Do you mean like 

&lt;!-- language: lang-asp --&gt;

    &lt;%@ Import namespace=&quot;MyProgram.MyNamespace&quot; %&gt;

Also, inside the root `&lt;configuration&gt;` tag of web.config, you can add:

&lt;!-- language: lang-asp --&gt;

    &lt;system.web&gt;    
        &lt;pages&gt;
           &lt;namespaces&gt;
              &lt;add namespace=&quot;System&quot; /&gt;
              &lt;add namespace=&quot;System.Collections&quot; /&gt;
              &lt;add namespace=&quot;System.Collections.Specialized&quot; /&gt;
              &lt;add namespace=&quot;System.Configuration&quot; /&gt;
              &lt;add namespace=&quot;System.Text&quot; /&gt;
              &lt;!-- etc --&gt;
           &lt;/namespaces&gt;
        &lt;/pages&gt;
    &lt;/system.web&gt;

IllegalStateException is often used in Java when a method is invoked on an object in inappropriate state. What would you use instead in Python?

Is there an analogue to Java IllegalStateException in Python?

I thought the GC would call Dispose eventually if your program did not but that you should call Dispose() in your program just to make the cleanup deterministic.

However, from my little test program, I don&#39;t see Dispose getting called at all....

    public class Test : IDisposable
    {
        static void Main(string[] args)
        {
            Test s = new Test();
            s = null;
            GC.Collect();
            Console.ReadLine();
        }
    
        public Test()
        {
            Console.WriteLine(&quot;Constructor&quot;);
        }
    
        public void Dispose()
        {
            Console.WriteLine(&quot;Dispose&quot;);
        }
    }

// Output is just &quot;Constructor&quot;, I don&#39;t get &quot;Dispose&quot; as I would expect.  What&#39;s up?

**EDIT:** Yes, I know I should call Dispose() - I do follow the standard pattern when using disposable objects.  My question arises because I&#39;m trying to track down a leak in somebody elses code, which is managed C++ (another layer of complexity that would be the good subject of another thread).

Does garbage collector call Dispose()?

This likely applies to non MVC too.  But, Is it possible to use the &#39;using&#39; statement in my aspx views?

Reason is that I have the pages reference resource files for localised strings.  And some of these resource references are quite long - it&#39;s really cluttering my code.

Since most of the time these resources are in a namespace specifially for the view, I&#39;d just like to put a &#39;using Resources.This.that&#39; at the top of the page.  I don&#39;t seem to be able to though - is there a way?

Thanks

Is it possible to use the &#39;using&#39; statement in my aspx views? (ASP.NET MVC)

This likely applies to non MVC too. But, Is it possible to use the 'using' statement in my aspx views?
Reason is that I have the pages reference resource files for localised strings. And some of these resource references are quite long - it's really cluttering my code.
Since most of the time these resources are in a namespace specifially for the view, I'd just like to put a 'using Resources.This.that' at the top of the page. I don't seem to be able to though - is there a way?
Thanks

What is the difference between 

    try { }
    catch
    { throw; }

and

    try { }
    catch(Exception e)
    { throw e;}

?

And when should I use one or the other?


The difference between try/catch/throw and try/catch(e)/throw e

I&#39;m new to C#. 

I know in vb.net, i can do this:

    Dim guid as string = System.Guid.NewGuid.ToString

In C#, I&#39;m trying to do 

    String guid = System.Guid.NewGuid().ToString;

but i get an &quot;**Cannot convert method group &#39;ToString&#39; to non-delegate type &#39;string&#39;. Did you intend to invoke the method**?&quot; error.



How to convert a GUID to a string in C#?

I need to order by 2 columns using the entity framework.

How is that done?

    return _repository.GetSomething().OrderBy(x =&gt; x.Col1   .. Col2)?

i.e 

    SELECT * FROM Foo ORDER BY Col1, Col2



&quot;Order by Col1, Col2&quot; using entity framework

I&#39;d like to prove that a GUID is not unique in a simple test program.
I expected the following code to run for hours, but it&#39;s not working. How can I make it work?

    BigInteger begin = new BigInteger((long)0);
    BigInteger end = new BigInteger(&quot;340282366920938463463374607431768211456&quot;,10);  //2^128
    for(begin; begin&lt;end; begin++)
      Console.WriteLine(System.Guid.NewGuid().ToString());

I&#39;m using C#.


