I have form which is opened using ShowDialog Method. In this form i have a Button called More.
If we click on More it should open another form and it should close the current form.

on More Button&#39;s Click event Handler i have written the following code

  

    MoreActions objUI = new MoreActions (); 
    objUI.ShowDialog();
    this.Close();

But what is happening is, it&#39;s not closing the first form. So, i modified this code to 

  

    MoreActions objUI = new MoreActions (); 
    objUI.Show();
    this.Close();

Here, The second form is getting displayed and within seconds both the forms getting closed.

Can anybody please help me to fix issue.  What i need to do is, If we click on More Button, it should open another form and close the first form.

Any kind of help will be really helpful to me.

How to open a new form from another form

I need to search a string and replace all occurrences of `%FirstName%` and `%PolicyAmount%` with a value pulled from a database. The problem is the capitalization of FirstName varies. That prevents me from using the `String.Replace()` method. I&#39;ve seen web pages on the subject that suggest

    Regex.Replace(strInput, strToken, strReplaceWith, RegexOptions.IgnoreCase);


However for some reason when I try and replace `%PolicyAmount%` with `$0`, the replacement never takes place. I assume that it has something to do with the dollar sign being a reserved character in regex. 

Is there another method I can use that doesn&#39;t involve sanitizing the input to deal with regex special characters?

Is there an alternative to string.Replace that is case-insensitive?

Could someone supply some code that would get the xpath of a System.Xml.XmlNode instance?

Thanks!

How to get xpath from an XmlNode instance

For example:

    BitmapImage bitmap = new BitmapImage();
     
    byte[] buffer = GetHugeByteArray(); // from some external source
    using (MemoryStream stream = new MemoryStream(buffer, false))
    {
        bitmap.BeginInit();
        bitmap.CacheOption = BitmapCacheOption.OnLoad;
        bitmap.StreamSource = stream;
        bitmap.EndInit();
        bitmap.Freeze();
    }

Can you tell me any more about `using`?

**Edit:**

As was discussed in the comments of JaredPar&#39;s post, this question is more concerned with an implementation of `Using` in VS2003.  It was pointed out that `Using` was not introduced until .NET 2.0 (VS2005).  JaredPar posted an equivalent workaround.

How does the &quot;Using&quot; statement translate from C# to VB?

I&#39;ve written my own custom data layer to persist to a specific file and I&#39;ve abstracted it with a custom DataContext pattern.

This is all based on the .NET 2.0 Framework (given constraints for the target server), so even though some of it might look like LINQ-to-SQL, its not! I&#39;ve just implemented a similar data pattern.


See example below for example of a situation that I cannot yet explain.

To get all instances of `Animal` - I do this and it works fine
    
    public static IEnumerable&lt;Animal&gt; GetAllAnimals() {
            AnimalDataContext dataContext = new AnimalDataContext();
                return dataContext.GetAllAnimals();
    }

And the implementation of the `GetAllAnimals()` method in the `AnimalDataContext` below

    public IEnumerable&lt;Animal&gt; GetAllAnimals() {
            foreach (var animalName in AnimalXmlReader.GetNames())
            {
                yield return GetAnimal(animalName);
            }
    }

The `AnimalDataContext` implements `IDisposable` because I&#39;ve got an `XmlTextReader` in there and I want to make sure it gets cleaned up quickly.  

Now if I wrap the first call inside a using statement like so

    public static IEnumerable&lt;Animal&gt; GetAllAnimals() {
            using(AnimalDataContext dataContext = new AnimalDataContext()) {
                return dataContext.GetAllAnimals();
            }
    }

and put a break-point at the first line of the `AnimalDataContext.GetAllAnimals()` method and another break-point at the first line in the `AnimalDataContext.Dispose()` method, and execute...

**the `Dispose()` method is called FIRST so that `AnimalXmlReader.GetNames()` gives *&quot;object reference not set to instance of object&quot;* exception because `AnimalXmlReader` has been set to `null` in the `Dispose()` ???**

Any ideas? I have a hunch that its related to `yield return` not being allowed to be called inside a try-catch block, which `using` effectively represents, once compiled... 



yield return statement inside a using() { } block Disposes before executing

I have added a custom section called `secureAppSettings` to my web.config file:
```xml
&lt;configuration&gt;
  &lt;configSections&gt;
    &lt;section name=&quot;secureAppSettings&quot; type=&quot;System.Configuration.NameValueSectionHandler, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089&quot; /&gt;
  &lt;/configSections&gt;
  &lt;secureAppSettings&gt;
    &lt;add key=&quot;userName&quot; value=&quot;username&quot;/&gt;
    &lt;add key=&quot;userPassword&quot; value=&quot;password&quot;/&gt;
  &lt;/secureAppSettings&gt;  
&lt;/configuration&gt;
```
`secureAppSettings` is decrypted and has two keys inside it.

