    @Html.CheckBoxFor(
        m =&gt; m.MyModel.MyBoolProperty, 
        new { 
            @class = &quot;myCheckBox&quot;, 
            data_externalid = &quot;23521&quot;
        }
    )

The `_` will automatically be converted to `-` in the resulting markup:

    &lt;input type=&quot;checkbox&quot; name=&quot;MyModel.MyBoolProperty&quot; data-externalid=&quot;23521&quot; class=&quot;myCheckBox&quot; /&gt;

And that&#39;s true for all Html helpers taking a `htmlAttributes` anonymous object as argument, not only the `CheckBoxFor` helper.

I made documentation for my SDK, using Doxygen. It contains the list of files, namespaces, classes, types etc. - everything that I placed as Doxygen comments in the code. Now I want to write some general information about SDK (kind of introduction), which is not related directly to any code element. I want to place this introduction on the documentation start page. How can I do this?

How to make an introduction page with Doxygen

What is the best way to get the root app directory from inside the controller? Is it possible to get it outside of the controller?

Now I get it by passing it (from parameters) to the service as an argument, like this:

    services:
      
        sr_processor:
            class: Pro\Processor
            arguments: [%kernel.root_dir%]

Is there a better, simpler way to get this information in Symfony2?

How to get the root dir of the Symfony2 application?

    @this.Html.CheckBoxFor(m =&gt; m.MyModel.MyBoolProperty, new { @class=&quot;myCheckBox&quot;, extraAttr=&quot;23521&quot;})

With razor, I&#39;m unable to specify values for data- attributes such as `data-externalid=&quot;23521&quot;`

Is there a way to do this using `@this.Html.CheckBoxFor(...)`?




How to specify data attributes in razor, e.g., data-externalid=&quot;23151&quot; on @this.Html.CheckBoxFor(...)

<pre><code class="hljs language-less">@this.Html.CheckBoxFor(m => m.MyModel.MyBoolProperty, new { @class="myCheckBox", extraAttr="23521"})
</code></pre>
With razor, I'm unable to specify values for data- attributes such as <code>data-externalid="23521"</code>
Is there a way to do this using <code>@this.Html.CheckBoxFor(...)</code>?

Recently I was trying for a company ‘x’. They sent me some set of questions and told me to solve only one.
 
The problem is like this -
 
Basic sales tax is applicable at a rate of 10% on all goods, except books, food, and medical products that are exempt.  
Import duty is an additional sales tax applicable on all imported goods at a rate of 5%, with no exemptions. 

When I purchase items I receive a receipt which lists the name of all the items and their price (including tax), finishing with the total cost of the items, and the total amounts of sales taxes paid.  
The rounding rules for sales tax are that for a tax rate of n%, a shelf price of p contains (np/100 rounded up to the nearest 0.05) amount of sales tax.

“They told me, they are interested in the **Design Aspect** of your solution and would like to evaluate my **Object Oriented Programming Skills**.”

This is what they told in their own words

 - For the solution, we would want you use either Java, Ruby or C#.
 - We are interested in the DESIGN ASPECT of your solution and would like to evaluate your **Object Oriented Programming Skills**.
 - You may use external libraries or tools for building or testing purposes. Specifically, you may use unit testing libraries or build tools available for your chosen language (e.g., JUnit, Ant, NUnit, NAnt, Test::Unit, Rake etc.)
 - Optionally, you may also include a brief explanation of your design and assumptions along with your code.
 - Kindly note that we are NOT expecting a web-based application or a comprehensive UI. Rather, we are expecting a simple, console based application and interested in your source code.
 
So I provided below code – you can just copy paste code and run in VS.
 
    class Program
     {
         static void Main(string[] args)
         {
             try
             {
                 double totalBill = 0, salesTax = 0;
                 List&lt;Product&gt; productList = getProductList();
                 foreach (Product prod in productList)
                 {
                     double tax = prod.ComputeSalesTax();
                     salesTax += tax;
                     totalBill += tax + (prod.Quantity * prod.ProductPrice);
                     Console.WriteLine(string.Format(&quot;Item = {0} : Quantity = {1} : Price = {2} : Tax = {3}&quot;, prod.ProductName, prod.Quantity, prod.ProductPrice + tax, tax));
                 }
                 Console.WriteLine(&quot;Total Tax : &quot; + salesTax);
                 Console.WriteLine(&quot;Total Bill : &quot; + totalBill);                
            }
             catch (Exception ex)
             {
                 Console.WriteLine(ex.Message);
             }
             Console.ReadLine();
         }
 
        private static List&lt;Product&gt; getProductList()
         {
             List&lt;Product&gt; lstProducts = new List&lt;Product&gt;();
             //input 1
             lstProducts.Add(new Product(&quot;Book&quot;, 12.49, 1, ProductType.ExemptedProduct, false));
             lstProducts.Add(new Product(&quot;Music CD&quot;, 14.99, 1, ProductType.TaxPaidProduct, false));
             lstProducts.Add(new Product(&quot;Chocolate Bar&quot;, .85, 1, ProductType.ExemptedProduct, false));
 
