The problem lies in following code:

    if (System.Web.HttpContext.Current.Response.Cookies[&quot;CountryPreference&quot;] == null)

When you try to check existence of a cookie using Response object rather than Request, ASP.net automatically creates a cookie. 

Check this detailed post here: [http://chwe.at/blog/post/2009/01/26/Done28099t-use-ResponseCookiesstring-to-check-if-a-cookie-exists!.aspx][1]

---

Quote from the article in case the link goes down again ....

&gt; The short explanation, if you don’t
&gt; like to read the entire story
&gt; 
&gt; If you use code like “if
&gt; (Response.Cookies[“mycookie”] != null)
&gt; { … }”, ASP.Net automatically
&gt; generates a new cookie with the name
&gt; “mycookie” in the background and
&gt; overwrites your old cookie! Always use
&gt; the Request.Cookies-Collection to read
&gt; cookies!

[ [More detail in the article][1] ]


  [1]: http://chwe.at/blog/post/2009/01/26/Done28099t-use-ResponseCookiesstring-to-check-if-a-cookie-exists!.aspx

In resume, don&#39;t use &quot;**Response**&quot; to read cookies, use &quot;**Request**&quot;.



**Edit:** I apologize everybody. I used the term &quot;jagged array&quot; when I actually meant to say &quot;multi-dimensional array&quot; (as can be seen in my example below). I apologize for using the incorrect name. I actually found jagged arrays to be faster than multi-dimensional ones! I have added my measurements for jagged arrays.

I was trying to use a &lt;del&gt;jagged&lt;/del&gt; multi-dimensional array today, when I noticed that it&#39;s performance is not as I would have expected. Using a single-dimensional array and manually calculating indices was much faster (almost two times) than using a 2D array. I wrote a test using  `1024*1024` arrays (initialized to random values), for 1000 iterations, and I got the following results on my machine:

    sum(double[], int): 2738 ms (100%)
    sum(double[,]):     5019 ms (183%)
    sum(double[][]):    2540 ms ( 93%)

This is my test code:

    public static double sum(double[] d, int l1) {
        // assuming the array is rectangular
        double sum = 0;
        int l2 = d.Length / l1;
        for (int i = 0; i &lt; l1; ++i)
            for (int j = 0; j &lt; l2; ++j)
                sum += d[i * l2 + j];
        return sum;
    }

    public static double sum(double[,] d) {
        double sum = 0;
        int l1 = d.GetLength(0);
        int l2 = d.GetLength(1);
        for (int i = 0; i &lt; l1; ++i)
            for (int j = 0; j &lt; l2; ++j)
                sum += d[i, j];
        return sum;
    }

    public static double sum(double[][] d) {
        double sum = 0;
        for (int i = 0; i &lt; d.Length; ++i)
            for (int j = 0; j &lt; d[i].Length; ++j)
                sum += d[i][j];
        return sum;
    }

    public static void Main() {
        Random random = new Random();
        const int l1  = 1024, l2 = 1024;
        double[ ] d1  = new double[l1 * l2];
        double[,] d2  = new double[l1 , l2];
        double[][] d3 = new double[l1][];

        for (int i = 0; i &lt; l1; ++i) {
            d3[i] = new double[l2];
            for (int j = 0; j &lt; l2; ++j)
                d3[i][j] = d2[i, j] = d1[i * l2 + j] = random.NextDouble();
        }
        //
        const int iterations = 1000;
        TestTime(sum, d1, l1, iterations);
        TestTime(sum, d2, iterations);
        TestTime(sum, d3, iterations);
    }

Further investigation showed that the IL for the second method is 23% larger than that of the first method. (Code size 68 vs 52.) This is mostly due to calls to `System.Array::GetLength(int)`. The compiler also emits calls to `Array::Get` for the &lt;del&gt;jagged&lt;/del&gt; multi-dimensional array, whereas it simply calls `ldelem` for the simple array.

So I am wondering, why is access through multi-dimensional arrays slower than normal arrays? I would have assumed the compiler (or JIT) would do something similar to what I did in my first method, but this was not actually the case.

Could you plese help me understand why this is happening the way it is?

