`HtmlString` only exists in ASP.NET 4.

`MvcHtmlString` was a compatibility shim added to MVC 2 to support both .NET 3.5 and .NET 4. Now that MVC 3 is .NET 4 only, it&#39;s a fairly trivial subclass of `HtmlString` presumably for MVC 2-&gt;3 for source compatibility.

If you&#39;re ever going to drop back to MVC 2 it might make sense to use `IHtmlString` or `var` for values returned from MVC functions. Alternatively I think you can now just switch to `HtmlString` throughout.

`HtmlString` was only introduced in .Net 4.0.

In ASP.Net 3.5 MVC 2.0, you should use `MvcHtmlString`.  
In .Net 4.0, you should use `HtmlString`. (which is simpler)

MvcHtmlString is used to indicate when a string should not be re-encoded.

See https://stackoverflow.com/questions/2293357/what-is-an-mvchtmlstring-and-when-should-i-use-it

and

https://stackoverflow.com/questions/3331393/what-does-do-in-asp-net-mvc2/3331408#3331408



I was recently comparing the current version of [json2.js][1] with the version I had in my project and noticed a difference in how the function expression was created and self executed.

The code used to wrap an anonymous function in parenthesis and then execute it,

    (function () {
      // code here
    })();

but now it wraps the auto-executed function in parenthesis.

    (function () {
      // code here
    }());

There is a comment by CMS in the accepted answer of [Explain JavaScript’s encapsulated anonymous function syntax][2] that “both: `(function(){})();` and `(function(){}());` are valid.”

I was wondering what the difference is?  Does the former take up memory by leaving around a global, anonymous function?  Where should the parenthesis be located?


  [1]: https://github.com/douglascrockford/JSON-js/blob/master/json2.js
  [2]: https://stackoverflow.com/questions/1634268/explain-javascripts-encapsulated-anonymous-function-syntax

Location of parenthesis for auto-executing anonymous JavaScript functions?

I get this error message:

&gt; ERROR 1217 (23000) at line 40: Cannot
&gt; delete or update a parent row: a
&gt; foreign key constraint fails

... when I try to drop a table:

    DROP TABLE IF EXISTS `area`;

... defined like this:

    CREATE TABLE `area` (
      `area_id` char(3) COLLATE utf8_spanish_ci NOT NULL,
      `nombre_area` varchar(30) COLLATE utf8_spanish_ci NOT NULL,
      `descripcion_area` varchar(100) COLLATE utf8_spanish_ci NOT NULL,
      PRIMARY KEY (`area_id`),
      UNIQUE KEY `nombre_area_UNIQUE` (`nombre_area`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_spanish_ci;

The funny thing is that **I already dropped all other tables** in the schema that have foreign keys against `area`. Actually, the database is empty except for the `area` table.

How can it possibly have child rows if there isn&#39;t any other object in the database? As far as I know, InnoDB doesn&#39;t allow foreign keys on other schemas, does it?

(I can even run a `RENAME TABLE area TO something_else` command :-?)

Bogus foreign key constraint fail

`HtmlString` vs. `MvcHtmlString`

What are the differences bettween those two, or when to prefer one over the other? 

**Edit:**

One thing to prefer `MvcHtmlString` over `HtmlString` is the extension method `IsNullOrEmpty` of `MvcHtmlString`. 

HtmlString vs. MvcHtmlString

<code>HtmlString</code> vs. <code>MvcHtmlString</code>
What are the differences bettween those two, or when to prefer one over the other?
Edit:
One thing to prefer <code>MvcHtmlString</code> over <code>HtmlString</code> is the extension method <code>IsNullOrEmpty</code> of <code>MvcHtmlString</code>.

Certain `System.Threading.Tasks.Task` constructors take a `CancellationToken` as a parameter:

    CancellationTokenSource source = new CancellationTokenSource();
    Task t = new Task (/* method */, source.Token);

What baffles me about this is that there is no way from _inside_ the method body to actually get at the token passed in (e.g., nothing like `Task.CurrentTask.CancellationToken`). The token has to be provided through some other mechanism, such as the state object or captured  in a lambda.

So what purpose does providing the cancellation token in the constructor serve?

Cancellation token in Task constructor: why?

I am having an issue with this test function where I take an in memory string, compress it, and decompress it.  The compression works great, but I can&#39;t seem to get the decompression to work.


    //Compress
    System.IO.MemoryStream outStream = new System.IO.MemoryStream();                
    GZipStream tinyStream = new GZipStream(outStream, CompressionMode.Compress);
    mStream.Position = 0;
    mStream.CopyTo(tinyStream);
        
    //Decompress    
    outStream.Position = 0;
    GZipStream bigStream = new GZipStream(outStream, CompressionMode.Decompress);
    System.IO.MemoryStream bigStreamOut = new System.IO.MemoryStream();
    bigStream.CopyTo(bigStreamOut);

    //Results:
    //bigStreamOut.Length == 0
    //outStream.Position == the end of the stream.