            //input 2
             //lstProducts.Add(new Product(&quot;Imported Chocolate&quot;, 10, 1, ProductType.ExemptedProduct,true));
             //lstProducts.Add(new Product(&quot;Imported Perfume&quot;, 47.50, 1, ProductType.TaxPaidProduct,true));
 
            //input 3
             //lstProducts.Add(new Product(&quot;Imported Perfume&quot;, 27.99, 1, ProductType.TaxPaidProduct,true));
             //lstProducts.Add(new Product(&quot;Perfume&quot;, 18.99, 1, ProductType.TaxPaidProduct,false));
             //lstProducts.Add(new Product(&quot;Headache Pills&quot;, 9.75, 1, ProductType.ExemptedProduct,false));
             //lstProducts.Add(new Product(&quot;Imported Chocolate&quot;, 11.25, 1, ProductType.ExemptedProduct,true));
             return lstProducts;
         }
     }
 
    public enum ProductType
     {
         ExemptedProduct=1,
         TaxPaidProduct=2,
         //ImportedProduct=3
     }
 
    class Product
     {
         private ProductType _typeOfProduct = ProductType.TaxPaidProduct;
         private string _productName = string.Empty;
         private double _productPrice;
         private int _quantity;
         private bool _isImportedProduct = false;
 
        public string ProductName { get { return _productName; } }
         public double ProductPrice { get { return _productPrice; } }
         public int Quantity { get { return _quantity; } }
 
        public Product(string productName, double productPrice,int quantity, ProductType type, bool isImportedProduct)
         {
             _productName = productName;
             _productPrice = productPrice;
             _quantity = quantity;
             _typeOfProduct = type;
             _isImportedProduct = isImportedProduct;
         }
 
        public double ComputeSalesTax()
         {
             double tax = 0;
             if(_isImportedProduct) //charge 5% tax directly
                 tax+=_productPrice*.05;
             switch (_typeOfProduct)
             {
                 case ProductType.ExemptedProduct: break;
                 case ProductType.TaxPaidProduct:
                     tax += _productPrice * .10;
                     break;
             }
             return Math.Round(tax, 2);
             //round result before returning
         }
     }
 
you can uncommnet input and run for different inputs.
 
I provided the solution but I was rejected.
 
&quot;They said, they are unable to consider me for our current open positions because code solution is not satisfactory.&quot;
 
Please guide me what is missing here. Is this solution is not a good OOAD solution.  
How can I improve my OOAD skills.  
My seniors also says perfect OOAD application will also not work practically.
 
Thanks

How to create the perfect OOP application

How can I change below code, to each time get 50 different random data from database?

    return (from examQ in idb.Exam_Question_Int_Tbl
          where examQ.Exam_Tbl_ID==exam_id
          select examQ).OrderBy(x=&gt;x.Exam_Tbl_ID).Take(50);



linq: order by random

&gt; **Possible Duplicate:**  
&gt; [How do you convert epoch time in C#?](https://stackoverflow.com/questions/2883576/how-do-you-convert-epoch-time-in-c)  

&lt;!-- End of automatically inserted text --&gt;

I&#39;m trying to figure out how to get the epoch time in C#. Similar to the timestamps given on this website: http://www.epochconverter.com/

Does DateTime have a method for that?

How do I get epoch time in C#?

During the Techdays here in the Netherlands Steve Sanderson gave a presentation about [*C#5, ASP.NET MVC 4, and asynchronous Web*.][1] 

He explained that when requests take a long time to finish, all the threads from the threadpool become busy and new requests have to wait. The server can&#39;t handle the load and everything slows down.

He then showed how the use of async webrequests improves performance because the work is then delegated to another thread and the threadpool can respond quickly to new incoming requests. He even demoed this and showed that 50 concurrent requests first took 50 * 1s but with the async behavior in place only 1,2 s in total.

But after seeing this I still have some questions.

1. **Why can&#39;t we just use a bigger threadpool? Isn&#39;t using async/await to bring up another thread slower then just increasing the threadpool from the start? It&#39;s not like the server we run on suddenly get more threads or something?** 

2. **The request from the user is still waiting for the async thread to finish. If the thread from the pool is doing something else, how is the &#39;UI&#39; thread kept busy? Steve mentioned something about &#39;a smart kernel that knows when something is finished&#39;. How does this work?**


  [1]: http://channel9.msdn.com/Events/TechDays/Techdays-2012-the-Netherlands/2287

Why use async requests instead of using a larger threadpool?

