It is [TryCast:][1]

    Dim x As String = TryCast(y, String)
    If x Is Nothing Then ...


  [1]: https://docs.microsoft.com/en-us/dotnet/visual-basic/language-reference/operators/trycast-operator

Trycast is what you&#39;re looking for.

    Dim x = TryCast(y, String)


TryCast:

    Dim x = TryCast(y, String)
    if (x Is Nothing) ...

Here you go:

C# code:

    var x = y as String;
    if (x == null) ...


VB.NET equivalent:

    Dim x = TryCast(y, String)
    If (x Is Nothing) ...

    Dim x = TryCast(y, [String])

From: http://www.developerfusion.com/tools/convert/csharp-to-vb/

You can use it with `?`:

    TryCast(item, String)?.Substring(10)

It allows you to manage nullable without `if` :)

One if the first things I learned when I started with C# was the most important one. You can decompile any .NET assembly with Reflector or other tools. Many developers are not aware of this fact and most of them are shocked when I show them their source code.

Protection against decompilation is still a difficult task. I am still looking for a fast, easy and secure way to do it. I don&#39;t want to obfuscate my code so my method names will be a,b,c or so. Reflector or other tools should be unable to recognize my application as .NET assembly at all. I know about some tools already but they are very expensive. Is there any other way to protect my applications?

EDIT:

The reason for my question is not to prevent piracy. I only want to stop competitors from reading my code. I know they will and they already did. They even told me so.
Maybe I am a bit paranoid but business rivals reading my code doesn&#39;t make me feel good. 




How can I protect my .NET assemblies from decompilation?

I am trying to run this basic JPA/EJB code:

    public static void main(String[] args){
    		 UserBean user = new UserBean();
    		 user.setId(1);
    		 user.setUserName(&quot;name1&quot;);
    		 user.setPassword(&quot;passwd1&quot;);
    		 em.persist(user);
      }


I get this error:

    javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: com.JPA.Database

Any ideas?

I search on the internet and the reason I found was: 

&gt; This was caused by how you created the objects, i.e. If you set the ID property explicitly. Removing ID assignment fixed it.

But I didn&#39;t get it, what will I have to modify to get the code working?


&quot;detached entity passed to persist error&quot; with JPA/EJB code

What is the equivalent in VB.NET of the C# **As** keyword, as in the following?

    var x = y as String;
    if (x == null) ...


VB.NET equivalent of C# &quot;As&quot;

What is the equivalent in VB.NET of the C# As keyword, as in the following?
<pre><code class="hljs language-ini">var x = y as String;
if (x == null) ...
</code></pre>

I need to capture a key press when my program is not in focus. (ie. &lt;kbd&gt;Ctrl&lt;/kbd&gt;+&lt;kbd&gt;Alt&lt;/kbd&gt;+&lt;kbd&gt;J&lt;/kbd&gt;) and trigger an event in my program.


Thus far i have found this dll that appears to be the correct path&quot;

    [DllImport(&quot;user32.dll&quot;)]private static extern int RegisterHotKey(IntPtr hwnd, int id,int fsModifiers, int vk);
    
    [DllImport(&quot;user32.dll&quot;)] private static extern int UnregisterHotKey(IntPtr hwnd, int id);

Set global hotkeys using C#

I have a project in which I&#39;d like to use some of the .NET 4.0 features but a core requirement is that I can use the System.Data.SQLite framework which is compiled against 2.X. I see mention of this being possible such as [the accepted answer here][1] but I don&#39;t see how to actually achieve this.

When I just try and run my 4.0 project while referencing the 2.X assembly I get:

&gt; *Mixed mode assembly is built against version &#39;v2.0.50727&#39; of the runtime 
&gt; and cannot be loaded in the 4.0 runtime without additional 
&gt; configuration information.*

What &quot;additional configuration&quot; is necessary?

  [1]: https://stackoverflow.com/questions/1609894/how-to-reference-net-4-0-assembly-within-net-3-5-projects

What &#39;additional configuration&#39; is necessary to reference a .NET 2.0 mixed mode assembly in a .NET 4.0 project?

I have attempted to implement a producer/consumer pattern in c#.  I have a consumer thread that monitors a shared queue, and a producer thread that places items onto the shared queue.  The producer thread is subscribed to receive data...that is, it has an event handler, and just sits around and waits for an OnData event to fire (the data is being sent from a 3rd party api).  When it gets the data, it sticks it on the queue so the consumer can handle it. 