Now in my code, I tried to access the keys like this:

    string userName = System.Configuration.ConfigurationManager.secureAppSettings[&quot;userName&quot;];
    string userPassword = System.Configuration.ConfigurationManager.secureAppSettings[&quot;userPassword&quot;];

But `null` is returning for these fields.

How can I get the field values?



How to read values from custom section in web.config

Regardless of what the user&#39;s local time zone is set to, using C# (.NET 2.0) I need to determine the time (DateTime object) in the Eastern time zone.

I know about these methods but there doesn&#39;t seem to be an obvious way to get a DateTime object for a different time zone than what the user is in.

     DateTime.Now
     DateTime.UtcNow
     TimeZone.CurrentTimeZone

Of course, the solution needs to be daylight savings time aware.



Get DateTime For Another Time Zone Regardless of Local Time Zone

In a [.NET][1] 2.0 C# application I use the following code to detect the operating system platform:

    string os_platform = System.Environment.OSVersion.Platform.ToString();

This returns &quot;Win32NT&quot;. The problem is that it returns &quot;Win32NT&quot; even when running on Windows Vista 64-bit.

Is there any other method to know the correct platform (32&amp;nbsp;or 64&amp;nbsp;bit)?

Note that it should also detect 64&amp;nbsp;bit when run as a 32&amp;nbsp;bit application on Windows 64&amp;nbsp;bit.

  [1]: http://en.wikipedia.org/wiki/.NET_Framework


How to detect Windows 64-bit platform with .NET?

I am getting the following error when I post back a page from the client-side. I have JavaScript code that modifies an asp:ListBox on the client side.

How do we fix this?

Error details below:

    Server Error in &#39;/XXX&#39; Application.

    --------------------------------------------------------------------------------
    Invalid postback or callback argument.  Event validation is enabled using &lt;pages enableEventValidation=&quot;true&quot;/&gt; in configuration or &lt;%@ Page EnableEventValidation=&quot;true&quot; %&gt; in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
    Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

    Exception Details: System.ArgumentException: Invalid postback or callback argument.  Event validation is enabled using &lt;pages enableEventValidation=&quot;true&quot;/&gt; in configuration or &lt;%@ Page EnableEventValidation=&quot;true&quot; %&gt; in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

    Source Error:

    An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

    Stack Trace:

    [ArgumentException: Invalid postback or callback argument.  Event validation is enabled using &lt;pages enableEventValidation=&quot;true&quot;/&gt; in configuration or &lt;%@ Page EnableEventValidation=&quot;true&quot; %&gt; in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.]
       System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument) +2132728
       System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument) +108
       System.Web.UI.WebControls.ListBox.LoadPostData(String postDataKey, NameValueCollection postCollection) +274
       System.Web.UI.WebControls.ListBox.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +11
       System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +353
       System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1194

    --------------------------------------------------------------------------------
    Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433

Invalid postback or callback argument.  Event validation is enabled using &#39;&lt;pages enableEventValidation=&quot;true&quot;/&gt;&#39;

I am trying to build a pie chart from a dictionary. Before I display the pie chart, I want to tidy up the data. I&#39;m removing any pie slices that would be less than 5% of the pie and putting them in a &quot;Other&quot; pie slice. However I&#39;m getting a `Collection was modified; enumeration operation may not execute` exception at runtime.

I understand why you can not add or remove items from a dictionary while iterating over them. However I don&#39;t understand why you can&#39;t simply change a value for an existing key within the foreach loop.

Any suggestions re: fixing my code, would be appreciated.

    Dictionary&lt;string, int&gt; colStates = new Dictionary&lt;string,int&gt;();
    // ...
    // Some code to populate colStates dictionary
    // ...

    int OtherCount = 0;

    foreach(string key in colStates.Keys)
    {

        double  Percent = colStates[key] / TotalCount;
        
        if (Percent &lt; 0.05)
        {
            OtherCount += colStates[key];
            colStates[key] = 0;
        }
    }

    colStates.Add(&quot;Other&quot;, OtherCount);

Editing dictionary values in a foreach loop

How can I get Environnment variables and if something is missing, set the value?


How do I get and set Environment variables in C#?

