’)"); 五、点击表格行链接另一页
private void grdCustomer_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) { //点击表格打开 if (e.Item.ItemType == ListItemType.Item e.Item.ItemType == ListItemType.AlternatingItem) e.Item.Attributes.Add("onclick","window.open(’Default.aspx?id=" + e.Item.Cells[0].Text + "’);"); } 六、超连接列传递参数
＜asp:HyperLinkColumn Target="_blank" headertext="ID号" DataTextField="id" NavigateUrl="aaa.aspx?id=’ ＜%# DataBinder.Eval(Container.DataItem, "数据字段1")%＞’ & name=’＜%# DataBinder.Eval(Container.DataItem, "数据字段2")%＞’ /＞ 七、绑定日期格式
e.items.cell["time"].text=DateTime.Parse(e.items.cell["time"].text.ToString("yyyy-MM-dd")) 八、统一捕获异常 Global.asax中：
protected void Application_Error(Object sender, EventArgs e) { if (Server.GetLastError() is HttpUnhandledException) Server.Transfer("MyErrorPage.aspx"); //编写添加到日志的代码Log.add();} 九、自定义异常处理
using System; using System.Diagnostics; namespace MyAppException { /// ＜summary＞ /// 从系统异常类ApplicationException继承的应用程序异常处理类。 /// 自动将异常内容记录到Windows NT/2000的应用程序日志 /// ＜/summary＞ public class AppException:System.ApplicationException { public AppException() { if (ApplicationConfiguration.EventLogEnabled)LogEvent("出现一个未知错误。"); } public AppException(string message) { LogEvent(message); } public AppException(string message,Exception innerException) { LogEvent(message); if (innerException != null) { LogEvent(innerException.Message); } } //日志记录类 using System; using System.Configuration; using System.Diagnostics; using System.IO; using System.Text; using System.Threading; namespace MyEventLog { /// ＜summary＞ /// 事件日志记录类，提供事件日志记录支持 /// ＜remarks＞ /// 定义了4个日志记录方法 (error, warning, info, trace) /// ＜/remarks＞ /// ＜/summary＞ public class ApplicationLog { /// ＜summary＞ /// 将错误信息记录到Win2000/NT事件日志中 /// ＜param name="message"＞需要记录的文本信息＜/param＞ /// ＜/summary＞ public static void WriteError(String message) { WriteLog(TraceLevel.Error, message); } /// ＜summary＞ /// 将警告信息记录到Win2000/NT事件日志中 /// ＜param name="message"＞需要记录的文本信息＜/param＞ /// ＜/summary＞ public static void WriteWarning(String message) { WriteLog(TraceLevel.Warning, message); } /// ＜summary＞ /// 将提示信息记录到Win2000/NT事件日志中 /// ＜param name="message"＞需要记录的文本信息＜/param＞ /// ＜/summary＞ public static void WriteInfo(String message) { WriteLog(TraceLevel.Info, message); } /// ＜summary＞ /// 将跟踪信息记录到Win2000/NT事件日志中 /// ＜param name="message"＞需要记录的文本信息＜/param＞ /// ＜/summary＞ public static void WriteTrace(String message) { WriteLog(TraceLevel.Verbose, message); } /// ＜summary＞ /// 格式化记录到事件日志的文本信息格式 /// ＜param name="ex"＞需要格式化的异常对象＜/param＞ /// ＜param name="catchInfo"＞异常信息标题字符串.＜/param＞ /// ＜retvalue＞ /// ＜para＞格式后的异常信息字符串，包括异常内容和跟踪堆栈.＜/para＞ /// ＜/retvalue＞ /// ＜/summary＞ public static String FormatException(Exception ex, String catchInfo) { StringBuilder strBuilder = new StringBuilder(); if (catchInfo != String.Empty) { strBuilder.Append(catchInfo).Append("\r\n"); } strBuilder.Append(ex.Message).Append("\r\n").Append(ex.StackTrace); return strBuilder.ToString(); } /// ＜summary＞ /// 实际事件日志写入方法 /// ＜param name="level"＞要记录信息的级别（error,warning,info,trace).＜/param＞ /// ＜param name="messageText"＞要记录的文本.＜/param＞ /// ＜/summary＞ private static void WriteLog(TraceLevel level, String messageText) { try { EventLogEntryType LogEntryType; switch (level) { case TraceLevel.Error: LogEntryType = EventLogEntryType.Error; break; case TraceLevel.Warning: LogEntryType = EventLogEntryType.Warning; break; case TraceLevel.Info: LogEntryType = EventLogEntryType.Information; break; case TraceLevel.Verbose: LogEntryType = EventLogEntryType.SuccessAudit; break; default: LogEntryType = EventLogEntryType.SuccessAudit; break; } EventLog eventLog = new EventLog("Application", ApplicationConfiguration.EventLogMachineName, ApplicationConfiguration.EventLogSourceName ); //写入事件日志 eventLog.WriteEntry(messageText, LogEntryType); } catch {} //忽略任何异常 } } //class ApplicationLog } 十、Panel 横向滚动，纵向自动扩展
＜asp:panel style="overflow-x:scroll;overflow-y:auto;"＞＜/asp:panel＞十一、DataGrid行随鼠标变色
private void ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) { if (e.Item.ItemType!=ListItemType.Header) { e.Item.Attributes.Add( "onmouseout","this.style.backgroundColor=\""+e.Item.Style["BACKGROUND-COLOR"]+"\""); e.Item.Attributes.Add( "onmouseover","this.style.backgroundColor=\""+ "#EEE6F8"+"\""); } } 十二、读取DataGrid控件的TextBox值
foreach(DataGrid dgi in yourDataGrid.Items) { TextBox tb = (TextBox)dgi.FindControl("yourTextBoxId"); tb.Text
. } 十三、当点击编辑键时，控制文本框的大小
private void DataGrid1_ItemDataBound(obj sender,DataGridItemEventArgs e) { for(int i=0;i＜e.Item.Cells.Count-1;i++) if(e.Item.ItemType==ListItemType.EditType) { e.Item.Cells[i].Attributes.Add("Width", "80px") } } 十四、弹出对话框
private static string ScriptBegin = "＜script language=\"JavaScript\"＞"; private static string ScriptEnd = "＜/script＞"; public static void ConfirmMessageBox(string PageTarget,string Content) { string ConfirmContent="var retValue=window.confirm(’"+Content+"’);"+"if(retValue){window.location=’"+PageTarget+"’;}"; ConfirmContent=ScriptBegin + ConfirmContent + ScriptEnd; Page ParameterPage = (Page)System.Web.HttpContext.Current.Handler; ParameterPage.RegisterStartupScript("confirm",ConfirmContent); //Response.Write(strScript); }