The application pool will restart and session state will be lost. Imagine each ASP.NET application (as defined in IIS) is a program on the desktop. Saving web.config will do something similar to closing the program and reopening it.

1. Yes. It will be recycled.
2. Yes. They will lose their session.
3. Yes. You can safely edit the file. I suggest you to read this MSDN article : [Working with web.config Files in Windows SharePoint Services][1]


  [1]: http://msdn.microsoft.com/en-us/library/ms868619.aspx

Also if Session state is configured as out-of-process (database or service) then recycling the app pool *won&#39;t* lose any session state. This is as true for Sharepoint as it is for vanilla ASP.Net.

When you edit the web.config, It will restart the AppDomain (NOT AppPool) of that web application and clears the all occupied resources and memory. So other web applications running under that App Pool will not be affected. Also it will clear the sessions (in-proc) and memory cache.

As already mentioned by some people: the application pool of the site in IIS will restart (this typically takes a couple of seconds). As a result the next page request(s) will be slower (since nothing will be cached anymore). Also the session state of the users will be lost; BUT in WSS session state is not used by default, in MOSS it is used by InfoPath Form Services. So it could be that you don&#39;t have big issues related to losing session state.

On the other side; to overcome those issues: what is typically done is to create a SharePoint Solution (WSP) that deploys and starts a Timer Job to make the changes to the web.config from code (using the SPWebConfigModification class of the Object Model). The nice thing is that you can schedule the execution of the change, so your users won&#39;t notice it.

I was playing around with my own Sudoku solver and was looking for some pointers to good and fast design when I came across this:

    def r(a):i=a.find(&#39;0&#39;);~i or exit(a);[m
    in[(i-j)%9*(i/9^j/9)*(i/27^j/27|i%9/3^j%9/3)or a[j]for
    j in range(81)]or r(a[:i]+m+a[i+1:])for m in&#39;%d&#39;%5**18]
    from sys import*;r(argv[1])

My own implementation solves Sudokus the same way I solve them in my head but how does this cryptic algorithm work?

[http://scottkirkwood.blogspot.com/2006/07/shortest-sudoku-solver-in-python.html][1]

  [1]: http://scottkirkwood.blogspot.com/2006/07/shortest-sudoku-solver-in-python.html

Shortest Sudoku Solver in Python - How does it work?

I&#39;ve tried this:


    string newScript = textBox1.Text;
    HtmlElement head = browserCtrl.Document.GetElementsByTagName(&quot;head&quot;)[0];
    HtmlElement scriptEl = browserCtrl.Document.CreateElement(&quot;script&quot;);
    lblStatus.Text = scriptEl.GetType().ToString();
    scriptEl.SetAttribute(&quot;type&quot;, &quot;text/javascript&quot;);
    head.AppendChild(scriptEl);
    scriptEl.InnerHtml = &quot;function sayHello() { alert(&#39;hello&#39;) }&quot;;

scriptEl.InnerHtml and scriptEl.InnerText both give errors:

    System.NotSupportedException: Property is not supported on this type of HtmlElement.
       at System.Windows.Forms.HtmlElement.set_InnerHtml(String value)
       at SForceApp.Form1.button1_Click(Object sender, EventArgs e) in d:\jsight\installs\SForceApp\SForceApp\Form1.cs:line 31
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message&amp; m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message&amp; m)
       at System.Windows.Forms.ButtonBase.WndProc(Message&amp; m)
       at System.Windows.Forms.Button.WndProc(Message&amp; m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message&amp; m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message&amp; m)
       at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Is there an easy way to inject a script into the dom?

How to inject Javascript in WebBrowser control?

I need to edit the web.config file on a live Sharepoint environment, but I&#39;m unsure what will happen if I do (I want to output custom errors).

Will this cause the IIS6 worker process to recycle?

Will active users lose their session state because of this?

Or can I safely edit the file?

What happens when I edit web.config?

I need to edit the web.config file on a live Sharepoint environment, but I'm unsure what will happen if I do (I want to output custom errors).
Will this cause the IIS6 worker process to recycle?
Will active users lose their session state because of this?
Or can I safely edit the file?

What do you use to validate an email address on a ASP.NET form. I want to make sure that it contains no XSS exploits.

This is ASP.NET 1.1

Email Address Validation for ASP.NET

Can I create a Controller that simply returns an image asset?

I would like to route this logic through a controller, whenever a URL such as the following is requested:

    www.mywebsite.com/resource/image/topbanner

The controller will look up `topbanner.png` and send that image directly back to the client.

I&#39;ve seen examples of this where you have to create a View - I don&#39;t want to use a View. I want to do it all with just the Controller.

