    Server.MapPath(&quot;~&quot;);

or:

    HostingEnvironment.ApplicationPhysicalPath 



I have a JavaScript function that looks like this: 

    function UpdateFilterView() {
      if (_extraFilterExists) {
        if ($(&#39;#F_ShowF&#39;).val() == 1) {
          $(&#39;#extraFilterDropDownButton&#39;).attr(&#39;class&#39;, &quot;showhideExtra_up&quot;);
          $(&#39;#extraFilterDropDownButton&#39;).css(&quot;display&quot;, &quot;block&quot;);
          if ($(&#39;#divCategoryFilter&#39;).css(&quot;display&quot;) == &#39;none&#39;) {
            $(&#39;#divCategoryFilter&#39;).show(&#39;slow&#39;);
          }
          return;
        } else {
          if ($(&#39;#divCategoryFilter&#39;).css(&quot;display&quot;) == &#39;block&#39;) {
            $(&#39;#divCategoryFilter&#39;).hide(&#39;slow&#39;);
          }

          $(&#39;#extraFilterDropDownButton&#39;).css(&quot;display&quot;, &quot;block&quot;);
          $(&#39;#extraFilterDropDownButton&#39;).attr(&#39;class&#39;, &quot;showhideExtra_down&quot;);
          return;
        }
      } else {
        if ($(&#39;#divCategoryFilter&#39;).css(&quot;display&quot;) != &#39;none&#39;) {
          $(&#39;#divCategoryFilter&#39;).hide(&#39;fast&#39;);
        }
        $(&#39;#extraFilterDropDownButton&#39;).css(&quot;display&quot;, &quot;none&quot;);
      }
    }

This will be triggered by the following code (from within the `$(document).ready(function () {})`: 

	$(&#39;#extraFilterDropDownButton&#39;).click(function() {
		if ($(&#39;#F_ShowF&#39;).val() == 1) {
			$(&#39;#F_ShowF&#39;).val(0);
		} else {
			$(&#39;#F_ShowF&#39;).val(1);
		}

		UpdateFilterView();
	});

The HTML for this is easy: 

    &lt;div id=&quot;divCategoryFilter&quot;&gt;...&lt;/div&gt; 
    &lt;div style=&quot;clear:both;&quot;&gt;&lt;/div&gt;
    &lt;div id=&quot;extraFilterDropDownButton&quot; class=&quot;showhideExtra_down&quot;&gt;&amp;nbsp;&lt;/div&gt;

I have two problems with this: 

1. When the panel is hidden and we press the div button (`extraFilterDropDownButton`) the upper left part of the page will flicker and then the panel will be animated down.

2. When the panel is shown and we press the div button the panel will `hide(&#39;slow&#39;)`, but the button will not change to the correct class even when we set it in the `UpdateFilterView` script?

The correct class will be set on the button when hovering it, this is set with the following code:

    $(&quot;#extraFilterDropDownButton&quot;).hover(function() {
        if ($(&#39;#divCategoryFilter&#39;).css(&quot;display&quot;) == &#39;block&#39;) {
          $(this).attr(&#39;class&#39;, &#39;showhideExtra_up_hover&#39;);
        } else {
          $(this).attr(&#39;class&#39;, &#39;showhideExtra_down_hover&#39;);
        }
      },
      function() {
        if ($(&#39;#divCategoryFilter&#39;).css(&quot;display&quot;) == &#39;block&#39;) {
          $(this).attr(&#39;class&#39;, &#39;showhideExtra_up&#39;);
        } else {
          $(this).attr(&#39;class&#39;, &#39;showhideExtra_down&#39;);
        }
      });

How can I change the class of an element with jQuery&gt;

Ok, this might be a very noob question, but I find that PHP Documentation on that and several Internet Searches hasn&#39;t give me any idea about that.

&gt; When should I use try-catch blocks to improve my application?

I read someone saying that we should use try-catch blocks only to prevent fatal errors.
I read someone else saying that we should use it only on unexpected errors (wait what? unexpected? if they are unexpected errors how could I prevent them with try-catch? should I put all my application code inside a try block?).
Others simply say that try-catch blocks should be used everywhere because they can be also extended (extending the Exception class).
Finally someone says that PHP try-catch block are totally useless because they are very bad implemented. (On this I found a nice SO question about performance).

