     [DebuggerStepThrough]


([docs](https://docs.microsoft.com/en-us/dotnet/api/system.diagnostics.debuggerstepthroughattribute?view=netframework-4.7))

Not forgetting to add:

    using System.Diagnostics;

It&#39;s written `&lt;DebuggerStepThrough&gt;` in ***VB.NET***.

To use it just put on top of the method like :

&lt;!-- language: lang-vb --&gt;

    &lt;DebuggerStepThrough&gt;
    Private Sub form_Paint(sender As Object, e As PaintEventArgs) Handles form.Paint
         &#39; Picasso
    End Sub

Okay, this may be a dumb question, but I&#39;ve not been able to find any information on it.

Are String.Empty and string.Empty the same?  I always find myself gravitating towards using the upper case version (String.Empty) because I prefer the color and look of it in my IDE than the lower case version (string.Empty)...

Is there a &quot;correct&quot; way to use these that differ or is it entirely down to personal preference?  It was my assumption that they&#39;re both the same, but to be honest, I never gave it any thought until for whatever reason today I wondered &quot;If they both exist, they must both exist for a reason&quot;.

*Is* there a reason that anyone knows of?  If so, what is it?  Can anyone enlighten me?

P.S.  The &quot;exact duplicates&quot; only answer half of the question - &quot;which is right?&quot;, not the &quot;why do they both exist?&quot;


----------

**Exact Duplicate**: [https://stackoverflow.com/questions/7074/in-c-what-is-the-difference-between-string-and-string][1]

**Exact Duplicate**: [https://stackoverflow.com/questions/215255/string-vs-string-in-c][2]



  [1]: https://stackoverflow.com/questions/7074/in-c-what-is-the-difference-between-string-and-string
  [2]: https://stackoverflow.com/questions/215255/string-vs-string-in-c

Why do lowercase and uppercase versions of string exist and which should I use?

I have a fixed width DIV containing a table with many columns, and need to allow the user to scroll the table horizontally within the DIV.

This needs to work on IE6 and IE7 only (internal client application).

The following works in IE7:

    overflow-x: scroll;

Can anyone help with a solution that works in IE6 as well?

Div with horizontal scrolling only

Is there an attribute I can use on a method so that when stepping through some code in Debug mode the Debugger stays on the outside of the method?


Attribute to Skip over a Method while Stepping in Debug Mode

<p>Is there an attribute I can use on a method so that when stepping through some code in Debug mode the Debugger stays on the outside of the method?</p>


What is the most preferred and easiest way to do pagination in ASP.NET MVC?  I.e. what is the easiest way to break up a list into several browsable pages.

As an example lets say I get a list of elements from a database/gateway/repository like this:

    public ActionResult ListMyItems()
    {
        List&lt;Item&gt; list = ItemDB.GetListOfItems();
        ViewData[&quot;ItemList&quot;] = list;

        return View();
    }

For simplicity&#39;s sake I&#39;d like to specify just a page number for my action as parameter. Like this:

    public ActionResult ListMyItems(int page)
    {
       //...
    }

How do I do pagination in ASP.NET MVC?

Ran across this line of code:

    FormsAuth = formsAuth ?? new FormsAuthenticationWrapper();

What do the two question marks mean, is it some kind of ternary operator?
It&#39;s hard to look up in Google.

What do two question marks together mean in C#?

I have to perform the following SQL query:

    select answer_nbr, count(distinct user_nbr)
    from tpoll_answer
    where poll_nbr = 16
    group by answer_nbr

The LINQ to SQL query 

    from a in tpoll_answer 
    where a.poll_nbr = 16 select a.answer_nbr, a.user_nbr distinct 

maps to the following SQL query:

    select distinct answer_nbr, distinct user_nbr
    from tpoll_answer
    where poll_nbr = 16

So far, so good. However the problem raises when trying to GROUP the results, as I&#39;m not being able to find a LINQ to SQL query that maps to the first query I wrote here (thank you [LINQPad][1] for making this process a lot easier). The following is the only one that I&#39;ve found that gives me the desired result:

    from answer in tpoll_answer where answer.poll_nbr = 16 _
    group by a_id = answer.answer_nbr into votes = count(answer.user_nbr)