I need to calculate the similarity between 2 strings. So what exactly do I mean? Let me explain with an example:

 - The real word: `hospital`
 - Mistaken word: `haspita`

Now my aim is to determine how many characters I need to modify the mistaken word to obtain the real word. In this example, I need to modify 2 letters. So what would be the percent? I take the length of the real word always. So it becomes 2 / 8 = 25% so these 2 given string DSM is 75%.

How can I achieve this with performance being a key consideration?

How to calculate distance similarity measure of given 2 strings?

I have a dictionary of values Eg &quot;Name&quot;: &quot;Alex&quot;

Is there a way to pass this to Dapper as arguments for a query?

Here is an example showing what I want to do.

    IDictionary&lt;string, string&gt; args = GetArgsFromSomewhere();
    string query = &quot;select * from people where Name = @Name&quot;;
    var stuff = connection.Query&lt;ExtractionRecord&gt;(query, args);

How to create arguments for a Dapper query dynamically

Many methods in the .Net library are implemented in native code. Those that come from the framework itself are marked with `[MethodImpl(MethodImplOptions.InternalCall)]`. Those that come from some unmanaged DLL are marked with `[DllImport]` (e.g. `[DllImport(&quot;kernel32.dll&quot;)]`). So far nothing unusual.

But while writing [answer for another question](https://stackoverflow.com/a/9491084/41071), I discovered there are many methods marked with `[DllImport(&quot;QCall&quot;)]`. They seem to be internal implementation of .Net (e.g. `GC._Collect()`).

My question is: What exactly does `[DllImport(&quot;QCall&quot;)]` mean? What is the difference between `[DllImport(&quot;QCall&quot;)]` and `[MethodImpl(MethodImplOptions.InternalCall)]`?

What is [DllImport(&quot;QCall&quot;)]?

I want to view the folders and sub folders in [GAC][1]. Also want to know about adding and removing from [GAC][1].

   

To install we write this lines in command prompt by opening  `Visual Studio command prompt`:-

 `gacutil /i [assembly path]`

But to uninstall we need only:-

  `gacutil /u [assembly name]`

Why?


  [1]: https://en.wikipedia.org/wiki/Global_Assembly_Cache

How to view the Folder and Files in GAC?

Could someone give me a bit more information on the difference between `Culture` and `UICulture` within the .NET framework? What they do and when to use what?

What is the difference between Culture and UICulture?

I am trying to generate emails with HTML content.  this content has already gone through sanitation so I am not worried in that regard, however when I call:

    Razor.Parse(template, model);

on the following Razor template:

    &lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0 Transitional//EN&quot;&gt;
    &lt;html&gt;
    	&lt;body&gt;
            @(new System.Web.HtmlString(Model.EmailContent))
    	&lt;/body&gt;
    &lt;/html&gt;

the email that is outputted is HTMl encoded, but I need it decoded.  How can I accomplish this?

How do I output raw html when using RazorEngine (NOT from MVC)

I’m fairly new at C# and MVC and have used lambdas on certain occasions, such as for anonymous methods and on LINQ.

Usually I see lambda expressions that look something like this:

    (x =&gt; x.Name), (x =&gt; { Console.WriteLine(x))

I understand that lambda = &quot;goes to&quot;. I have never seen a lambda expression where the left parameter is not used.

I don’t know how to translate this lambda expression though

    @Html.DisplayFor(modelItem =&gt; item.FirstName)

Can anyone shed some light on this one for me? Shouldn’t this be 

    (modelItem =&gt; modelItem.FirstName)?

I got this from Microsoft&#39;s [Introduction to ASP.NET MVC tutorial](http://www.asp.net/mvc/tutorials/mvc-5/introduction/accessing-your-models-data-from-a-controller).

I want to understand the lambda expression in @Html.DisplayFor(modelItem =&gt; item.FirstName)

I&#39;m iterating a `List&lt;T&gt;` in a razor foreach loop in my view which renders a partial. In the partial I&#39;m rendering a single record for which I want to have 4 in a row in my view. I have a css class for the two end columns so need to determine in the partial whether the call is the 1st or the 4th record. What is the best way of identifying this in my partial to output the correct code?

This is my main page which contains the loop:

    @foreach (var myItem in Model.Members){

            //if i = 1
            &lt;div class=&quot;grid_20&quot;&gt;
            &lt;!-- Start Row --&gt;

            //is there someway to get in for i = 1 to 4 and pass to partial?
            @Html.Partial(&quot;nameOfPartial&quot;, Model)

            //if i = 4 then output below and reset i to 1
            &lt;div class=&quot;clear&quot;&gt;&lt;/div&gt;
            &lt;!-- End Row --&gt;
            &lt;/div&gt;

    }

I figure I can create a int that I can update on each pass and render the text no problem here but it&#39;s passing the integer value into my partial I&#39;m more concerned about. Unless there&#39;s a better way.