I believe that bigStream out should at least have data in it, especially if my source stream (outStream) is being read. is this a MSFT bug or mine?

How do I use GZipStream with System.IO.MemoryStream?

Hey I have this configuration in my web.config

&lt;!-- language: xml --&gt;

    &lt;log4net&gt;
        &lt;appender name=&quot;LogFileAppender&quot; type=&quot;log4net.Appender.FileAppender&quot;&gt;
            &lt;param name=&quot;File&quot; value=&quot;mylog.log&quot; /&gt;
            &lt;param name=&quot;AppendToFile&quot; value=&quot;true&quot; /&gt;
            &lt;layout type=&quot;log4net.Layout.PatternLayout&quot;&gt;
	            &lt;param name=&quot;Header&quot; value=&quot;&quot; /&gt;
	            &lt;param name=&quot;Footer&quot; value=&quot;&quot; /&gt;
	            &lt;param name=&quot;ConversionPattern&quot; value=&quot;%d [%t] %-5p %m%n&quot; /&gt;
            &lt;/layout&gt;
        &lt;/appender&gt;
        &lt;appender name=&quot;ConsoleAppender&quot; type=&quot;log4net.Appender.ConsoleAppender&quot; &gt;
            &lt;layout type=&quot;log4net.Layout.PatternLayout&quot;&gt;
                &lt;param name=&quot;Header&quot; value=&quot;[Header]\r\n&quot; /&gt;
                &lt;param name=&quot;Footer&quot; value=&quot;[Footer]\r\n&quot; /&gt;
                &lt;param name=&quot;ConversionPattern&quot; value=&quot;%d [%t] %-5p %m%n&quot; /&gt;
            &lt;/layout&gt;
        &lt;/appender&gt;
        &lt;root&gt;
            &lt;level value=&quot;DEBUG&quot; /&gt;
            &lt;appender-ref ref=&quot;LogFileAppender&quot; /&gt;
            &lt;appender-ref ref=&quot;ConsoleAppender&quot; /&gt;
        &lt;/root&gt;
    &lt;/log4net&gt;

but log4net is not working. My project compiles fine, and I get no errors debugging either. The lines where I tell to `log.debug(&quot;somemessage&quot;)` gets run fine, but I can&#39;t find the `mylog.log` file, so where is it?



log4net not working

Trying to build my project on the build server gives me the following error:

    Microsoft (R) Build Engine Version 4.0.30319.1
    error MSB4019: The imported project &quot;C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v10.0\TeamData\Microsoft.Data.Schema.SqlTasks.targets&quot; was not found. Confirm that the path in the &lt;Import&gt; declaration is correct, and that the file exists on disk.
    error MSB4019: The imported project &quot;C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v10.0\WebApplications\Microsoft.WebApplication.targets&quot; was not found. Confirm that the path in the &lt;Import&gt; declaration is correct, and that the file exists on disk.
    error MSB4019: The imported project &quot;C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v10.0\WebApplications\Microsoft.WebApplication.targets&quot; was not found. Confirm that the path in the &lt;Import&gt; declaration is correct, and that the file exists on disk.

I solved this problem a few months ago, with installing Visual Studio 2010 on the Build Server. But now I&#39;m setup a new server from scratch, and I want to know if there any better solution to solve this issue.

Microsoft.WebApplication.targets was not found, on the build server. What&#39;s your solution?

I changed the maxAllowedContentLength to 

    &lt;security&gt;
        &lt;requestFiltering&gt;
            &lt;requestLimits maxAllowedContentLength=&quot;5024000000&quot; /&gt;
        &lt;/requestFiltering&gt;
    &lt;/security&gt;

In my web.config, but when running on IIS7 I get this error:

&gt;The &#39;maxAllowedContentLength&#39; attribute is invalid. Not a valid unsigned integer

![http://i.stack.imgur.com/u1ZFe.jpg][1]

but when I run in the VS server it run normally without any errors.

How to config my website to allow upload files with 500MB size, without this problem on IIS7?

  [1]: http://i.stack.imgur.com/u1ZFe.jpg

How to set the maxAllowedContentLength to 500MB while running on IIS7?

What is the syntax for server side comment in razor view?

I want to comment this code:

    /*
    @helper NavItem() {
      
    }
    */


Razor comment syntax

I am creating a sample ASP.NET MVC 3 site using Razor as view engine. The razor syntax starts with `@` character e.g. `@RenderBody()`. If I write @test on my cshtml page it gives me parse error

&gt; CS0103: The name &#39;test&#39; does not exist in the current context

How do I escape &#39;@&#39; character?

