    string uriPath =
        &quot;file:\\C:\\Users\\john\\documents\\visual studio 2010\\Projects\\proj&quot;;
    string localPath = new Uri(uriPath).LocalPath;

Try This

    ImagePath = &quot;http://localhost/profilepics/abc.png&quot;;
       HttpWebRequest request = (HttpWebRequest)WebRequest.Create(ImagePath);
              HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                Stream receiveStream = response.GetResponseStream();

             

I solved the same error with the Path.Combine(MapPath()) to get the physical file path instead of the http:/// www one.


         string ImagePath = &quot;&quot;;
     
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(ImagePath);
            string a = &quot;&quot;;
            try
            {
                HttpWebResponse response = (HttpWebResponse)request.GetResponse(); 
                Stream receiveStream = response.GetResponseStream();
                if (receiveStream.CanRead)
                { a = &quot;OK&quot;; }
            }
           
            catch { }

What&#39;s the difference between two asterisks instead of one asterisk when we refer to paths?

Earlier I was debugging my Spring 3 project. I was trying to add a .swf using

`&lt;spring:url var=&quot;flashy&quot; value=&quot;/resources/images/flash.swf&quot;/&gt;`

With my web.xml&#39;s ResourceServlet looking like

    &lt;servlet-name&gt;Resource Servlet &lt;/servlet-name&gt;
    &lt;url-pattern&gt;/resources/*&lt;/url-pattern&gt;

But unfortunately I was getting this error: 

`WARN org.springframework.js.resources.ResourceServlet - An attempt to access a protected resource at /images/flash.swf was disallowed.`

I found it really strange since all my images in the `images` folder were accessed but how come my  .swf was &quot;protected&quot;?

Afterwards, I decided to change the `/resources/*` to `/resources/**` and it finally worked. My question is... why?

Spring: Difference of /** and /* with regards to paths

And if this is possible, what is the syntax for this?

Is it possible to mark a test as pending in MiniTest?

I have an absolute local path pointing to a dir: `&quot;file:\\C:\\Users\\john\\documents\\visual studio 2010\\Projects\\proj&quot;`

But when I try to throw it into `DirectoryInfo`&#39;s ctor I get the &quot;URI formats are not supported&quot; exception.

I googled and looked on SO, but I only see solutions with remote paths, not local ones. I&#39;d expect a conversion method of some sort...

Exception: &quot;URI formats are not supported&quot;

I have an absolute local path pointing to a dir: <code>"file:\\C:\\Users\\john\\documents\\visual studio 2010\\Projects\\proj"</code>
But when I try to throw it into <code>DirectoryInfo</code>'s ctor I get the "URI formats are not supported" exception.
I googled and looked on SO, but I only see solutions with remote paths, not local ones. I'd expect a conversion method of some sort...

Is it possible in C# to explicitly convert a base class object to one of it&#39;s derived classes? Currently thinking I have to create a constructor for my derived classes that accept a base class object as a parameter and copy over the property values. I don&#39;t really like this idea, so I&#39;d like to avoid it if possible.

This doesn&#39;t seem like it should work (object is instantiated as new base, so memory shouldn&#39;t be allocated for extra members of the derived class) but C# seems to allow me to do it:

    class BaseClass
    {
      ... some stuff ...
    }

    class DerivedClass : BaseClass
    {
    	public bool MyDerivedProperty{ get; set; }
    }


    static void Main(string[] args)
    {
    	BaseClass myBaseObject = new BaseClass();
    	DerivedClass myDerivedObject = myBaseObject as DerivedClass;
	
    	myDerivedObject.MyDerivedProperty = true;
    }

Convert base class to derived class

    double[][] ServicePoint = new double[10][9]; // &lt;-- gives an error (1)
    double[,] ServicePoint = new double[10,9]; // &lt;-- ok (2)

What&#39;s their difference? *(1)* yields an error, what&#39;s the reason?

And

    double d = new double[9]
    ServicePoint[0] = d;

using *(2)* will prompt an error. Why?

Multidimensional Array [][] vs [,]

I have a C# program that needs to dispatch a thread every X minutes, *but only if the previously dispatched thread (from X minutes) ago is not currently still running*. 

A plain old `Timer` alone will not work (because it dispatches an event every X minutes regardless or whether or not the previously dispatched process has finished yet).

