The equivalent functionality (including the normal locking) is in the [Monitor][1] class. 

    foo.notify() =&gt; Monitor.Pulse(foo)
    foo.notifyAll() =&gt; Monitor.PulseAll(foo)
    foo.wait() =&gt;  Monitor.Wait(foo)

The &lt;code&gt;lock&lt;/code&gt; statement in C# is equivalent to calling `Monitor.Enter` and `Monitor.Exit` with an appropriate try/finally block.

See [my threading tutorial][2] or [Joe Albahari&#39;s one][3] for more details.


  [1]: http://msdn.microsoft.com/en-us/library/system.threading.monitor.aspx
  [2]: http://pobox.com/~skeet/csharp/threads
  [3]: http://www.albahari.com/threading/

I think Wait Handles may work for you. See if [this][1] helps.


  [1]: http://msdn.microsoft.com/en-us/library/ms173179.aspx

I have an Excel spreadsheet with 1 column, 700 rows. I care about every seventh line. I don&#39;t want to have to go in and delete the 6 rows between each row I care about. So my solution was to create another sheet and specify a reference to each cell I want.

    =sheet1!a1
    =sheet1!a8
    =sheet1!a15

But I don&#39;t want to type in each of these formulas ... `100 times.I thought if I selected the three and dragged the box around, it would understand what I was trying to do, but no luck.

Any ideas on how to do this elegantly/efficiently?

Copy every nth line from one sheet to another

I seem to be getting breakpoints from other programmers when checking out code...

Where is the list of breakpoints saved by Visual Studio? In the vbproj file? vbproj.user file? documents and settings? are they meant to be specific to the solution, the project, the user, the computer they are set on?

Thanks!


Where are Visual Studio breakpoints saved?

I am aware that you can lock an object in c# using lock but can you give up the lock and wait for something else to notify you that it&#39;s changed like you can in java with wait and notify?

It seems to me that synchronised and lock in java and c# respectively are synonomous.

C# equivalent to java&#39;s wait and notify?

<p>I am aware that you can lock an object in c# using lock but can you give up the lock and wait for something else to notify you that it's changed like you can in java with wait and notify?</p>
<p>It seems to me that synchronised and lock in java and c# respectively are synonomous.</p>


I&#39;ve often had to load multiple items to a particular record in the database. For example: a web page displays items to include for a single report, all of which are records in the database (Report is a record in the Report table, Items are records in Item table). A user is selecting items to include in a single report via a web app, and let&#39;s say they select 3 items and submit. The process will add these 3 items to this report by adding records to  a table called ReportItems (ReportId,ItemId).

Currently, I would do something like this in in the code:

    public void AddItemsToReport(string connStr, int Id, List&lt;int&gt; itemList)
    {
        Database db = DatabaseFactory.CreateDatabase(connStr);
        
        string sqlCommand = &quot;AddItemsToReport&quot;
        DbCommand dbCommand = db.GetStoredProcCommand(sqlCommand);
        
        string items = &quot;&quot;;
        foreach (int i in itemList)
            items += string.Format(&quot;{0}~&quot;, i);
        
        if (items.Length &gt; 0)
            items = items.Substring(0, items.Length - 1);
        
        // Add parameters
        db.AddInParameter(dbCommand, &quot;ReportId&quot;, DbType.Int32, Id);
        db.AddInParameter(dbCommand, &quot;Items&quot;, DbType.String, perms);
        db.ExecuteNonQuery(dbCommand);
    }

and this in the Stored procedure:

    INSERT INTO ReportItem (ReportId,ItemId)
    SELECT	@ReportId,
    	      Id
    FROM	 fn_GetIntTableFromList(@Items,&#39;~&#39;)

Where the function returns a one column table of integers.

My question is this: is there a better way to handle something like this? Note, I&#39;m not asking about database normalizing or anything like that, my question relates specifically with the code.

Passing List&lt;&gt; to SQL Stored Procedure

I am developing a wizard for a machine that is to be used as a backup of other machines.  When it replaces an existing machine, it needs to set its IP address, DNS, WINS, and host name to match the machine being replaced.

Is there a library in .net (C#) which allows me to do this programatically?

There are multiple NICs, each which need to be set individually.

**EDIT**

Thank you [TimothyP][1] for your example.  It got me moving on the right track and the quick reply was awesome.

Thanks [balexandre][2].  Your code is perfect.  I was in a rush and had already adapted the example TimothyP linked to, but I would have loved to have had your code sooner.

I&#39;ve also developed a routine using similar techniques for changing the computer name.  I&#39;ll post it in the future so subscribe to this questions [RSS feed][3] if you want to be informed of the update.  I may get it up later today or on Monday after a bit of cleanup.


  [1]: https://stackoverflow.com/questions/209779/how-can-you-change-network-settings-ip-address-dns-wins-host-name-with-code-in-c#209822
  [2]: https://stackoverflow.com/questions/209779/how-can-you-change-network-settings-ip-address-dns-wins-host-name-with-code-in-c#209983
  [3]: https://stackoverflow.com/feeds/question/209779 &quot;RSS Feed&quot;

How can you change Network settings (IP Address, DNS, WINS, Host Name) with code in C#

I&#39;m loading an image from a file, and I want to know how to validate the image before it is fully read from the file.

    string filePath = &quot;image.jpg&quot;;
    Image newImage = Image.FromFile(filePath);

The problem occurs when image.jpg isn&#39;t really a jpg.  For example, if I create an empty text file and rename it to image.jpg, an OutOfMemory Exception  will be thrown when image.jpg is loaded.