Is this possible?


Can an ASP.NET MVC controller return an Image?

I&#39;d like to use the newer `&lt;button&gt;` tag in an ASP.NET website which, among other things, allows CSS-styled text and embedding a graphic inside the button. The asp:Button control renders as `&lt;input type=&quot;button&quot;&gt;`, is there any way to make a preexisting control render to `&lt;button&gt;`?

From what I&#39;ve read there is an incompatibility with IE posting the button&#39;s markup instead of the value attribute when the button is located within a `&lt;form&gt;`, but in ASP.NET it will be using the onclick event to fire __doPostBack anyway, so I don&#39;t think that this would be a problem.

Are there any reasons why I shouldn&#39;t use this? If not, how would you go about supporting it with asp:Button, or a new server control based on it? I would prefer to not write my own server control if that can be avoided.


----------


At first the `&lt;button runat=&quot;server&quot;&gt;` solution worked, but I immediately ran into a situation where it needs to have a CommandName property, which the HtmlButton control doesn&#39;t have. It looks like I&#39;m going to need to create a control inherited from Button after all. 

What do I need to do in order to override the render method and make it render what I want?


----------

**UPDATE**

DanHerbert&#39;s reply has made me interested in finding a solution to this again, so I&#39;ve spent some more time working on it. 

First, there&#39;s a far easier way of overloading the TagName:

    public ModernButton() : base(HtmlTextWriterTag.Button)
    {
    }

The problem with Dan&#39;s solution as it stands is the innerhtml of the tag is placed into the value property, which causes a validation error on postback. A related problem is, even if you render the value property correctly, IE&#39;s braindead implementation of the `&lt;button&gt;` tag posts the innerhtml instead of the value anyway. So, any implementation of this needs to override the AddAttributesToRender method in order to correctly render the value property, and also provide some sort of workaround for IE so it doesn&#39;t completely screw up the postback.

The IE problem may be insurmountable if you want to take advantage of the CommandName/CommandArgument properties for a databound control. Hopefully someone can suggest a workaround for this.

I have made progress on the rendering:

[ModernButton.cs](http://gist.github.com/69841)

This renders as a proper html `&lt;button&gt;` with the correct value, but it doesn&#39;t work with the ASP.Net PostBack system. I&#39;ve written some of what I need to provide the `Command` event, but it doesn&#39;t fire.

When inspecting this button side-by-side with a regular asp:Button, they look the same other than the differences I need. So I&#39;m not sure how ASP.Net is wiring up the `Command` event in this case.

An additional problem is, nested server controls aren&#39;t rendered (as you can see with the ParseChildren(false) attribute). It&#39;s pretty easy to inject literal html text into the control during render, but how do you allow support for nested server controls?

How can I use the button tag with ASP.NET?

On an ASP.NET website, are static classes unique to each web request, or are they instantiated whenever needed and GCed whenever the GC decides to disposed of them?

The reason I ask is because I&#39;ve written some static classes before in C# and the behavior is different than I would have expected. I would have expected static classes to be unique to each request, but it doesn&#39;t seem like that is the case.

If they are not unique to each request, is there a way to allow them to be?

**UPDATE:**  
The answer driis gave me was exactly what I needed. I was already using a singleton class, however it was using a static instance and therefore was being shared between requests even if the users were different which in this case was a bad thing. Using `HttpContext.Current.Items` solves my problem perfectly. For anyone who stumbles upon this question in the future, here is my implementation, simplified and shortened so that it easy to understand the pattern:

    using System.Collections;
    using System.Web;
    
    public class GloballyAccessibleClass
    {
        private GloballyAccessibleClass() { }
        
        public static GloballyAccessibleClass Instance
        {
            get
            {
                IDictionary items = HttpContext.Current.Items;
                if(!items.Contains(&quot;TheInstance&quot;))
                {
                    items[&quot;TheInstance&quot;] = new GloballyAccessibleClass();
                }
                return items[&quot;TheInstance&quot;] as GloballyAccessibleClass;
            }
        }
    }


Are static class instances unique to a request or a server in ASP.NET?

Anyone know of a link to a good article/tutorial for getting started using jQuery for AJAX calls rather than ASP.NET AJAX? I&#39;m trying to avoid using UpdatePanels entirely in this app, which I haven&#39;t been able to accomplish in the past.

Using jQuery for AJAX with ASP.NET Webforms

Let&#39;s have a list of some good interview questions for SharePoint developers. Please provide one question per entry, and if possible, the answers.

Also, please feel free to suggest corrections if the provided answers are wrong.

I will go first: 

Q: How does SharePoint store pages?