When the OnData event does fire in the producer, I had expected it to be handled by my producer thread.  But that doesn&#39;t seem to be what is happening.  The OnData event seems as if it&#39;s being handled on a new thread instead!  Is this how .net always works...events are handled on their own thread?  Can I control what thread will handle events when they&#39;re raised?  What if hundreds of events are raised near-simultaneously...would each have its own thread?


In .NET, what thread will Events be handled in?

This DLL is added by default in Visual Studio 2010 projects. What is this new assembly used for? It does not seem to contain much after looking at it using Reflector and Google does not seem to have much to say about it either.

What is Microsoft.csharp.dll in .NET 4.0

The .NET MemoryStream does not appear to have a .Reset or .Clear method.

I was thinking of using the following code to accomplish this:

    ms.Seek(0, IO.SeekOrigin.Begin)
    ms.SetLength(0)

What is the proper way to clear or reset an existing .NET MemoryStream?


Reset or Clear .NET MemoryStream

I&#39;m wondering why the &#39;partial class&#39; concept even exists in C#/VB.NET. I&#39;m working on an application and we are reading a (actually very good) book relavant to the development platform we are implementing at work. In the book, the author provides a large code base/wrapper around the platform API and explains how he developed it as he teaches different topics about the platform development.

Anyway, long story short - he uses partial classes, all over the place, as a way to fake multiple inheritance in C# (IMO). Why he didn&#39;t just split the classes up into multiple ones and use composition is beyond me. He will have 3 &#39;partial class&#39; files to make up his base class, each w/ 3-500 lines of code... And does this several times in his API.

___Do you find this justifiable?___ If it were me, I&#39;d have followed the S.R.P. and created multiple classes to handle different required behaviors, then created a base class that has instances of these classes as members (e.g. composition). Why did MS even put partial class into the framework? They removed the ability to expand/collapse all code at each scope level in C# (this was allowed in C++) because it was obviously just allowing bad habits - partial class is, IMO, the same thing. ___I guess my question is: Can you explain to me when there would be a legitimate reason ever to use a partial class?___ 

___EDIT: I&#39;m aware that for Web/WinForms there is no other choice. But outside of this? Why didn&#39;t MS just put some different keyword for gluing code-genn&#39;ed classes together? Or is there really a legit design scenario that merits it?___

___I do not mean this to be a rant / war thread. I&#39;m honestly looking to learn something here. When should partial classes be used in code design? Simple question, no need to close___

Thanks

Are C#&#39;s partial classes bad design?

Is there a VB.NET equivalent to the C# `var` keyword? 

I would like to use it to retrieve the result of a LINQ query.


VB.NET equivalent to C# var keyword

How can I read PDF content with the itextsharp with the Pdfreader class. My PDF may include Plain text or Images of  the text.

Reading PDF content with itextsharp dll in VB.NET or C#

I&#39;ve started using try-catch blocks (a bit late, I know!), but now I&#39;m not sure what to do with the exception once I&#39;ve caught it. What should I do?

&lt;!-- language: vb.net --&gt;

    Try
        connection.Open()
        Dim sqlCmd As New SqlCommand(&quot;do some SQL&quot;, connection)
        Dim sqlDa As New SqlDataAdapter(sqlCmd)
        sqlDa.Fill(dt)
    Catch ex As SQLException
        &#39; Ahhhh, what to do now!!!?
    Finally
        connection.Close()
    End Try


I&#39;ve caught an exception!! Now what?

What is the Visual Basic equivalent of the following C# boolean expression?

    data.GetType() == typeof(System.Data.DataView)

Note: The variable `data` is declared as `IEnumerable`.



Content Type	Original Author	Original Content on Stackoverflow
Question	JoelFan	View Question on Stackoverflow
Solution 1 - .Net	Hans Passant	View Answer on Stackoverflow
Solution 2 - .Net	Morten Anderson	View Answer on Stackoverflow
Solution 3 - .Net	Guffa	View Answer on Stackoverflow
Solution 4 - .Net	Alex Essilfie	View Answer on Stackoverflow
Solution 5 - .Net	Oskar Kjellin	View Answer on Stackoverflow
Solution 6 - .Net	Dustin Laine	View Answer on Stackoverflow
Solution 7 - .Net	evanboissonnot	View Answer on Stackoverflow

VB.NET equivalent of C# "As"

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"detached entity passed to persist error" with JPA/EJB code

How can I protect my .NET assemblies from decompilation?

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