The process that&#39;s going to get dispatched varies wildly in the time it takes to perform it&#39;s task - sometimes it might take a second, sometimes it might take several hours. I don&#39;t want to start the process again if it&#39;s still processing from the last time it was started. 

Can anyone provide some working C# sample code?

C# run a thread every X minutes, but only if that thread is not running already

Instead of doing this, I want to make use of `string.format()` to accomplish the same result:

    if (myString.Length &lt; 3)
    {
        myString =  &quot;00&quot; + 3;
    }




Format string to a 3 digit number

**How do I break out of an [parallel.for][1] loop?**

I have a pretty complex statement which looks like the following: 

    Parallel.ForEach&lt;ColorIndexHolder&gt;(ColorIndex.AsEnumerable(),
        new Action&lt;ColorIndexHolder&gt;((ColorIndexHolder Element) =&gt;
        {
            if (Element.StartIndex &lt;= I &amp;&amp; Element.StartIndex + Element.Length &gt;= I)
            {
                Found = true;
                break;
            }
        }));


Using parallel class, I can optimize this process by far. However; I cannot figure out how to break the parallel loop? The `break;` statement throws following syntax error: 

&gt; No enclosing loops out of which to break or continue

  [1]: http://msdn.microsoft.com/en-us/library/system.threading.tasks.parallel.for.aspx

Break parallel.foreach?

I&#39;ve been looking to find a CLEAN solution to completely and ultimately remove Visual Studio 2010 from my computer. When you install Visual Studio, it also installs a bunch of programs (about 55) in the add/remove programs panel (`appwiz.cpl`). 

I&#39;ve already tried a small utility made by Microsoft but it does almost nothing. 

I&#39;m really looking now for a better way to uninstall any version of Microsoft Visual Studio. 
Because I have a lot of computers, I&#39;m often switching to a version or another or I just decide that I don&#39;t need it anymore on one computer to get back some space.

Really, what&#39;s the best solution? If there isn&#39;t one, why haven&#39;t Microsoft developed one that is actually working well?

How to completely uninstall Visual Studio 2010?

I seem to be having some trouble wrapping my head around the idea of a Generic List of Generic Lists in C#. I think the problem stems form the use of the `&lt;T&gt;` argument, which I have no prior experience playing with. Could someone provide a short example of declaring a class which is a List, that therein contains another List, but where the type of the object contained therein is not immediately known?

I&#39;ve been reading through the MS documentation on Generics, and I am not immediately sure if I can declare a `List&lt;List&lt;T&gt;&gt;`, nor how exactly to pass the `&lt;T&gt;` parameter to the inside list.

Edit: Adding information

Would declaring a `List&lt;List&lt;T&gt;&gt;` be considered legal here? In case you are wondering, I am building a class that allows me to use a `ulong` as the indexer, and (hopefully) steps around the nasty 2GB limit of .Net by maintaining a List of Lists.  

    public class DynamicList64&lt;T&gt;
        {
            private List&lt;List&lt;T&gt;&gt; data = new List&lt;List&lt;T&gt;&gt;();
    
            private ulong capacity = 0;
            private const int maxnumberOfItemsPerList = Int32.MaxValue;
    
            
    
            public DynamicList64()
            {
                data = new List&lt;List&lt;T&gt;&gt;();
            } 

    

Creating a List of Lists in C#

[Thread.Sleep][1] doesn&#39;t seem to be supported in .NET for Windows Store apps. 

For example, this

    System.Threading.Thread.Sleep(1000);

will compile when targeting any .NET Framework (2.0, 3.5, 4.0, 4.5), but not when targeting .NET for Windows Store apps (or in a portable class library which targets both 4.5 and store).

System.Threading.Thread is still there, it just doesn&#39;t have the Sleep method.


I need to delay something for a few seconds in my app, is there a suitable replacement? 

EDIT why the delay is needed: My app is a game and the delay is to make it look like the computer opponent is &quot;thinking&quot; about his next move. The method is already called asynchronously (main thread isn&#39;t blocked), I just want to slow the response time down.


  [1]: http://msdn.microsoft.com/en-us/library/d00bd51t.aspx

Thread.Sleep replacement in .NET for Windows Store

I am trying to figure out what the maximum number of parameters a method in C# can have. I&#39;ve checked everywhere for an answer, including the C# official documentation, MSDN, and a couple of CLR references and I can&#39;t find an answer. Does anyone have an answer to this question?

What is the maximum number of parameters that a C# method can be defined as taking?