I&#39;m looking for a function that will validate an image given a stream or a file path of the image.

Example function prototype

    bool IsValidImage(string fileName);
    bool IsValidImage(Stream imageStream);


Validate image from file in C#

I created an ASMX file with a code behind file. It&#39;s working fine, but it is outputting XML.

However, I need it to output JSON. The ResponseFormat configuration doesn&#39;t seem to work. My code-behind is:

    [System.Web.Script.Services.ScriptService]
    public class _default : System.Web.Services.WebService {
        [WebMethod]
        [ScriptMethod(UseHttpGet = true,ResponseFormat = ResponseFormat.Json)]
        public string[] UserDetails()
        {
            return new string[] { &quot;abc&quot;, &quot;def&quot; };
        }
    }



How to let an ASMX file output JSON

What is the purpose of the `Using` block in C#? How is it different from a local variable?

What is the C# Using block and why should I use it?

I&#39;m using NetBeans, trying to change the familiar Java coffee cup icon to a png file that I have saved in a resources directory in the jar file.  I&#39;ve found many different web pages that claim they have a solution, but so far none of them work.

Here&#39;s what I have at the moment (leaving out the try-catch block):

    URL url = new URL(&quot;com/xyz/resources/camera.png&quot;);
    Toolkit kit = Toolkit.getDefaultToolkit();
    Image img = kit.createImage(url);
    getFrame().setIconImage(img);

The class that contains this code is in the **com.xyz** package, if that makes any difference.  That class also extends JFrame.  This code is throwing a MalformedUrlException on the first line.

Anyone have a solution that works?



How do I change the default application icon in Java?

Whats the best practice for setting up package structures in a Java Web Application?

How would you setup your src, unit test code, etc?

Package structure for a Java project?

Should I be writing Doc Comments for all of my java methods? 

Do you use Javadoc for every method you write?

I thought I understood Java generics pretty well, but then I came across the following in java.lang.Enum:

    class Enum&lt;E extends Enum&lt;E&gt;&gt;

Could someone explain how to interpret this type parameter? Bonus points for providing other examples of where a similar type parameter could be used.

Java Enum definition

Anyone know a simple way using Java calendar to subtract X days from a date?

I have not been able to find any function which allows me to directly subtract X days from a date in Java. Can someone point me to the right direction?

How to subtract X days from a date using Java calendar?

I found this [PECL package called threads][1], but there is not a release yet. And nothing is coming up on the PHP website.


  [1]: http://pecl.php.net/package/threads

Does PHP have threading?

Long time ago, I saved a sentence from a Java reference book: *&quot;Java has no mechanism to handle deadlock. it won&#39;t even know deadlock occurred.&quot; (Head First Java 2nd Edition, p.516)*

So, what is about it? Is there a way to catch deadlock case in Java? I mean, is there a way that our code understands a deadlock case occurred?

Deadlock detection in Java

Just wondering what the difference between `BeginInvoke()` and `Invoke()` are? 

Mainly what each one would be used for.

EDIT: What is the difference between creating a threading object and calling invoke on that and just calling `BeginInvoke()` on a delegate? or are they the same thing?

What&#39;s the difference between Invoke() and BeginInvoke()

What is the difference between using a new thread and using a thread from the thread pool? What performance benefits are there and why should I consider using a thread from the pool rather than one I&#39;ve explicitly created? I&#39;m thinking specifically of .NET here, but general examples are fine.

Thread vs ThreadPool

We have a function which a single thread calls into (we name this the main thread). Within the body of the function we spawn multiple worker threads to do CPU intensive work, wait for all threads to finish, then return the result on the main thread.

The result is that the caller can use the function naively, and internally it&#39;ll make use of multiple cores.

*All good so far..*

The problem we have is dealing with exceptions.  We don&#39;t want exceptions on the worker threads to crash the application.  We want the caller to the function to be able to catch them on the main thread.  We must catch exceptions on the worker threads and propagate them across to the main thread to have them continue unwinding from there.

***How can we do this?***

The best I can think of is:

 1. Catch a whole variety of exceptions on our worker threads (std::exception and a few of our own ones).
 2. Record the type and message of the exception.
 3. Have a corresponding switch statement on the main thread which rethrows exceptions of whatever type was recorded on the worker thread.

This has the obvious disadvantage of only supporting a limited set of exception types, and would need modification whenever new exception types were added.

Content Type	Original Author	Original Content on Stackoverflow
Question	Omar Kooheji	View Question on Stackoverflow
Solution 1 - C#	Jon Skeet	View Answer on Stackoverflow
Solution 2 - C#	EBGreen	View Answer on Stackoverflow

C# equivalent to java's wait and notify?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Where are Visual Studio breakpoints saved?

Copy every nth line from one sheet to another

Attributions