A: [How-to-locate-sharepoint-document-library-source-page-on-the-server?][1]


  [1]: https://stackoverflow.com/questions/125805/how-to-locate-sharepoint-document-library-source-page-on-the-server#127138

SharePoint interview questions

Is there a way to get SharePoint to display code snippets in a pre-formatted way?

Currently if you insert any code, it just looks exactly like the rest of the text. Anything would be better than nothing.

Displaying code snippets in Sharepoint wiki

How do you programmatically upload a file to a document library in sharepoint?

I am currently making a Windows application using C# that will add documents to a document library list.


How do you upload a file to a document library in sharepoint?

I have an ASP.Net page with a C# code behind.

However, I&#39;ve been asked to not use a code behind - so that it will be easier to deploy in SharePoint. 

Is there a way to include the C# code in the ASP.Net page, without using a separate code behind file?

ASP.net page without a code behind

I got a job offer today for a position as a SharePoint developer. One of my friends is telling me that sharepoint is a big mess and not something I would want to be doing.

What are some of your experiences/thoughts in working with SharePoint?

How good/bad is sharepoint programming?

By default, IIS6 does not serve .json (no wildcard `MIME` type).

Therefore a 404 not found is thrown. I then add a new MIME type `(.json, text/plain or application/x-javascript or application/json)` which works fine.

However, when you then add a new mapping `(Home Directory -&gt; Configuration -&gt; Add) with .json, C:\WINDOWS\system32\inetsrv\asp.dll`, &quot;`GET,POST`&quot; and try to browse to the file, you get a 404. 

If you remove the mapping and try and `POST or GET` to it, you get a `405`.

...

Suggestions?

Get IIS6 to serve JSON files (inc. POST,GET)?

This question relates to an ASP.NET website, originally developed in VS 2005 and now in VS 2008.

This website uses two unmanaged external DLLs which are not .NET and I do not have the source code to compile them and have to use them as is.

This website runs fine from within Visual Studio, locating and accessing these external DLLs correctly. However, when the website is published on a webserver (runnning IIS6 and ASP.NET 2.0) rather than the development PC it cannot locate and access these external DLLs, and I get the following error:

`Unable to load DLL &#39;XYZ.dll&#39;: The specified module could not be found. (Exception from HRESULT: 0x8007007E)`

The external DLLs are located in the bin directory of the website, along with the managed DLLs that wrap them and all the other DLLs for the website.

Searching this problem reveals that many other people seem to have the same problem accessing external non.NET DLLs from ASP.NET websites, but I haven&#39;t found a solution that works.
 
I have tried the following:

  * Running DEPENDS to check the dependencies to establish that the first three
    are in System32 directory in the path, the last is in the .NET 2
    framework.
  * I put the two DLLs and their dependencies in
    System32 and rebooted the server, but website still
    couldn&#39;t load these external DLLs.
  * Gave full rights to ASPNET, IIS_WPG and IUSR (for that server) to
    the website bin directory and rebooted, but website still couldn&#39;t
    load these external DLLs.
  * Added the external DLLs as existing items to the projects and set
    their &quot;Copy to Output&quot; property to &quot;Copy Always&quot;, and website
    still can&#39;t find the DLLs.
  * Also set their &quot;Build Action&quot; property to &quot;Embedded resource&quot; and
    website still can&#39;t find the DLLs.

Any assistance with this problem would be greatly appreciated!

Unmanaged DLLs fail to load on ASP.NET server

In a old site, I was changing the way that CustomErrors works by adding `redirectMode=&quot;ResponseRewrite&quot;` (new in 3.5 SP1):

    &lt;customErrors mode=&quot;RemoteOnly&quot; defaultRedirect=&quot;Error.aspx&quot; redirectMode=&quot;ResponseRewrite&quot;&gt;
        &lt;error statusCode=&quot;404&quot; redirect=&quot;404.aspx&quot; /&gt;
    &lt;/customErrors&gt; 

The thing is: it shows me the generic error page (the one that you get when you don&#39;t set `customErrors`.  If I remove the`redirectMode=&quot;ResponseRewrite&quot;` part, it works fine.

I&#39;m sure 3.5 SP1 is installed in the server, because I use the same setting on other sites hosted in the same server.

Any ideas?

CustomErrors does not work when setting redirectMode=&quot;ResponseRewrite&quot;

I&#39;m having trouble enabling the socket transport &quot;ssl&quot; in PHP.  When I run my script, I get the error:

&gt; Warning: fsockopen()
&gt; [function.fsockopen]: unable to
&gt; connect to ssl://www.my.site.com:443
&gt; (Unable to find the socket transport
&gt; &quot;ssl&quot; - did you forget to enable it
&gt; when you configured PHP?)