Escape @ character in razor view engine

I have a table with repeating customer rows, I would like to add the customer ID to the ID attribute of my table rows like this:

    &lt;tr id=&quot;row&lt;customer id&gt;&quot;&gt;&lt;/tr&gt;

I try adding this code:

    @foreach(var c in Model) {
       &lt;tr id=&quot;row@c.id&quot;&gt;&lt;/tr&gt;
    }

Which gives me the following output:

    &lt;tr id=&quot;row@c.id&quot;&gt;&lt;/tr&gt;
    &lt;tr id=&quot;row@c.id&quot;&gt;&lt;/tr&gt;

etc.

But I would like it to be:

    &lt;tr id=&quot;row1&quot;&gt;&lt;/tr&gt;
    &lt;tr id=&quot;row2&quot;&gt;&lt;/tr&gt;

etc.

I also tried to add `&lt;tr&gt;row@{c.id}&lt;/tr&gt;` but it did not work..

Razor syntax inside attributes of html elements (ASP MVC 3)

**Important Update: See update 5 at the bottom there is no performance issue in asp.net mvc 3, this is a benchmark issue**


I&#39;ve made a simple hello world project in asp.net mvc2,3 aspx and 3 razor and benchmarked them. What I see is:

    System                  Requests per second
    -------------------------------------------
    asp.net mvc 2 ASPX                     4200
    asp.net mvc 3 Beta 1 ASPX              3200
    asp.net mvc 3 Beta 1 Razor             1700

What&#39;s wrong with razor, it&#39;s so slow?

**Update:**
I&#39;ve redone the test. All 4 test virtual directories uses the same .net 4 integrated mode app pool. All projects are done with add new empty x project and adding 1 page with 1 line text and with no code. all sites are compiled in release mode. My system is windows 7, 4 gb i7 4 cores. I&#39;ve run the test 2 times to warm up iis and these are second run results. apache bench parameters : ab -n100000 -c1000 
results:

    System         Requests per second   CPU Utilization
    ----------------------------------------------------
    asp.net 4                     4780               43%
    mcv 2                         4322               58%
    mvc 3 beta 1 aspx             2324               54%
    mvc 3 beta 1 razor            1615               54%

**Update 2** Scott Guthrie answered in his blog:

&gt; *We haven&#39;t fully optimized MVC3 yet (there is usually a lot of cache tuning we do).  We expect razor to be the same performance as the .aspx view engine before it is finally released.*

    System         Requests per second   CPU Utilization
    ----------------------------------------------------
    mvc 3 rc1 razor               1960               54%
    mvc 3 rc2 razor               2187               54%
    mvc 3 rc2 aspx                4014               58%


**Update 5** all tests done in release mode but, the problem was `debug=&quot;true&quot;` in my web.config file (that also effects release builds), after change it to false, issue fixed. And it&#39;s interesting how it&#39;s effecting only razor templating at this scale. This should be in our mind on deployments.

    System         Requests per second   CPU Utilization
    ----------------------------------------------------
    mvc 3 rc2 razor               3940               58%
    mvc 3 rc2 aspx                4100               58%

Thanks to asp.net mvc team, excellent job!

ASP.NET MVC 3 Razor performance

Is there some sort of magic I need to use to get the namespaces in the `pages/namespaces` element in the webconfig?

    &lt;pages&gt;
        &lt;namespaces&gt;
            &lt;add namespace=&quot;System.Web.Mvc&quot;/&gt;
            &lt;add namespace=&quot;System.Web.Mvc.Ajax&quot;/&gt;
            &lt;add namespace=&quot;System.Web.Mvc.Html&quot;/&gt;
            &lt;add namespace=&quot;System.Web.Routing&quot;/&gt;
            &lt;add namespace=&quot;System.Web.WebPages&quot;/&gt;
            &lt;add namespace=&quot;System.Web.Helpers&quot;/&gt;
            &lt;add namespace=&quot;MyCustomHelpers&quot;/&gt;
        &lt;/namespaces&gt;
    &lt;/pages&gt;

The above just *doesn&#39;t* want to work. I know the namespace is fine because when I put the `@using MyCustomHelpers` at the top of the page it magically works.

This is so that I can get the `Html.SomeFunction()` to work without having to put `@using` at the top of all my pages

Content Type	Original Author	Original Content on Stackoverflow
Question	stacker	View Question on Stackoverflow
Solution 1 - .Net 4.0	Rup	View Answer on Stackoverflow
Solution 2 - .Net 4.0	SLaks	View Answer on Stackoverflow
Solution 3 - .Net 4.0	Rob	View Answer on Stackoverflow

HtmlString vs. MvcHtmlString

.Net 4.0 Problem Overview

.Net 4.0 Solutions

Solution 1 - .Net 4.0

Solution 2 - .Net 4.0

Solution 3 - .Net 4.0

Bogus foreign key constraint fail

Location of parenthesis for auto-executing anonymous JavaScript functions?

Attributions