----------

**Update:** Following Henk Holterman&#39;s suggestion, here is the implementation of `TestTime`:

    public static void TestTime&lt;T, TR&gt;(Func&lt;T, TR&gt; action, T obj,
                                       int iterations)
    {
        Stopwatch stopwatch = Stopwatch.StartNew();
        for (int i = 0; i &lt; iterations; ++i)
            action(obj);
        Console.WriteLine(action.Method.Name + &quot; took &quot; + stopwatch.Elapsed);
    }

    public static void TestTime&lt;T1, T2, TR&gt;(Func&lt;T1, T2, TR&gt; action, T1 obj1,
                                            T2 obj2, int iterations)
    {
        Stopwatch stopwatch = Stopwatch.StartNew();
        for (int i = 0; i &lt; iterations; ++i)
            action(obj1, obj2);
        Console.WriteLine(action.Method.Name + &quot; took &quot; + stopwatch.Elapsed);
    }


Why are multi-dimensional arrays in .NET slower than normal arrays?

I&#39;m taking over a development of a commercial web site. This site was developed over two years by another programmer. It&#39;s mostly a one-man job (maintain and expand the site). I&#39;ll have a 2-3 days transition period when the other programmer will show me the system. But from what I know, there is little documentation. Everything is in the code (which is kind of documented). Here is  what I&#39;m planning to ask so far:

 - Explanation on the most complex elements of the system
 - Description of the overall architecture
 - Description of the support tools (IDE setup, unit tests, deployment
   mechanism)
 - Any book, website, podcast he used to influence the architecture of the
   system

Any other I&#39;m missing?

[EDIT] Thanks everyone. Lost of good propositions. I wished I could accept more than one answer! Additionally, I would also add: 

 - What have you done specifically to improve the performance of the system, and where is the bottleneck right now?
 - Related to that, what have you done regarding the security of the system? (what have you done, and where are the security holes right now)

One last thing: the developer said that he will be available to to answer my questions later on if I need it. It&#39;s his &quot;baby&quot; after all. But I really think that in 6 months he will have moved on and his availability will be much more reduced!



Taking over a project - What should I ask the previous programmer?

I have a ASP MVC App with some seemingly simple code to save and retrieve cookies but for some reason they won&#39;t persist. The code in the controller is :

    if (System.Web.HttpContext.Current.Response.Cookies[&quot;CountryPreference&quot;] == null)
    {
        HttpCookie cookie = new HttpCookie(&quot;CountryPreference&quot;);
        cookie.Value = country;
        cookie.Expires = DateTime.Now.AddYears(1);
        System.Web.HttpContext.Current.Response.Cookies.Add(cookie);
    }

And to load it again :

    if (System.Web.HttpContext.Current.Request.Cookies[&quot;CountryPreference&quot;] != null)
    {
        System.Web.HttpContext.Current.Request.Cookies[&quot;CountryPreference&quot;].Expires = DateTime.Now.AddYears(1);
        data.Country = System.Web.HttpContext.Current.Request.Cookies[&quot;CountryPreference&quot;].Value;
    }

For some reason the cookie is always null?

ASP MVC Cookies not persisting

I have a ASP MVC App with some seemingly simple code to save and retrieve cookies but for some reason they won't persist. The code in the controller is :
<pre><code class="hljs language-ini">if (System.Web.HttpContext.Current.Response.Cookies["CountryPreference"] == null)
{
 HttpCookie cookie = new HttpCookie("CountryPreference");
 cookie.Value = country;
 cookie.Expires = DateTime.Now.AddYears(1);
 System.Web.HttpContext.Current.Response.Cookies.Add(cookie);
}
</code></pre>
And to load it again :
<pre><code class="hljs language-ini">if (System.Web.HttpContext.Current.Request.Cookies["CountryPreference"] != null)
{
 System.Web.HttpContext.Current.Request.Cookies["CountryPreference"].Expires = DateTime.Now.AddYears(1);
 data.Country = System.Web.HttpContext.Current.Request.Cookies["CountryPreference"].Value;
}
</code></pre>
For some reason the cookie is always null?

I&#39;m looking for a cheat sheet that will allow me to show an HTML designer the equivalent asp.net controls for standard HTML tags.  As an example the &amp;lt;asp:Panel&gt; will render as an HTML &amp;lt;div&gt; and an &amp;lt;asp:Label&gt; will render as an HTML &amp;lt;span&gt;.  I&#39;ve been googling this to no avail.  Can someone post a link to a good cheat sheet so that the designers on this project can understand the markup on the aspx pages more clearly. 