I&#39;m running IIS6 on Windows and this is what I&#39;ve done so far to try to get it working:

 - uncommented the php_openssl.dll and php_sockets.dll extensions in php.ini
 - made sure PHP was loading the ini file I made changes to (it is, and it&#39;s definitely loading other extensions, so I&#39;m fairly sure this isn&#39;t the problem)
 - made sure php_openssl.dll and php_sockets.dll were in the correct location
 - copied ssleay32.dll and libeay32.dll to the main PHP folder, the WINDOWS folder and the WINDOWS/system32 folder
 - made sure the Windows path variable included the location of PHP
 - made sure the file permissions were correct on all the relevant files.

I&#39;ve restarted IIS after pretty much every change, but I haven&#39;t had any luck.  Is there anything obvious that I&#39;m doing wrong?  Is there anyway to troubleshoot this in smaller parts?  (So I can figure out the problem by the process of elimination...?)

Unfortunately Windows/IIS aren&#39;t my area of expertise--I&#39;ve been put in charge because nobody else seems to know anything.

Socket transport &quot;ssl&quot; in PHP not enabled

I know this is almost a duplicate of : https://stackoverflow.com/questions/1269706/the-error-login-failed-for-user-nt-authority-iusr-in-asp-net-and-sql-server-2 and https://stackoverflow.com/questions/97594/login-failed-for-user-username-system-data-sqlclient-sqlexception-with-linq-i but some things don&#39;t add up compared to other appliations on my server and I am not sure why.

**Boxes being used:**

Web Box  
SQL Box  
SQL Test Box

**My Application:**

I have an ASP.NET Web Application, which references a class library that uses LINQ-to-SQL. Connection string set up properly in the class library. As per https://stackoverflow.com/questions/97594/login-failed-for-user-username-system-data-sqlclient-sqlexception-with-linq-i I also added this connection string to the Web Application. 

The connection string uses SQL credentials as so (in both web app and class library):

     &lt;add name=&quot;Namespace.My.MySettings.ConnectionStringProduction&quot;
            connectionString=&quot;Data Source=(SQL Test Box);Initial Catalog=(db name);Persist Security Info=True;User ID=ID;Password=Password&quot;
            providerName=&quot;System.Data.SqlClient&quot; /&gt;

This connection confirmed as working via adding it to Server Explorer. This is the connection string my .dbml file is using.

**The problem:**

I get the following error:

    System.Data.SqlClient.SqlException: Login failed for user &#39;DOMAIN\MACHINENAME$&#39;.

Now referencing this https://stackoverflow.com/questions/1269706/the-error-login-failed-for-user-nt-authority-iusr-in-asp-net-and-sql-server-2 it says that&#39;s really the local network service and using any other non-domain name will not work. 

But I am confused because I&#39;ve checked both SQL Box and SQL Test Box SQL Management Studio and both have `NT AUTHORITY/NETWORK SERVICE` under Security -&gt; Logins, at the database level, that isn&#39;t listed under Security -&gt; Users, but at the database level Security -&gt; Users I have the user displayed in the connection string.

At NTFS level on web server, the permissions have NETWORK SERVICE has full control.

The reason why I am confused is because I have many other web applications on my Web Server, that reference databases on both SQL Box and SQL Test Box, and they all work. But I cannot find a difference between them and my current application, other than I am using a class library. Will that matter? Checking NTFS permissions, setup of Security Logins at the server and databases levels, connection string and method of connecting (SQL Server credentials), and IIS application pool and other folder options, are all the same.

Why do these applications work without adding the machinename$ to the permissions of either of my SQL boxes? But that is what the one link is telling me to do to fix this problem.


Content Type	Original Author	Original Content on Stackoverflow
Question	willem	View Question on Stackoverflow
Solution 1 - asp.net	Dan Goldstein	View Answer on Stackoverflow
Solution 2 - asp.net	Pascal Paradis	View Answer on Stackoverflow
Solution 3 - asp.net	piers7	View Answer on Stackoverflow
Solution 4 - asp.net	Jay Shah	View Answer on Stackoverflow
Solution 5 - asp.net	Jan Tielens	View Answer on Stackoverflow

What happens when I edit web.config?

asp.net Problem Overview

asp.net Solutions

Solution 1 - asp.net

Solution 2 - asp.net

Solution 3 - asp.net

Solution 4 - asp.net

Solution 5 - asp.net

How to inject Javascript in WebBrowser control?

Shortest Sudoku Solver in Python - How does it work?

Attributions