Here is my partial:

    @{
    switch()
    case 1:
            &lt;text&gt;
            &lt;div class=&quot;grid_4 alpha&quot;&gt;
            &lt;/text&gt;
    break;
    case 4:
            &lt;text&gt;
            &lt;div class=&quot;grid_4 omega&quot;&gt;
            &lt;/text&gt;
    break;
    default:
            &lt;text&gt;
            &lt;div class=&quot;grid_4&quot;&gt;
            &lt;/text&gt;
    break;
    }
    
            &lt;img src=&quot;Content/960-grid/spacer.gif&quot; style=&quot;width:130px; height:160px; background-color:#fff; border:10px solid #d3d3d3;&quot; /&gt;
            &lt;p&gt;&lt;a href=&quot;member-card.html&quot;&gt;@Model.Name&lt;/a&gt;&lt;br/&gt;
            @Model.Job&lt;br/&gt;
            @Model.Location&lt;/p&gt;
    &lt;/div&gt;

Not sure if I&#39;m having a blonde day today and this is frightfully easy but I just can&#39;t think of the best way to pass the int value in. Hope someone can help.

Getting index value on razor foreach

Is it possible to do the following from a javascript file in an MVC application?

    $(function(){
       alert(@ViewBag.someValue);
    }

Currently it throws the error:

&gt; reference to undefined XML name @ViewBag

Possible to access MVC ViewBag object from Javascript file?

I have the following view,, which create 10 ajax.beginform ,, But the problem that i am facing is that incase an error occurs during the creation of the object then the ModelState.AddModelError will not be shown on the view although i have set the `@Html.ValidationSummary(true)`
The view looks as follow
   
    @model Medical.Models.VisitLabResult
        
    @for (int item = 0; item &lt; 10; item++)
    {
        &lt;tr id = @item&gt;
        @using (Ajax.BeginForm(&quot;CreateAll&quot;, &quot;VisitLabResult&quot;, new AjaxOptions
        {
            HttpMethod = &quot;Post&quot;,
            UpdateTargetId = item.ToString() + &quot;td&quot;,
            InsertionMode = InsertionMode.Replace,
            LoadingElementId = &quot;progress2&quot;,
            OnSuccess = string.Format(
                &quot;disableform({0})&quot;,
                Json.Encode(item)),
        }))
        {  
            @Html.ValidationSummary(true)
        
            @Html.AntiForgeryToken()
            &lt;td&gt;
                @Html.DropDownList(&quot;LabTestID&quot;, String.Empty)
                @Html.ValidationMessageFor(model =&gt; model.LabTestID)
            &lt;/td&gt;
            &lt;td&gt;
                @Html.EditorFor(model =&gt; model.Result)
                @Html.ValidationMessageFor(model =&gt; model.Result)
            &lt;/td&gt;
        
            &lt;td&gt;
                @Html.EditorFor(model =&gt; model.DateTaken)
                @Html.ValidationMessageFor(model =&gt; model.DateTaken)
            &lt;/td&gt;
        
            &lt;td&gt;
                @Html.EditorFor(model =&gt; model.Comment)
                @Html.ValidationMessageFor(model =&gt; model.Comment)
            &lt;/td&gt;
        
            &lt;td&gt;
                &lt;input type=&quot;submit&quot; value=&quot;Create&quot; /&gt;
            &lt;/td&gt;

            &lt;td id = @(item.ToString() + &quot;td&quot;)&gt;
            &lt;/td&gt;
        }
        &lt;/tr&gt;
        }
    &lt;/table&gt;

And my action method which defines the ModelState.AddModelError looks as follow:-

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult CreateAll(VisitLabResult vlr, int visitid = 28)
    {
        try
        {
            if (ModelState.IsValid)
            {
                var v = repository.GetVisit(visitid);
                if (!(v.EligableToStart(User.Identity.Name))){ 
                    return View(&quot;NotFound&quot;); 
                }
                vlr.VisitID = visitid;
                repository.AddVisitLabResult(vlr);
                repository.Save();
                      
                return Content(&quot;Addedd Succsfully&quot;);
            }
        }
        catch (DbUpdateException)
        {
            JsonRequestBehavior.AllowGet);
            ModelState.AddModelError(string.Empty, &quot;The Same test Type might have been already created,, go back to the Visit page to see the avilalbe Lab Tests&quot;);
        }
    }

**So how i can show the ModelState.AddModelError on my view.**



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

How to specify data attributes in razor, e.g., data-externalid="23151" on @this.Html.CheckBoxFor(...)

C# Problem Overview

C# Solutions

Solution 1 - C#

How to get the root dir of the Symfony2 application?

How to make an introduction page with Doxygen

Attributions