To be clear, I would like a link to a list of major ASP.NET controls, with descriptions as to how they would relate to standard HTML.  It would be great if this were in PDF format or on an easy to read and print web page.  The reason, in my case, would be that we have a PHP developer who is very familiar with HTML coming to work on our project, and I feel it would be useful to have a better understanding of standard ASP.NET server controls if I could hand him such a &quot;cheat sheet&quot;. 

I&#39;m referring mainly to the .NET 2.0 framework, but we are also doing work with 3.0/3.5.




ASP.NET Control to HTML tag equivalent

I&#39;ve been using this piece of code I&#39;ve written and it&#39;s working in this most unclear manner. I wish to insert a row into the database which includes two columns of DateTime:

    myrow.ApprovalDate = DateTime.Now
    myrow.ProposedDate = DateTime.Now

And yet, when I update the database I receive this error:

&gt; SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM. 

I&#39;ve even tried copying an inserted value from the database and hard code it into the object being updated:

    // I copied this value from the DB
    myrow.ApprovalDate =  Convert.ToDateTime(&quot;2008-12-24 00:00:00.000&quot;);

Still same error, the strange part is that the above trick worked for the first insert to the DB but failed from there on. Any ideas what&#39;s going on?

Error - SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM

What is the difference between the controller result named `ViewResult` and `PartialViewResult`? More importantly, when is the `PartialViewResult` used?

ASP.NET MVC ViewResult vs PartialViewResult

I&#39;m setting up a public site and the first thing on my mind is SQL injection. I have some text fields I&#39;m saving and am using linq to update/write to the database. Am I safe using linq? 

This example is creating the user account. 

    Data.MemberRegistrationDataContext context = new MemberRegistrationDataContext();
    Data.tbl_Member_UserProfile profile = new tbl_Member_UserProfile();
    profile.SSN = Convert.ToDecimal(Session[&quot;tempMemberSSN_Registration&quot;]);
    profile.UserName = userName;
    profile.Password = password;
    profile.EmailAddress = email;
    profile.QuestionID = qID;
    profile.QuestionResponse = securityAnswer;
    profile.LastModDt = DateTime.Now;
    profile.LastModBy = &quot;web&quot;;
    context.tbl_Member_UserProfiles.InsertOnSubmit(profile);
    context.SubmitChanges();

This example is changing the password

       MemberRegistrationDataContext dc = new MemberRegistrationDataContext();
       var mProfileRecord = dc.tbl_Member_UserProfiles.Single(c =&gt; c.SSN == sSSN);
       mProfileRecord.Password = sNewPassword;
       dc.SubmitChanges();


Are these safe? Does LINQ parameterize the SQL it generates automatically?


Will using LINQ to SQL help prevent SQL injection

Per [Yahoo&#39;s best practices for high performance web sites][1], I&#39;d like to remove Etags from my headers (I&#39;m manually managing all my caching and have no need for Etags... and when/if I need to scale to a farm, I&#39;d really like them gone).  I&#39;m running IIS7 on Windows Server 2008. Anyone know how I can do this?


  [1]: http://developer.yahoo.com/performance/rules.html

How do I remove eTag headers from IIS7?

What is the &#39;page lifecycle&#39; of an ASP.NET MVC page, compared to ASP.NET WebForms?

I&#39;m tryin to better understand this &#39;simple&#39; question in order to determine whether or not existing pages I have in a (very) simple site can be easily converted from ASP.NET WebForms.

Either a &#39;conversion&#39; of the process below, or an alternative lifecycle would be what I&#39;m looking for.

&lt;u&gt;What I&#39;m currently doing:&lt;/u&gt;

*(yes i know that anyone capable of answering my question already knows all this -- i&#39;m just tryin to get a comparison of the &#39;lifecycle&#39; so i thought i&#39;d start by filling in what we already all know)*

**Rendering the page:**

 * I have a master page which contains my basic template
 * I have content pages that give me named regions from the master page into which I put content.
 * In an event handler for each content page I load data from the database (mostly read-only). 
 * I bind this data to ASP.NET controls representing grids, dropdowns or repeaters. This data all &#39;lives&#39; inside the HTML generated. Some of it gets into ViewState (but I wont go into that too much!)
 * I set properties or bind data to certain items like Image or TextBox controls on the page. 
 * The page gets sent to the client rendered as non-reusable HTML.
 * I try to avoid using ViewState other than what the page needs as a minimum.