Which in turns produces the follwing ugly and non-optimized at all SQL query:

    SELECT [t1].[answer_nbr] AS [a_id], (
        SELECT COUNT(*)
        FROM (
            SELECT CONVERT(Bit,[t2].[user_nbr]) AS [value], [t2].[answer_nbr], [t2].[poll_nbr]
            FROM [TPOLL_ANSWER] AS [t2]
            ) AS [t3]
        WHERE ([t3].[value] = 1) AND ([t1].[answer_nbr] = [t3].[answer_nbr]) AND ([t3].[poll_nbr] = @p0)
        ) AS [votes]
    FROM (
        SELECT [t0].[answer_nbr]
        FROM [TPOLL_ANSWER] AS [t0]
        WHERE [t0].[poll_nbr] = @p0
        GROUP BY [t0].[answer_nbr]
        ) AS [t1]
    -- @p0: Input Int (Size = 0; Prec = 0; Scale = 0) [16]
    -- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 3.5.30729.1

Any help will be more than appreciated.

  [1]: http://www.linqpad.net/

LINQ to SQL using GROUP BY and COUNT(DISTINCT)

In C# is there a way to detect if a string is all caps?

Most of the strings will be short(ie under 100 characters)

Detecting if a string is all CAPS

So I came across some code this morning that looked like this:

    try
    {
        x = SomeThingDangerous();
        return x;
    }
    catch (Exception ex)
    {
        throw new DangerousException(ex);
    }
    finally
    {
        CleanUpDangerousStuff();
    }

Now this code compiles fine and works as it should, but it just doesn&#39;t feel right to return from within a try block, especially if there&#39;s an associated finally.

My main issue is what happens if the finally throws an exception of it&#39;s own? You&#39;ve got a returned variable but also an exception to deal with... so I&#39;m interested to know what others think about returning from within a try block?

Is it bad practice to return from within a try catch finally block?

I have programmed with WPF for more than a year. When I started there weren&#39;t so many examples and guidelines to follow, now the situation is much more better.

I would like to ask you some help in listing the best WPF (open) source code examples or projects that you suggest to study in order to learn more about project structure, best practices, etc.

Thank you,
Marco



Best WPF open source projects

`msiexec` is command prompt software that installs an [MSI][1] program. But I have found that you can install an MSI file from the command line by just typing in the name of the MSI file on the command line.

But in order to uninstall the MSI file, it seems you have to call the `msiexec` program and give it a `/x` or `/uninstall`.

How can I uninstall an MSI from the command line without using the `msiexec` routine?

  [1]: http://en.wikipedia.org/wiki/Windows_Installer


Uninstalling an MSI file from the command line without using msiexec

So I have a generic list, and an `oldIndex` and a `newIndex` value.

I want to move the item at `oldIndex`, to `newIndex`...as simply as possible.

Any suggestions?

Note
----
The item should be end up between the items at `(newIndex - 1)` and `newIndex` *before* it was removed.

Generic List - moving an item within the list

So this seems pretty basic but I can&#39;t get it to work.  I have an Object, and I am using reflection to get to it&#39;s public properties.  One of these properties is static and I&#39;m having no luck getting to it.

    Public Function GetProp(ByRef obj As Object, ByVal propName as String) as PropertyInfo
        Return obj.GetType.GetProperty(propName)
        
    End Function

The above code works fine for Public Instance properties, which up until now is all that I have needed.  Supposedly I can use BindingFlags to request other types of properties (private, static), but I can&#39;t seem to find the right combination.

    Public Function GetProp(ByRef obj As Object, ByVal propName as String) as PropertyInfo
        Return obj.GetType.GetProperty(propName, Reflection.BindingFlags.Static Or Reflection.BindingFlags.Instance Or Reflection.BindingFlags.Public)
        
    End Function

But still, requesting any Static members return nothing.  .NET reflector can see the static properties just fine, so clearly I am missing something here.

How to get a Static property with Reflection

I have a class that handles events from a WinForms control. Based on what the user is doing, I am deferencing one instance of the class and creating a new one to handle the same event. I need to unsubscribe the old instance from the event first - easy enough. I&#39;d like to do this in a non-proprietary manner if possible, and it seems like this is a job for IDisposable. However, most documentation recommends IDisposable only when using unmanaged resources, which does not apply here.