I am newbie in .net. I am doing compression and decompression string in C#. There is a XML and I am converting in string and after that I am doing compression and decompression.There is no compilation error in my code except when I decompression my code and return my string, its returning only half of the XML.

Below is my code, please correct me where I am wrong.

Code:

    class Program
    {
        public static string Zip(string value)
        {
            //Transform string into byte[]  
            byte[] byteArray = new byte[value.Length];
            int indexBA = 0;
            foreach (char item in value.ToCharArray())
            {
                byteArray[indexBA++] = (byte)item;
            }

            //Prepare for compress
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            System.IO.Compression.GZipStream sw = new System.IO.Compression.GZipStream(ms, System.IO.Compression.CompressionMode.Compress);

            //Compress
            sw.Write(byteArray, 0, byteArray.Length);
            //Close, DO NOT FLUSH cause bytes will go missing...
            sw.Close();

            //Transform byte[] zip data to string
            byteArray = ms.ToArray();
            System.Text.StringBuilder sB = new System.Text.StringBuilder(byteArray.Length);
            foreach (byte item in byteArray)
            {
                sB.Append((char)item);
            }
            ms.Close();
            sw.Dispose();
            ms.Dispose();
            return sB.ToString();
        }
    
        public static string UnZip(string value)
        {
            //Transform string into byte[]
            byte[] byteArray = new byte[value.Length];
            int indexBA = 0;
            foreach (char item in value.ToCharArray())
            {
                byteArray[indexBA++] = (byte)item;
            }

            //Prepare for decompress
            System.IO.MemoryStream ms = new System.IO.MemoryStream(byteArray);
            System.IO.Compression.GZipStream sr = new System.IO.Compression.GZipStream(ms,
                System.IO.Compression.CompressionMode.Decompress);

            //Reset variable to collect uncompressed result
            byteArray = new byte[byteArray.Length];

            //Decompress
            int rByte = sr.Read(byteArray, 0, byteArray.Length);

            //Transform byte[] unzip data to string
            System.Text.StringBuilder sB = new System.Text.StringBuilder(rByte);
            //Read the number of bytes GZipStream red and do not a for each bytes in
            //resultByteArray;
            for (int i = 0; i &lt; rByte; i++)
            {
                sB.Append((char)byteArray[i]);
            }
            sr.Close();
            ms.Close();
            sr.Dispose();
            ms.Dispose();
            return sB.ToString();
        }
        
        static void Main(string[] args)
        {
            XDocument doc = XDocument.Load(@&quot;D:\RSP.xml&quot;);
            string val = doc.ToString(SaveOptions.DisableFormatting);
            val = Zip(val);
            val = UnZip(val);
        }
    } 

My XML size is 63KB.

Compression/Decompression string with C#

I have a datetime coming back from an XML file in the format:

&gt; 20080916 11:02

as in 

&gt; yyyymm hh:ss

How can i get the datetime.parse function to pick up on this? Ie parse it without erroring?
Cheers

datetime.parse and making it work with a specific format

I have downloaded Privoxy few weeks ago and for the fun I was curious to know how a simple version of it can be done.

I understand that I need to configure the browser (client) to send request to the proxy. The proxy send the request to the web (let say it&#39;s a http proxy). The proxy will receive the answer... but how can the proxy send back the request to the browser (client)?

I have search on the web for C# and http proxy but haven&#39;t found something that let me understand how it works behind the scene correctly. (I believe I do not want a reverse proxy but I am not sure).

Does any of you have some explication or some information that will let me continue this small project?

## Update
This is what I understand (see graphic below). 

**Step 1** I configure the client (browser) for all request to be send to 127.0.0.1 at the port the Proxy listen. This way, request will be not sent to the Internet directly but will be processed by the proxy.

**Step2** The proxy see a new connection, read the HTTP header and see the request he must executes. He executes the request.

**Step3** The proxy receive an answer from the request. Now he must send the answer from the web to the client but how???

![alt text][1]

### Useful link ####
[Mentalis Proxy][2] : I have found this project that is a proxy (but more that I would like). I might check the source but I really wanted something basic to understand more the concept.

[ASP Proxy][3] : I might be able to get some information over here too.

[Request reflector][4] : This is a simple example.

Here is a [Git Hub Repository with a Simple Http Proxy][5].


  [1]: http://i.stack.imgur.com/zNWDc.png
  [2]: http://www.mentalis.org/soft/projects/proxy/
  [3]: http://www.codeproject.com/KB/aspnet/asproxy.aspx
  [4]: http://bartdesmet.net/blogs/bart/archive/2007/02/22/httplistener-for-dummies-a-simple-http-request-reflector.aspx
  [5]: https://github.com/MrDesjardins/SimpleHttpProxy

How to create a simple proxy in C#?