It seems to me that this topic is very strange and confused. Could someone lights me up?



When to use Try Catch blocks

I am using dotlesscss for my css and I remember how to use that but what I am forgetting is how to get the root project path so that I can generate the full file path to my .less file to get for the less engine to parse.  How do I get the project root path so that I can generate the path for my less files?

Getting Project Root Path In Controller ASP.NET MVC?

<p>I am using dotlesscss for my css and I remember how to use that but what I am forgetting is how to get the root project path so that I can generate the full file path to my .less file to get for the less engine to parse.  How do I get the project root path so that I can generate the path for my less files?</p>


I am creating a NuGet package for a C# class library, and I would like to include generated Xml Documentation with the library. This is my nuspec file:

``` lang-xml
&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
&lt;package&gt;
  &lt;metadata&gt;
    &lt;id&gt;MyLibrary&lt;/id&gt;
    &lt;version&gt;1.0.0.0&lt;/version&gt;
    &lt;authors&gt;John Nelson&lt;/authors&gt;
    &lt;language&gt;en-US&lt;/language&gt;
    &lt;description&gt;A C# class library&lt;/description&gt;
  &lt;/metadata&gt;
  &lt;files&gt;
    &lt;file src=&quot;..\..\build\MyLibrary.dll&quot; target=&quot;lib\Net40&quot; /&gt;
    &lt;file src=&quot;..\..\build\MyLibrary.xml&quot; target=&quot;lib\Net40&quot; /&gt;
  &lt;/files&gt;
&lt;/package&gt;
```

When I [build the package with this command](http://docs.nuget.org/create/creating-and-publishing-a-package):

    nuget pack MyLibrary.nuspec

It generates an error. If I remove the line:

    &lt;file src=&quot;..\..\build\MyLibrary.xml&quot; target=&quot;lib\Net40&quot; /&gt;

NuGet.exe successfully creates the nupkg. I can even unzip the package, and verify that the contents are correct. What am I doing wrong? Should the xml file go into a different target directory?


How do you include Xml Docs for a class library in a NuGet package?

I can see in MS Docs how to change the file alignment for C# compilation (via project settings and the command line).

I have googled and seen articles explaining that a file alignment of 512 Bytes reduces the size of the .dll.  I have tested myself with different file alignments and seen that, yes, it does.

My question is:

Why would I ever want to use a different file alignement?  There must be scenarios where this is required or there wouldn&#39;t be the option?

Also, what does it do exactly?  The MSDN pages talk about sections?  What are sections?

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/compiler-options/advanced#filealignment


For what reason would I choose a C# compiler file alignment setting other than 512?

I get a byte stream from some web service. This byte stream contains the binary data of an image and I&#39;m using the method in C# below to convert it to an Image instance. 

I need to know what kind of image I&#39;ve got. Is it a simple bitmap (`*.bmp`) or a JPEG image (`*.jpg`) or a png image? 

How can I find it out? 


        public static Image byteArrayToImage( byte[] bmpBytes )
        {
            Image image = null;
            using( MemoryStream stream = new MemoryStream( bmpBytes ) )
            {
                image = Image.FromStream( stream );
            }

            return image;
        }

How can I know what image format I get from a stream?

I have this function in my controller.

    [HttpPost]
    public ActionResult Edit(EmployeesViewModel viewModel)
    {
        Employee employee = GetEmployee(viewModel.EmployeeId);
        TryUpdateModel(employee);

        if (ModelState.IsValid)
        {
            SaveEmployee(employee);
            TempData[&quot;message&quot;] = &quot;Employee has been saved.&quot;;
            return RedirectToAction(&quot;Details&quot;, new { id = employee.EmployeeID });
        }

        return View(viewModel); // validation error, so redisplay same view
    }

It keeps failing, `ModelState.IsValid` keeps returning false and redisplaying the view. But I have no idea what the error is.

Is there a way to get the error and redisplay it to the user?

Get error message if ModelState.IsValid fails?

I have a problem with Entity Framework in ASP.NET. I want to get the Id value whenever I add an object to database. How can I do this?