If I implement IDisposable and unsubscribe from the event in Dispose(), am I perverting its intention? Should I instead provide an Unsubscribe() function and call that?


----------


**Edit:** Here&#39;s some dummy code that kind of shows what I&#39;m doing (using IDisposable). My actual implementation is related to some proprietary data binding (long story).

    class EventListener : IDisposable
    {
        private TextBox m_textBox;

        public EventListener(TextBox textBox)
        {
            m_textBox = textBox;
            textBox.TextChanged += new EventHandler(textBox_TextChanged);
        }

        void textBox_TextChanged(object sender, EventArgs e)
        {
            // do something
        }

        public void Dispose()
        {
            m_textBox.TextChanged -= new EventHandler(textBox_TextChanged);
        }
    }

    class MyClass
    {
        EventListener m_eventListener = null;
        TextBox m_textBox = new TextBox();

        void SetEventListener()
        {
            if (m_eventListener != null) m_eventListener.Dispose();
            m_eventListener = new EventListener(m_textBox);
        }
    }

In the actual code, the &quot;EventListener&quot; class is more involved, and each instance is uniquely significant. I use these in a collection, and create/destroy them as the user clicks around.


----------
**Conclusion**

I&#39;m accepting [gbjbaanb&#39;s answer][1], at least for now. I feel that the benefit of using a familiar interface outweighs any possible downside of using it where no unmanaged code is involved (how would a user of this object even know that?).

If anyone disagrees - please post/comment/edit. If a better argument can be made against IDisposable, then I&#39;ll change the accepted answer.


  [1]: https://stackoverflow.com/questions/452281/using-idisposable-to-unsubscribe-events#452321

Using IDisposable to unsubscribe events

&gt; **Possible Duplicate:**  
&gt; [JavaScript data formatting/pretty printer](https://stackoverflow.com/questions/130404/javascript-data-formatting-pretty-printer)  

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

I am getting a bit tired of looking at unformatted json blobs in FireBug. 

Does anyone know an equivalent to PHP&#39;s print_r() for jQuery?


Something that would recursively make a display string from an object or array, that I could display on the page for quick debugging?

Thanks!

jQuery: print_r() display equivalent?

I&#39;ve got a simple console project where I&#39;m reading two Excel-files. The Excel-files are included in the project (&quot;add existing item&quot;) and I&#39;ve marked them with &quot;Copy to Output Directory&quot;. However, they are not copied to the debug-directory when debugging/running the code. 

I feel like I&#39;ve forgotten something trivial. What do I need to do more?

Copy always to output directory does not work

This is a follow up to [this question][1], where I didn&#39;t get any input on this point. Here is the brief question:

**Is it possible to detect and debug problems coming from multi-threaded code?**

Often we have to tell our customers: &quot;We can&#39;t reproduce the problem here, so we can&#39;t fix it. Please tell us the steps to reproduce the problem, then we&#39;ll fix it.&quot; It&#39;s a somehow nasty answer if I know that it is a multi-threading problem, but mostly I don&#39;t. How do I get to know that a problem is a multi-threading issue and how to debug it?

I&#39;d like to know if there are any special logging frameworks, or debugging techniques, or code inspectors, or anything else to help solving such issues. General approaches are welcome. If any answer should be language related then keep it to .NET and Java.

  [1]: https://stackoverflow.com/questions/493311/how-to-write-safe-correct-multi-threaded-code-in-net

How to detect and debug multi-threading problems?

OK, *[info break][1]* lists the breakpoints, but not in a format that would work well with reusing them using the --command [as in this question][2]. Does GDB have a method for dumping them into a file acceptable for input again?  Sometimes in a debugging session, it is necessary to restart GDB after building up a set of breakpoints for testing.

The .gdbinit file has the same problem as --command. The *info break* command does not list commands, but rather a table for human consumption.