I need to access the assembly of my project in C# .NET 2.0.

I can see the GUID in the &#39;Assembly Information&#39; dialog in under project properties, and at the moment I have just copied it to a const in the code. The GUID will never change, so this is not that bad of a solution, but it would be nice to access it directly. Is there a way to do this?


How do I programmatically get the GUID of an application in .NET 2.0

I&#39;m trying to customize the location of the `user.config` file. Currently it&#39;s stored with a hash and version number 

    %AppData%\[CompanyName]\[ExeName]_Url_[some_hash]\[Version]\

I want to it be agnostic to the version of the application

    %AppData%\[CompanyName]\[ProductName]\

**Can this be done and how? What are the implications?** Will the user lose their settings from the previous version after upgrading?

Can I control the location of .NET user settings to avoid losing settings on application upgrade?

One of our clients has an old WinForms application that contains forms with a lot of controls on them. Some of those controls have a deep hierarchy and that makes it to hard to select them in the designer.

I need to understand this hierarchy to make modifications to the application to correct some bugs. Is there a way to see this hierarchy clearly? For example, is there something available that is similar to what can be seen in an .aspx source file when you have a breadcrumb of where you are in the HTML hierarchy (HTML &gt; Body &gt; div &gt; etc.)? Or something more visual maybe?



Show control hierarchy in the WinForms designer

When I hit F5 (debugging mode) nothing happens. Building works correctly, exe file I can launch properly, but can&#39;t start debug. Why?

Debugging doesn&#39;t start

What’s the difference between the &lt;code&gt;System.Array.CopyTo()&lt;/code&gt; and &lt;code&gt;System.Array.Clone()&lt;/code&gt;?

Difference between the System.Array.CopyTo() and System.Array.Clone()

Whenever a user reports an error such as 
&gt; **System.Runtime.InteropServices.SEHException** - External component has thrown an exception?

is there anything that I as a programmer can do to determine the cause? 


Scenario : One user (using a program my company wrote) has reported this error. 
This may or may not have been a one off error. They mentioned that in the last month, the computer has twice &#39;stopped working&#39;. I have learnt from experience, not to take this description too literally, as it usually means that someone relating to the computer is not working as expected. They were unable to give me more details and I could not find any logged errors. Hence it may or may not have been this error.

From the stack-trace, the actual error was when constructing a class which does not directly call any interop code, but perhaps complicated by the fact that the object may be part of a list that is databound to a DevExpress Grid.

The error was &#39;caught&#39; by an unhandled exception routine which normally will close down the program, but has an option to ignore and continue. If they opted to ignore the error, then the program continued working but the error re-occurred when this routine was next run. However it did not occur again after closing and restarting our application. 

The computer in question did not seem to be stressed out. It is running Vista Business, has 2GB of memory and according to Task Manager was only using about half of that with our application just about 200Mb. 

There is one other piece of information that may or may not be relevant. Another section of the same program uses a third party component which is effectively a dotnet wrapper around a native dll and this component does have a known issue where very occasionally, you get a 

&gt; Attempted to read or write protected memory. This is often an indication that other memory is corrupt 

The component makers say that this has been fixed in the latest version of their component which we are using in-house, but this has not been given to the customer yet.

Given that the consequences of the error are low (no work is lost and restarting the program and getting back to where they were only takes a minute at most) and given that the customer will shortly be getting a new version (with the updated third-party component), I can obviously cross my fingers and hope the error won&#39;t occur again. 

But is there anything more I can do?

How should you diagnose the error SEHException - External component has thrown an exception

I am using: 

    File.Exists(filepath)

What I would like to do is swop this out for a pattern, because the first part of the filename changes.

For example: the file could be

    01_peach.xml
    02_peach.xml
    03_peach.xml

How can I check if the file exists based on some kind of search pattern?

file exists by file name pattern

This works just fine:

        protected void txtTest_Load(object sender, EventArgs e)
        {
            if (sender is TextBox) {...}

        }

Is there a way to check if sender is NOT a TextBox, some kind of an equivalent of != for &quot;is&quot;?

Please, don&#39;t suggest moving the logic to ELSE{} :)

Check if object is NOT of type (!= equivalent for &quot;IS&quot;) - C#

I have two DLL files that have the same namespace but they have different methods and types.
How can I reference both DLLs in my project and use their methods and types?