**Client side (not using ASP.NET AJAX):**
 
 * I may use JQuery and some nasty tricks to find controls on the page and perform operations on them.
 * If the user selects from a dropdown -- a postback is generated which triggers a C# event in my codebehind. This event may go to the database, but whatever it does a completely newly generated HTML page ends up getting sent back to the client.
 * I may use Page.Session to store key value pairs I need to reuse later


So with MVC how does this &#39;lifecycle&#39; change? 


What is the &#39;page lifecycle&#39; of an ASP.NET MVC page, compared to ASP.NET WebForms?

I have an ASP.NET MVC project containing an AdminController class and giving me URls like these:

&gt;   http://example.com/admin/AddCustomer
&gt;
&gt;    http://examle.com/Admin/ListCustomers

I want to configure the server/app so that URIs containing **/Admin** are only accessible from the 192.168.0.0/24 network (i.e. our LAN)

I&#39;d like to restrict this controller to only be accessible from certain IP addresses.

Under WebForms, /admin/ was a physical folder that I could restrict in IIS... but with MVC, of course, there&#39;s no physical folder. Is this achievable using web.config or attributes, or do I need to intercept the HTTP request to achieve this?







Restrict access to a specific controller by IP address in ASP.NET MVC Beta

I want to output two different views (one as a string that will be sent as an email), and the other the page displayed to a user.

Is this possible in ASP.NET MVC beta?

I&#39;ve tried multiple examples:

**1.** [RenderPartial to String in ASP.NET MVC Beta][1]&lt;br/&gt;

&gt; If I use this example, I receive the &quot;Cannot redirect after HTTP
&gt; headers have been sent.&quot;.

**2.** [MVC Framework: Capturing the output of a view][2]&lt;br/&gt;

&gt; If I use this, I seem to be unable to do a redirectToAction, as it
&gt; tries to render a view that may not exist. If I do return the view, it
&gt; is completely messed up and doesn&#39;t look right at all.

Does anyone have any ideas/solutions to these issues i have, or have any suggestions for better ones?

Many thanks!

Below is an example. What I&#39;m trying to do is create the **GetViewForEmail method**:

    public ActionResult OrderResult(string ref)
    {
        //Get the order
        Order order = OrderService.GetOrder(ref);

        //The email helper would do the meat and veg by getting the view as a string
        //Pass the control name (OrderResultEmail) and the model (order)
        string emailView = GetViewForEmail(&quot;OrderResultEmail&quot;, order);

        //Email the order out
        EmailHelper(order, emailView);
        return View(&quot;OrderResult&quot;, order);
    }



**Accepted answer from Tim Scott (changed and formatted a little by me):**

    public virtual string RenderViewToString(
        ControllerContext controllerContext,
        string viewPath,
        string masterPath,
        ViewDataDictionary viewData,
        TempDataDictionary tempData)
    {
        Stream filter = null;
        ViewPage viewPage = new ViewPage();

        //Right, create our view
        viewPage.ViewContext = new ViewContext(controllerContext, new WebFormView(viewPath, masterPath), viewData, tempData);

        //Get the response context, flush it and get the response filter.
        var response = viewPage.ViewContext.HttpContext.Response;
        response.Flush();
        var oldFilter = response.Filter;

        try
        {
            //Put a new filter into the response
            filter = new MemoryStream();
            response.Filter = filter;

            //Now render the view into the memorystream and flush the response
            viewPage.ViewContext.View.Render(viewPage.ViewContext, viewPage.ViewContext.HttpContext.Response.Output);
            response.Flush();

            //Now read the rendered view.
            filter.Position = 0;
            var reader = new StreamReader(filter, response.ContentEncoding);
            return reader.ReadToEnd();
        }
        finally
        {
            //Clean up.
            if (filter != null)
            {
                filter.Dispose();
            }

            //Now replace the response filter
            response.Filter = oldFilter;
        }
    }


**Example usage**

Assuming a call from the controller to get the order confirmation email, passing the Site.Master location.

    string myString = RenderViewToString(this.ControllerContext, &quot;~/Views/Order/OrderResultEmail.aspx&quot;, &quot;~/Views/Shared/Site.Master&quot;, this.ViewData, this.TempData);


  [1]: http://brightmix.com/blog/how-to-renderpartial-to-string-in-asp-net-mvc/
  [2]: http://mikehadlow.blogspot.com/2008/06/mvc-framework-capturing-output-of-view_05.html

How to render an ASP.NET MVC view as a string?