I am implementing a custom collection implementation that can either be readonly or non-readonly; that is, all the methods that change the collection call a function that is the moral equivalent of:

    private void ThrowIfReadOnly() {
        if (this.isReadOnly)
           throw new SomeException(&quot;Cannot modify a readonly collection.&quot;);
    }

I am not sure which of `NotSupportedException` or `InvalidOperationException` I should use in that case.

When to use InvalidOperationException or NotSupportedException?

IIS has an annoying feature for low traffic websites where it recycles unused worker processes, causing the first user to the site after some time to get an extremely long delay (30+ seconds).

I&#39;ve been looking for a solution to the problem and I&#39;ve found these potential solutions.

A. [Use the Application Initialization plugin][1]

B. [Use Auto-Start with .NET 4][2]

C. [Disable the idle-timeout (under IIS Reset)][3]

D. [Precompile the site][4]

I&#39;m wondering which of these is preferred, and more importantly, why are there so many solutions to the same problem? (My guess is they aren&#39;t, and I&#39;m just not understanding something correctly).

**Edit**

Performing **C** seems to be enough to keep my site warmed up, but I&#39;ve discovered that the real root of my site&#39;s slowness has to do with Entity Framework, which I can&#39;t seem to figure out why it&#39;s going cold. See [this][5] question, which &lt;s&gt;unfortunately hasn&#39;t been answered yet&lt;/s&gt; has been answered!

I eventually just had to make a [warm up script](http://social.technet.microsoft.com/wiki/contents/articles/4641.write-an-iis-warm-up-script-for-a-sharepoint-intranet-site-en-us.aspx) to hit my site occasionally to make sure it stayed speedy.


  [1]: http://forums.iis.net/t/1176740.aspx
  [2]: http://weblogs.asp.net/scottgu/archive/2009/09/15/auto-start-asp-net-applications-vs-2010-and-net-4-0-series.aspx
  [3]: https://stackoverflow.com/a/8808855/1080891
  [4]: http://msdn.microsoft.com/en-us/library/ms228015%28v=vs.85%29.aspx
  [5]: https://stackoverflow.com/q/13250679/1080891

Fixing slow initial load for IIS

May someone please explain what a Tuple is and how to use it in a Real World Scenario. I would like to find out how this can enrich my coding experience?

What and When to use Tuple?

I have this code:


    public class MyClass
    {
        public int X { get; set; }
        public int Y { get; set; }

        private Lazy&lt;int&gt; lazyGetSum = new Lazy&lt;int&gt;(new Func&lt;int&gt;(() =&gt; X + Y));
        public int Sum{ get { return lazyGetSum.Value; } }

    }

Gives me this error:

&gt; A field initializer cannot reference the non-static field, method, or
&gt; property.


I think it is very reasonable to access a non-static member via lazy, how to do this?


*** EDIT ***

The accepted answer solves the problem perfectly, but to see the detailed and in-depth -as always- reason of the problem you can read [Joh Skeet&#39;s answer][1].


  [1]: https://stackoverflow.com/a/14029456/283787

Accessing a non-static member via Lazy&lt;T&gt; or any lambda expression

I am creating a simple wpf desktop application. UI have just a button and code in .cs file like.

    private void Button_Click_2(object sender, RoutedEventArgs e)
    {
        FunctionA();
    }

    public void FunctionA()
    {
        Task.Delay(5000).Start();
        MessageBox.Show(&quot;Waiting Complete&quot;);
    }

But surprisingly line `Task.Delay(5000).Start();` is throwing an `InvalidOperationException`: 

&gt;Start may not be called on a promise-style task. 

Can any one help why it is like this?

Start may not be called on a promise-style task. exception is coming

What is difference between .NET framework 4.0 `MemoryCache` vs `ObjectCache`?
Where to use which object?

Content Type	Original Author	Original Content on Stackoverflow
Question	Howie	View Question on Stackoverflow
Solution 1 - C#	Marc Gravell	View Answer on Stackoverflow
Solution 2 - C#	Hardeep Singh	View Answer on Stackoverflow
Solution 3 - C#	Robert Peter Bronstein	View Answer on Stackoverflow
Solution 4 - C#	Badr Bouaichi	View Answer on Stackoverflow

Exception: "URI formats are not supported"

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Solution 4 - C#

Is it possible to mark a test as pending in MiniTest?

Spring: Difference of /** and /* with regards to paths

Attributions