Simple proof that GUID is not unique

I have some object that is instantiated in code behind, for instance, the XAML is called window.xaml and within the window.xaml.cs

    protected Dictionary&lt;string, myClass&gt; myDictionary;

How can I bind this object to, for example, a list view, using only XAML markups?

**Update:**

(This is exactly I have in my test code):

    &lt;Window x:Class=&quot;QuizBee.Host.Window1&quot;
        xmlns=&quot;http://schemas.microsoft.com/winfx/2006/xaml/presentation&quot;
        xmlns:x=&quot;http://schemas.microsoft.com/winfx/2006/xaml&quot;
        Title=&quot;{Binding windowname}&quot; Height=&quot;300&quot; Width=&quot;300&quot;
        DataContext=&quot;{Binding RelativeSource={RelativeSource Self}}&quot;&gt;
        &lt;Grid&gt;
        &lt;/Grid&gt;
    &lt;/Window&gt;

And in codebehind

    public partial class Window1 : Window
    {
        public const string windowname = &quot;ABCDEFG&quot;;

        public Window1()
        {
            InitializeComponent();
        }
    }

Suppose the title should become &quot;ABCDEFG&quot; right? but it ends up showing nothing.

Binding objects defined in code-behind

I have two buttons on my MVC form:

    &lt;input name=&quot;submit&quot; type=&quot;submit&quot; id=&quot;submit&quot; value=&quot;Save&quot; /&gt;
    &lt;input name=&quot;process&quot; type=&quot;submit&quot; id=&quot;process&quot; value=&quot;Process&quot; /&gt;

From my Controller action how do I know which one have been pressed?

MVC which submit button has been pressed

I&#39;m using ASP.NET MVC and I&#39;d like all user entered string fields to be trimmed before they&#39;re inserted into the database.   And since I have many data entry forms, I&#39;m looking for an elegant way to trim all strings instead of explicitly trimming every user supplied string value.  I&#39;m interested to know how and when people are trimming strings.

I thought about perhaps creating a custom model binder and trimming any string values there...that way, all my trimming logic is contained in one place.  Is this a good approach?  Are there any code samples that do this?

Best way to trim strings after data entry. Should I create a custom model binder?

When I run a webapp from Visual Studio 2008 SP1 using the internal web server (not IIS) I receive the above mentioned error.

The full error (source file *Default.aspx.cs*):

&gt; Compiler Error Message: CS0433: The
&gt; type &#39;WebApplication3.Site1&#39; exists in
&gt; both
&gt; &#39;c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary
&gt; ASP.NET
&gt; Files\root\aa563bcf\59deedc0\App_Web_site1.master.cdcab7d2.muczzy9v.dll&#39;
&gt; and
&gt; &#39;c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary
&gt; ASP.NET
&gt; Files\root\aa563bcf\59deedc0\assembly\dl3\44c3a3cf\80dd34ed_6968ca01\WebApplication3.DLL&#39;

The preceding full warning:

&gt; Warning: CS0436: The type
&gt; &#39;WebApplication3._Default&#39; in
&gt; &#39;c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary
&gt; ASP.NET
&gt; Files\root\aa563bcf\59deedc0\App_Web_default.aspx.cdcab7d2._tlkwdos.0.cs&#39;
&gt; conflicts with the imported type
&gt; &#39;WebApplication3._Default&#39; in
&gt; &#39;c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary
&gt; ASP.NET
&gt; Files\root\aa563bcf\59deedc0\assembly\dl3\44c3a3cf\e096e61c_6568ca01\WebApplication3.DLL&#39;.
&gt; Using the type defined in
&gt; &#39;c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary
&gt; ASP.NET
&gt; Files\root\aa563bcf\59deedc0\App_Web_default.aspx.cdcab7d2._tlkwdos.0.cs&#39;.

Source of warning points to an intermediate file *App\_Web\_default.aspx.cdcab7d2.\_tlkwdos.0.cs*:

    Line 162:    
    Line 163:    [System.Runtime.CompilerServices.CompilerGlobalScopeAttribute()]
    Line 164:    public class default_aspx : global::WebApplication3._Default, System.Web.IHttpHandler {
    Line 165:        
    Line 166:        private static bool @__initialized;

and my question: where does this come from?