According to [Entity Framework][1] the solution is:

    using (var context = new EntityContext())
    {
    	var customer = new Customer()
    	{
    		Name = &quot;John&quot;
    	};
    
    	context.Customers.Add(customer);
    	context.SaveChanges();
    		
    	int id = customer.CustomerID;
    }

This doesn&#39;t get the database table identity, but gets the assigned ID of the entity, if we delete a record from the table the seed identity will not match the entity ID.

  [1]: https://entityframework.net/

How can I retrieve Id of inserted entity using Entity framework?

When building a website, when would it be a good idea to use .ascx files?  What exactly is the .ascx and what is it used for?  Examples would help a lot thanks!

when do you need .ascx files and how would you use them?

I have this attribute in my view model:

    [DataType(DataType.DateTime)]
    public DateTime? StartDate { get; set; }

If I want to display the date, or populate a textbox with the date, I have these:

    &lt;%: Model.StartDate %&gt;

    &lt;%: Html.TextBoxFor(m =&gt; m.StartDate) %&gt;

Whenever the date is displayed, it&#39;s displayed like: **01/01/2011 12:00:00 AM**

But I&#39;d like to only display **01/01/2011**

Is there a way to apply a display format with data annotations? I don&#39;t want to have to go to every instance where I display a date, and add some code to format it.

Assign format of DateTime with data annotations?

I can&#39;t seem to find just a basic code sample to see how TryUpdateModel works? When do you use it and why?

When and why do you use TryUpdateModel in asp.net mvc 2?

I&#39;m making an ajax call using jquery to an asp.net mvc controller action:

    [AcceptVerbs(HttpVerbs.Post)]
            public ActionResult GetWeek(string startDay)
            {
                var daysOfWeek = CompanyUtility.GetWeek(User.Company.Id, startDay);
                return Json(daysOfWeek);
            }

When session times out, this call will fail, as the User object is stored in session. I created a custom authorize attribute in order to check if session was lost and redirect to the login page. This works fine for page requests, however it doesn&#39;t work for ajax requests, as you can&#39;t redirect from an ajax request:

    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
        public class AuthorizeUserAttribute : AuthorizeAttribute
        {
            protected override bool AuthorizeCore(HttpContextBase httpContext)
            {
                if (!httpContext.Request.IsAjaxRequest())
                {//validate http request.
                    if (!httpContext.Request.IsAuthenticated
                        || httpContext.Session[&quot;User&quot;] == null)
                    {
                        FormsAuthentication.SignOut();
                        httpContext.Response.Redirect(&quot;~/?returnurl=&quot; + httpContext.Request.Url.ToString());
                        return false;
                    }
                }
                return true;
            }
        }

I read on another thread that when the user isn&#39;t authenticated and you make an ajax request, you should set the status code to 401 (unauthorized) and then check for that in js and redirect them to the login page. However, I can&#39;t get this working:

    protected override void OnActionExecuting(ActionExecutingContext filterContext)
            {
                if (Request.IsAjaxRequest() &amp;&amp; (!Request.IsAuthenticated || User == null))
                {
                    filterContext.RequestContext.HttpContext.Response.StatusCode = 401;
                }
                else
                {
                    base.OnActionExecuting(filterContext);
                }
            }

Basically, it&#39;ll set it to 401, but then it&#39;ll continue into the controller action and throw an object ref not set to an instance of an object error, which then returns error 500 back to the client-side js. If I change my custom Authorize attribute to validate ajax requests as well and return false for those that aren&#39;t authenticated, that makes the ajax request return my login page, which obviously doesn&#39;t work.

How do I get this working?

Handling session timeout in ajax calls

What is difference between `DisplayName` attribute and `Display` attribute in ASP.NET MVC?

displayname attribute vs display attribute

In ASP.NET MVC, what is the difference between:

- `Html.Partial` and `Html.RenderPartial`
- `Html.Action` and `Html.RenderAction`

Html.Partial vs Html.RenderPartial &amp; Html.Action vs Html.RenderAction

Here are four paths:

    p1=r&#39;\foo\bar\foobar.txt&#39;
    p2=r&#39;\foo\bar\foo\foo\foobar.txt&#39;
    p3=r&#39;\foo\bar\foo\foo2\foobar.txt&#39;
    p4=r&#39;\foo2\bar\foo\foo\foobar.txt&#39;

The directories may or may not exist on a drive. What would be the most elegant way to create the directories in each path?