To elaborate, here is a sample from *info break*:

&lt;pre&gt;
(gdb) info break
Num Type           Disp Enb Address    What
1   breakpoint     keep y   0x08048517 &amp;lt;foo::bar(void)+7&amp;gt;
&lt;/pre&gt;

  [1]: https://sourceware.org/gdb/onlinedocs/gdb/Set-Breaks.html
  [2]: https://stackoverflow.com/questions/500967/gdb-breakpoints



Getting GDB to save a list of breakpoints

Is there any gcc option I can set that will give me the line number of the segmentation fault?

I know I can:

 1. Debug line by line
 2. Put printfs in the code to narrow down.

Edits:

 1. `bt` / `where` on gdb give No stack.
 2. [Helpful suggestion][1]


  [1]: https://stackoverflow.com/a/77336/24874

Line number of segmentation fault

I&#39;ve been trying to use decimal values as params for a field attribute but I get a compiler error.

I found this blog post [link][1] saying it wasn&#39;t possible in .NET to use then, does anybody know why they choose this or how can I use decimal params?


  [1]: http://salamakha.com/blog/2007/09/21/decimal-in-c-attributes/

use decimal values as attribute params in c#?

This would appear to imply &quot;no&quot;. Which is unfortunate.

    [AttributeUsage(AttributeTargets.Interface | AttributeTargets.Class,
     AllowMultiple = true, Inherited = true)]
    public class CustomDescriptionAttribute : Attribute
    {
        public string Description { get; private set; }

        public CustomDescriptionAttribute(string description)
        {
            Description = description;
        }
    }

    [CustomDescription(&quot;IProjectController&quot;)]
    public interface IProjectController
    {
        void Create(string projectName);
    }

    internal class ProjectController : IProjectController
    {
        public void Create(string projectName)
        {
        }
    }

    [TestFixture]
    public class CustomDescriptionAttributeTests
    {
        [Test]
        public void ProjectController_ShouldHaveCustomDescriptionAttribute()
        {
            Type type = typeof(ProjectController);
            object[] attributes = type.GetCustomAttributes(
                typeof(CustomDescriptionAttribute),
                true);

            // NUnit.Framework.AssertionException:   Expected: 1   But was:  0
            Assert.AreEqual(1, attributes.Length);
        }
    }

Can a class inherit attributes from an interface? Or am I barking up the wrong tree here?


Can a C# class inherit attributes from its interface?

I&#39;m using a custom attribute inherited from an attribute class. I&#39;m using it like this:

    [MyCustomAttribute(&quot;CONTROL&quot;)]
    [MyCustomAttribute(&quot;ALT&quot;)]
    [MyCustomAttribute(&quot;SHIFT&quot;)]
    [MyCustomAttribute(&quot;D&quot;)]
    public void setColor()
    {
    
    }

But the &quot;Duplicate &#39;MyCustomAttribute&#39; attribute&quot; error is shown.  
How can I create a duplicate allowed attribute?

How to create duplicate allowed attributes

I have a Java library I&#39;m considering porting to C#.  The Java library makes extensive use of annotations (at both build time and run time.)

I&#39;ve never used C# attributes, but understand that they are the rough equivalent of Java annotations.

If I proceed with the port using attributes to replace annotations, what do I need to know?  What&#39;s going to be the same?  Different?  What&#39;s going to bite me?


What are the similarities and differences between Java Annotations and C# Attributes?

Question based on [MSDN example](https://web.archive.org/web/20170228051218/https://msdn.microsoft.com/en-us/library/aa288454(VS.71).aspx).

Let&#39;s say we have some C# classes with HelpAttribute in standalone desktop application. Is it possible to enumerate all classes with such attribute? Does it make sense to recognize classes this way? Custom attribute would be used to list possible menu options, selecting item will bring to screen instance of such class. Number of classes/items will grow slowly, but this way we can avoid enumerating them all elsewhere, I think.

Content Type	Original Author	Original Content on Stackoverflow
Question	BuddyJoe	View Question on Stackoverflow
Solution 1 - C#	Andrew Rollings	View Answer on Stackoverflow
Solution 2 - C#	Ben	View Answer on Stackoverflow
Solution 3 - C#	BaSsGaz	View Answer on Stackoverflow

Attribute to Skip over a Method while Stepping in Debug Mode

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Div with horizontal scrolling only

Why do lowercase and uppercase versions of string exist and which should I use?

Attributions