The webapp (not website!)  has one *Default.aspx* and one *Site1.Master*, no dependencies. They&#39;re almost empty, with an `asp:Label` on the page. Previously, this webapp worked fine. When I remove any references in Default.aspx.cs to the master, all goes well. The master has some code only.

It&#39;s actually one of many little fire-and-forget test webapps, so I couldn&#39;t care less. But I hadn&#39;t seen this before and now I&#39;m curious of what to do, other then copying code into a new project (cleaning solution doesn&#39;t help).

Note: I&#39;ve read [this post][1] and some others, they don&#39;t apply.


  [1]: https://stackoverflow.com/questions/371426/asp-net-error-the-type-foo-exists-in-both-temp1-dll-and-temp2-dll

Where does error CS0433 &quot;Type &#39;X&#39; already exists in both A.dll and B.dll &quot; come from?

I&#39;m attempting upload multiple files in ASP.NET MVC and I have this simple foreach loop in my controller


    foreach (HttpPostedFileBase f in Request.Files)
    {
        if (f.ContentLength &gt; 0)
            FileUpload(f);
    }

The previous code generates this error:

    Unable to cast object of type &#39;System.String&#39; to type &#39;System.Web.HttpPostedFile&#39;. 

What I don&#39;t understand is why Request.Files[1] returns an HttpPostedFileBase but when it&#39;s iterated over, it returns strings (presumably the file names).

Note: I know this can be solved with a for loop.
Also, I tried using HttpPostedFile, with the same error.


foreach on Request.Files

I need to iterate through a `DataTable`. I have an column there  named `ImagePath`.

When I am using `DataReader` I do it this way:

    SqlDataReader dr = null;
    dr = cmd.ExecuteReader();
    while (dr.Read())
    {
        TextBox1.Text = dr[&quot;ImagePath&quot;].ToString();
    }

How can I achieve the same thing using `DataTable`?


How to iterate through a DataTable

I am looking at the [MvcContrib][1] Grid component and I&#39;m fascinated, yet at the same time repulsed, by a syntactic trick used in the [Grid syntax][2]:

    .Attributes(style =&gt; &quot;width:100%&quot;)

The syntax above sets the style attribute of the generated HTML to `width:100%`. Now if you pay attention, &#39;style&#39; is nowhere specified. It is deduced from the **name** of the parameter in the expression! I had to dig into this and found where the &#39;magic&#39; happens:

    Hash(params Func&lt;object, TValue&gt;[] hash)
    {
        foreach (var func in hash)
        {
            Add(func.Method.GetParameters()[0].Name, func(null));
        }
    }

So indeed, the code is using the formal, compile time, name of parameters to create the dictionary of attribute name-value pairs. The resulted syntax construct is very expressive indeed, but at the same time very dangerous.

The general use of lambda expressions allows for replacement of the *names* used without side effect. I see an example in a book that says `collection.ForEach(book =&gt; Fire.Burn(book))` I know I can write in my code `collection.ForEach(log =&gt; Fire.Burn(log))` and *it means the same thing*. But with the MvcContrib Grid syntax here all of a sudden, I find code that actively looks and makes decisions based on the names I choose for my variables!

So is this common practice with the C# 3.5/4.0 community and the lambda expressions lovers? Or is a rogue one trick maverick I shouldn&#39;t worry about?

  [1]: http://www.codeplex.com/MVCContrib
  [2]: http://www.jeremyskinner.co.uk/2009/02/22/rewriting-the-mvccontrib-grid-part-2-new-syntax/






Reflecting parameter name: abuse of C# lambda expressions or syntax brilliance?

I&#39;m developing an ASP MVC web project. Now I have a requirement which forces me to deploy to an IIS7 inmiddle of development (to check some features). I&#39;m getting the above mentioned error message whenever I try to type the URL of the web site. (Note: development machine: Vista Home Premium, IIS7)

What I have done until now:

Edited the HOSTS file (C:\WINDOWS\system32\drivers\etc\hosts).

Put two domains in it (127.0.0.1  domain1.com   &amp;   127.0.0.1  domain2.com).

Created a folder c:\websites\dirOfApplication and deployed from within Visual Studio 8 to this folder.

In IIS7 created a new site with host name domain1.com and application folder the above.

Typing the address domain1.com in Web browser results in the above error (HTTP Error 403.14 - Forbidden - The Web server is configured to not list the contents of this directory.)