What is the final/best recommendation for how to serve favicon.ico in ASP.NET MVC?

I am currently doing the following:

* Adding an entry to the **very beginning** of my RegisterRoutes method:

        routes.IgnoreRoute(&quot;favicon.ico&quot;);

* Placing favicon.ico in the root of my application (which is also going to be the root of my domain).

I have two questions:

* Is there no way to put the favicon.ico somewhere other than the root of my application. It&#39;s pretty icky being right there at the same level as `Content` and `Controllers`.
* Is this `IgnoreRoute(&quot;favicon.ico&quot;)` statement sufficient - or should I also do the following as discussed in [a blog post from Phil Haack][1]. I&#39;m not aware of ever having seen a request to favicon.ico in any directory other than the root - which would make this unnecessary (but it&#39;s good to know how to do it).


        routes.IgnoreRoute(&quot;{*favicon}&quot;, new {favicon=@&quot;(.*/)?favicon.ico(/.*)?&quot;});

 


  [1]: http://haacked.com/archive/2008/07/14/make-routing-ignore-requests-for-a-file-extension.aspx

Serving favicon.ico in ASP.NET MVC

I need to keep a session alive for 30 minutes and then destroy it. 

How do I expire a PHP session after 30 minutes?

How can I detect on the server (server-side) whether cookies in the browser are disabled? Is it possible?

**Detailed explanation:** I am processing an HTTP request on the server. I want to set a cookie via the `Set-Cookie` header. I need to know at that time whether the cookie will be set by the client browser or my request to set the cookie will be ignored.

How to detect server-side whether cookies are disabled

I would like to set up a cookie that never expires. Would that even be possible?

     document.cookie = &quot;name=value; expires=date; path=path;domain=domain; secure&quot;;

I don&#39;t want to make the date really large, I am just wondering if there was a value for the expires parameter on the cookie that told it never to expire. 

Thanks.

Javascript Cookie with no expiration date

What are the do&#39;s and don&#39;ts about Cache VS Session VS Cookies?

For example:  
I&#39;m using Session variables a lot and sometimes have problems in a booking-application when users start to order products and then go to lunch and come back some hours later and continue the booking. I store the booking in the session until the user confirms or aborts the booking so I don&#39;t need to talk to the database and handle halfway bookings in the database when users just click the X in the browser and never comes back.

Should I instead use cache or cookies or some combination for this?

(Also when there is some error in the app, the session-object resets itself and I get more problems because of that)

I&#39;m mostly doing desktop-programming and feel I lack lots of knowledge here so anyone who can expand on where to use Cache, Session, Cookies (or db) would be appreciated


**Edit:** From the answers it seems that a combination of DB and cookies is what I want.   

 1. I have to store the booking in the database connected to a session-id  
 2. Store the session-id in a cookie (encrypted). 
 3. Every page load checking the cookie and fetch the booking from the database
 4. I have a clean-up procedure that runs once a week that clears unfinished bookings.

I can&#39;t store the booking as a cookie because then the user can change prices and other sensitive data and I had to validate everything (can&#39;t trust the data).

Have I got it right?


And thanks for great explanations to all of you!

Cache VS Session VS cookies?

Is there any way to automatically handle cookies in .NET with the HttpWebRequest/HttpWebResponse objects? I&#39;m preferably looking for an equivalent to LWP::UserAgent and its behaviour (perl), only in a .NET environment.

Any suggestions or advice? 



Content Type	Original Author	Original Content on Stackoverflow
Question	Craig	View Question on Stackoverflow
Solution 1 - asp.net	Nilesh Deshpande	View Answer on Stackoverflow
Solution 2 - asp.net	Fernando JS	View Answer on Stackoverflow

ASP MVC Cookies not persisting

asp.net Problem Overview

asp.net Solutions

Solution 1 - asp.net

Solution 2 - asp.net

Taking over a project - What should I ask the previous programmer?

Why are multi-dimensional arrays in .NET slower than normal arrays?

Attributions