<img src="smiley.gif" alt="Smiley face" height="42" width="42">

public static MvcHtmlString MenuLink(this HtmlHelper helper, string text, string action, string controller)
{            
    var routeData = helper.ViewContext.RouteData.Values;
    var currentController = routeData["controller"];
    var currentAction = routeData["action"];             
 
    if(String.Equals(action, currentAction as string,
              StringComparison.OrdinalIgnoreCase)
        &&
       String.Equals(controller, currentController as string,
               StringComparison.OrdinalIgnoreCase))
        
    {
       return helper.ActionLink(
           text,action, controller, null,
           new { @class="currentMenuItem"}
           );
    }
    return helper.ActionLink(text, action, controller);
}

<li>@Html.MenuLink("Contact", "Contact", "Home")</li>

ul#menu li a {
    background: none;
    color: #999;
    padding: 5px;
    border-radius: 15px;
    text-decoration: none;
}
 
ul#menu li a.currentMenuItem {
    background-color: black;   
    color: white;
}

public static MvcHtmlString MenuLinkBootstrap(this HtmlHelper helper, string text, string action, string controller)
{

    var routeData = helper.ViewContext.RouteData.Values;
    var currentController = routeData["controller"];
    var currentAction = routeData["action"];

   if (String.Equals(action, currentAction as string, StringComparison.OrdinalIgnoreCase) && String.Equals(controller, currentController as string, StringComparison.OrdinalIgnoreCase))
   {
        return new MvcHtmlString("<li class=\"active\">" + helper.ActionLink(text, action, controller) + "</li>");
   }
   
    return new MvcHtmlString("<li>" + helper.ActionLink(text, action, controller) + "</li>");

}

using System;
using System.Web.Mvc;

namespace MvcApplication13.Controllers
{
    public class HomeController : Controller
    {
        [HandleError]
        public ActionResult Index()
        {
            throw new InvalidOperationException();
            return View();
        }
    }
}

<system.web>
   <customErrors mode="On" />

GlobalFilters.Filters.Add(new HandleErrorAttribute());

[HandleError(View = "CustomErrorView")]

[HandleError(ExceptionType = typeof(NullReferenceException), View = "ErrorHandling")]

@model System.Web.Mvc.HandleErrorInfo
            
@{
    ViewBag.Title = "DbError";
}
 
<h2>An Error Has Occurred</h2>
 
@if (Model != null)
{
    <p>@Model.Exception.GetType().Name<br />
    thrown in @Model.ControllerName @Model.ActionName</p>
}

<customErrors mode="On" defaultRedirect="error">
      <error statusCode="404" redirect="error/notfound" />
      <error statusCode="403" redirect="error/forbidden" />
</customErrors>

using System.Web.Mvc;

namespace MvcApplication13.Controllers
{
    public class ErrorController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult NotFound()
        {
            return View();
        }

        public ActionResult Forbidden()
        {
            return View();
        }
    }
}

<configuration>
  <configSections>
    <sectionGroup name="elmah">
      <section name="security" requirePermission="false" type="Elmah.SecuritySectionHandler, Elmah"/>
      <section name="errorLog" requirePermission="false" type="Elmah.ErrorLogSectionHandler, Elmah"/>
      <section name="errorMail" requirePermission="false" type="Elmah.ErrorMailSectionHandler, Elmah"/>
      <section name="errorFilter" requirePermission="false" type="Elmah.ErrorFilterSectionHandler, Elmah"/>
      <section name="errorTweet" requirePermission="false" type="Elmah.ErrorTweetSectionHandler, Elmah"/>
    </sectionGroup>
  </configSections>

<elmah>
    <security allowRemoteAccess="1"/>
    <errorLog type="Elmah.XmlFileErrorLog, Elmah" logPath="~/App_Data/ErrorsLog"/>
  </elmah>

<httpModules>
      <add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah"/>      
</httpModules>
<httpHandlers>
      <add verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah"/>      
</httpHandlers>