I think I&#39;m missing something but don&#39;t know what! Tryed to deploy the files  System.Web.Mvc, System.Web.Abstraction &amp; System.Web.Routing wit the same outcome. Whenever I try to hit F5 and run the application, it works fine!

ASP MVC in IIS 7 results in: HTTP Error 403.14 - Forbidden

I&#39;m getting an intermittent exception saying that asp.net mvc can’t find the action method. Here’s the exception:

&gt; A public action method &#39;Fill&#39; could
&gt; not be found on controller
&gt; &#39;Schoon.Form.Web.Controllers.ChrisController&#39;.

I think I have the routing set up correctly because this application works most of the time. Here is the controller’s action method.

    [ActionName(&quot;Fill&quot;)]
    [AcceptVerbs(HttpVerbs.Get | HttpVerbs.Post), UserIdFilter, DTOFilter]
    public ActionResult Fill(int userId, int subscriberId, DisplayMode? mode)
    {
         //…
    }

The route:

    routes.MapRoute(
            &quot;SchoonForm&quot;,
            &quot;Form/Fill/{subscriberId}&quot;,
            new { controller = &quot;ChrisController&quot;, action = &quot;Fill&quot; },
            new { subscriberId = @&quot;\d+&quot; }
        );

And here is the stack:

&gt; System.Web.HttpException: A public
&gt; action method &#39;Fill&#39; could not be
&gt; found on controller
&gt; &#39;Schoon.Form.Web.Controllers.ChrisController&#39;.
&gt; at
&gt; System.Web.Mvc.Controller.HandleUnknownAction(String
&gt; actionName) in
&gt; C:\dev\ThirdParty\MvcDev\src\SystemWebMvc\Mvc\Controller.cs:line
&gt; 197  at
&gt; System.Web.Mvc.Controller.ExecuteCore()
&gt; in
&gt; C:\dev\ThirdParty\MvcDev\src\SystemWebMvc\Mvc\Controller.cs:line
&gt; 164  at
&gt; System.Web.Mvc.ControllerBase.Execute(RequestContext
&gt; requestContext) in
&gt; C:\dev\ThirdParty\MvcDev\src\SystemWebMvc\Mvc\ControllerBase.cs:line
&gt; 76  at
&gt; System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext
&gt; requestContext) in
&gt; C:\dev\ThirdParty\MvcDev\src\SystemWebMvc\Mvc\ControllerBase.cs:line
&gt; 87  at
&gt; System.Web.Mvc.MvcHandler.ProcessRequest(HttpContextBase
&gt; httpContext) in
&gt; C:\dev\ThirdParty\MvcDev\src\SystemWebMvc\Mvc\MvcHandler.cs:line
&gt; 80  at
&gt; System.Web.Mvc.MvcHandler.ProcessRequest(HttpContext
&gt; httpContext) in
&gt; C:\dev\ThirdParty\MvcDev\src\SystemWebMvc\Mvc\MvcHandler.cs:line
&gt; 68  at
&gt; System.Web.Mvc.MvcHandler.System.Web.IHttpHandler.ProcessRequest(HttpContext
&gt; httpContext) in
&gt; C:\dev\ThirdParty\MvcDev\src\SystemWebMvc\Mvc\MvcHandler.cs:line
&gt; 104  at
&gt; System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
&gt; at
&gt; System.Web.HttpApplication.ExecuteStep(IExecutionStep
&gt; step, Boolean&amp; completedSynchronously)

Here is an example of my filters they all work the same way:

    public class UserIdFilter : ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            const string Key = &quot;userId&quot;;
    
            if (filterContext.ActionParameters.ContainsKey(Key))
            {
                filterContext.ActionParameters[Key] = // get the user id from session or cookie
            }
    
            base.OnActionExecuting(filterContext);
        }
    }

Thanks,
Chris

Content Type	Original Author	Original Content on Stackoverflow
Question	UpTheCreek	View Question on Stackoverflow
Solution 1 - C#	user1228	View Answer on Stackoverflow

Is it possible to use the 'using' statement in my aspx views? (ASP.NET MVC)

C# Problem Overview

C# Solutions

Solution 1 - C#

Does garbage collector call Dispose()?

Is there an analogue to Java IllegalStateException in Python?

Attributions