I was thinking about using `os.path.split()` in a loop, and checking for a dir with `os.path.exists`, but I don&#39;t know it there&#39;s a better approach.

Elegant way to make all dirs in a path

Is there an easy way I can print the full path of `file.txt` ?

    file.txt = /nfs/an/disks/jj/home/dir/file.txt

The `&lt;command&gt;` 

    dir&gt; &lt;command&gt; file.txt  

should print
  
    /nfs/an/disks/jj/home/dir/file.txt

How to get full path of a file?

I am getting the following error from Apache

**[Sat Mar 19 23:10:50 2011] [warn] mod_fcgid: stderr: PHP Fatal error:  require_once() [&lt;a href=&#39;function.require&#39;&gt;function.require&lt;/a&gt;]: Failed opening required &#39;/common/configs/config_templates.inc.php&#39; (include_path=&#39;.:/usr/share/pear:/usr/share/php&#39;) in /home/viapics1/public_html/common/configs/config.inc.php on line 158**

I am definately not an expert of Apache but the file config.inc.php &amp; config_templates.inc.php are there. I also tried navigating to a test.html page I placed in common/configs/ so I assume there is no rights issues going on. I also set the rights on config_templates.inc.php to give everyone read, write, and execute rights. Not sure what to do at this point, I checked to see if there was a /usr/share/php directory and I found there was not but when I did yum install php it said it had the latest. Ideas? 


PHP Fatal Error Failed opening required File

By default, OS X 10.6 uses `/usr/libexec/path_helper` to add the following paths listed in the file `/etc/paths`:

    /usr/bin
    /bin
    /usr/sbin
    /sbin
    /usr/local/bin

This means that `/usr/bin` comes before `/usr/local/bin` on the path. This results in the version of [git installed by Xcode 4][so] in `/usr/bin` to be called instead of the version installed by Homebrew into `/usr/local/bin`.

Which leads me to my question, is there a problem with having `/usr/local/bin` come before `/usr/bin` in the path? Is there a specific reason that Apple defaults to having `/usr/bin` come before `/usr/local/bin`?

## How to change order of `/usr/bin` and `/usr/local/bin`

Is it a problem to move `/usr/local/bin` from the bottom of the file `/etc/paths` to the top? Doing so would impact the path for more than just when I fire up Terminal, since `/usr/libexec/path_helper` could be used by other resources (I&#39;m uncertain about this).

While redundant, it seems safer for me to add `/usr/local/bin` to the path in `~/.bash_profile`, which would mean that `/usr/local/bin` would be on the path twice.

[so]: https://stackoverflow.com/q/5364340/95592

Is there a problem with having /usr/local/bin before /usr/bin on the path in OS X?

I want to run a simple one-liner in the Windows CMD prompt to print my `%PATH%` variable, one entry per line.

I tried this: `for /f &quot;delims=;&quot; %a in (&quot;%path%&quot;) do echo %a` but this only prints the first entry:

    Z:\&gt;for /f &quot;delims=;&quot; %a in (&quot;%path%&quot;) do echo %a

    Z:\&gt;echo c:\python25\.
    c:\python25\.

Also as you can see from the output above, this is also printing the `echo %a` command as well as the output. Is there any way to stop this?

If I try a similar command, I get all the entries, but still get the `echo %a` output spamming the results. I don&#39;t understand why the following prints all entries, but my attempt on `%PATH%` doesn&#39;t. I suspect I don&#39;t understand the `/F` switch.

    Z:\&gt;for %a in (1 2 3) do echo %a

    Z:\&gt;echo 1
    1

    Z:\&gt;echo 2
    2

    Z:\&gt;echo 3
    3


Content Type	Original Author	Original Content on Stackoverflow
Question	ryanzec	View Question on Stackoverflow
Solution 1 - C#	Darin Dimitrov	View Answer on Stackoverflow

Getting Project Root Path In Controller ASP.NET MVC?

C# Problem Overview

C# Solutions

Solution 1 - C#

When to use Try Catch blocks

How can I change the class of an element with jQuery>

Attributions