<system.webServer>
    <validation validateIntegratedModeConfiguration="false"/>
    <modules runAllManagedModulesForAllRequests="true">
      <add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah"/>
    </modules>
    <handlers>
      <add name="Elmah" verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah"/>
    </handlers>
</system.webServer>

public static void RegisterRoutes(RouteCollection routes)
{
    //routes.IgnoreRoute("elmah.axd");
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

filters.Add(new HandleErrorAttribute());

using System.Web.Mvc;
using Elmah;

namespace MvcApplication13.CustomFilters
{
    public class ElmahHandledErrorLoggerFilter : IExceptionFilter
    {
        public void OnException(ExceptionContext context)
        {
            if (context.ExceptionHandled)
                ErrorSignal.FromCurrentContext().Raise(context.Exception);
            // all other exceptions will be caught by ELMAH anyway
        }
    }
}

public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
      filters.Add(new ElmahHandledErrorLoggerFilter());
      filters.Add(new HandleErrorAttribute());
}

//It's only for code review purpose!
protected void Button1_Click1(object sender, EventArgs e)
{        
        string  strcon;        
        string strUserURL;
        string strSQL;
        string strSQL1;
        strSQL = "SELECT UserLevel FROM listuser " + "WHERE Username='" + TextBox2.Text + "' " + "And Password='" + TextBox3.Text + "';";
        strSQL1 = "SELECT Pnumber FROM listuser " + "WHERE Username='" + TextBox2.Text + "' " + "And Password='" + TextBox3.Text + "';";
        strcon = @"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\bimaran.mdf;Integrated Security=True;User Instance=True";
        SqlConnection myConnection = new SqlConnection(strcon);

        SqlCommand myCommand = new SqlCommand(strSQL, myConnection);
        SqlCommand myCommand1 = new SqlCommand(strSQL1, myConnection);
        myConnection.Open();

        strUserURL = (string)myCommand.ExecuteScalar();
        send = (string)myCommand1.ExecuteScalar();
        myCommand.Dispose();
        myCommand1.Dispose();
        myConnection.Close();


        if (strUserURL != null)
        {                      
            Label1.Text = "";

            url = "?Pn=" + code(send);
            FormsAuthentication.SetAuthCookie(TextBox2.Text, true);
            Response.Redirect("Page/" + strUserURL + url);
       }
        else
            Label3.Text = "چنین کاربری با این مشخصات ثبت نشده است.";
}

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;

namespace ObjectInitSpeedTest
{
   class Program
   {
       //Note: don't forget to build it in Release mode.
       static void Main()
       {
           normalSpeedTest();           
           parallelSpeedTest();

           Console.ForegroundColor = ConsoleColor.White;
           Console.WriteLine("Press a key ...");
           Console.ReadKey();
       }

       private static void parallelSpeedTest()
       {
           Console.ForegroundColor = ConsoleColor.Yellow;
           Console.WriteLine("parallelSpeedTest");

           long totalObjectsCreated = 0;
           long totalElapsedTime = 0;

           var tasks = new List<Task>();
           var processorCount = Environment.ProcessorCount;

           Console.WriteLine("Running on {0} cores", processorCount);

           for (var t = 0; t < processorCount; t++)
           {
               tasks.Add(Task.Factory.StartNew(
               () =>
               {
                   const int reps = 1000000000;
                   var sp = Stopwatch.StartNew();
                   for (var j = 0; j < reps; ++j)
                   {
                       new object();
                   }
                   sp.Stop();

                   Interlocked.Add(ref totalObjectsCreated, reps);
                   Interlocked.Add(ref totalElapsedTime, sp.ElapsedMilliseconds);
               }
               ));
           }

           // let's complete all the tasks
           Task.WaitAll(tasks.ToArray());

           Console.WriteLine("Created {0:N} objects in 1 sec\n", (totalObjectsCreated / (totalElapsedTime / processorCount)) * 1000);
       }

       private static void normalSpeedTest()
       {
           Console.ForegroundColor = ConsoleColor.Green;
           Console.WriteLine("normalSpeedTest");

           const int reps = 1000000000;
           var sp = Stopwatch.StartNew();
           sp.Start();
           for (var j = 0; j < reps; ++j)
           {
               new object();
           }
           sp.Stop();

           Console.WriteLine("Created {0:N} objects in 1 sec\n", (reps / sp.ElapsedMilliseconds) * 1000);
       }
   }
}