By the way, these two DLLs have some methods and types with the same name but different implementation and some unique methods and types.

two different DLL with same namespace

Is there a way to Invoke an overloaded method using reflection in .NET (2.0).  I have an application that dynamically instantiates classes that have been derived from a common base class.  For compatibility purposes, this base class contains 2 methods of the same name, one with parameters, and one without.  I need to call the parameterless method via the Invoke method.  Right now, all I get is an error telling me that I&#39;m trying to call an ambiguous method.

Yes, I *could* just cast the object as an instance of my base class and call the method I need.  Eventually that *will* happen, but right now, internal complications will not allow it.

Any help would be great!  Thanks.

How to use Reflection to Invoke an Overloaded Method in .NET

I&#39;m looking for a way in .NET (2.0, C# in particular) for source code to trigger a debugging break as if a breakpoint was set at that point, without having to remember to set a specific breakpoint there in the debugger, and without interfering with production runtime.

Our code needs to swallow exceptions in production so we don&#39;t disrupt a client application that links to us, but I&#39;m trying to set it up so that such errors will pop up to be analyzed if it happens to be running in a debugger, and otherwise will be safely ignored.

My attempt to use &lt;code&gt;Debug.Assert(false)&lt;/code&gt; has been less than ideal, and I assume that &lt;code&gt;Debug.Fail()&lt;/code&gt; would behave the same way.  It should theoretically have no effect in production, and it does successfully stop when debugging, but by design there is (as far as I can tell) no way to continue execution if you want to ignore that error, like you could with an actual breakpoint, and like it would do in production where we swallow the error.  It also apparently breaks evaluation of variable state because the debugger actually stops down in native system code and not in ours, so it&#39;s debugging help is limited.  (Maybe I&#39;m missing some way of getting back into things to look at the variables and so on where it happened. ???)

I was hoping for something like &lt;code&gt;Debug.Break()&lt;/code&gt;, but it doesn&#39;t seem to exist (unless maybe in a later version of .NET?), and no other &lt;code&gt;Debug&lt;/code&gt; methods seem applicable, either.

**Update:** While ctacke&#39;s answer is the best match for what I was looking for, I have since also discovered a trick with Debug.Assert()--when running in the debugger--Pause the debugger, go to the code for the Debug.Assert call pending (highlighted in green because it is down in the framework code) and hit Step-Out (shift-F11), then hit Ignore in the assert dialog box.  This will leave the debugger paused upon the return of the assert (and able to continue execution as if it hadn&#39;t occurred, because it was ignored).  There may be other ways to do much the same thing (does hitting Retry do this more directly?), but this way was intuitive.

Can .NET source code hard-code a debugging breakpoint?

I am considering converting a project that I&#39;ve inherited from .net 1.1 to .net 2.0.  The main warning I&#39;m concerned about is that it wants me to switch from `System.Web.Mail` to using `System.Net.Mail`.

I&#39;m not ready to re-write all the components using the obsolete `System.Web.Mail`, so I&#39;m curious to hear if any community members have had problems using it under .net 2.0?

.net: System.Web.Mail vs System.Net.Mail

Let&#39;s say I&#39;m working on a little batch-processing console app in VB.Net.  I want to be able to structure the app like this:

&lt;!-- language-all: lang-vb --&gt;

    Sub WorkerMethod()
       &#39;Do some work
       Trace.WriteLine(&quot;Work progress&quot;)

       &#39;Do more work
       Trace.WriteLine(&quot;Another progress update&quot;)

       &#39;...
    End Sub


    Sub Main()
       
       &#39;Do any setup, like confirm the user wants to continue or whatever
        
       WorkerMethod()     

    End Sub

Note that I&#39;m using `Trace` rather than `Console` for my output.  This is because the worker method may be called from elsewhere, or even live in a different assembly, and I want to be able to attach different trace listeners to it.  So how can I connect the console to the trace? 

I can already do it by defining a simple class (shown below) and adding an instance to the Trace&#39;s listeners collection, but I&#39;m wondering if there&#39;s a more accepted or built in way to accomplish this:

    Public Class ConsoleTrace
        Inherits Diagnostics.TraceListener

        Public Overloads Overrides Sub Write(ByVal message As String)
            Console.Write(message)
        End Sub

        Public Overloads Overrides Sub WriteLine(ByVal message As String)
            Console.WriteLine(message)
        End Sub
    End Class



Redirect Trace output to Console

I was looking for a generic method in .Net to encode a string for use in an Xml element or attribute, and was surprised when I didn&#39;t immediately find one.  So, before I go too much further, could I just be missing the built-in function?  

Assuming for a moment that it really doesn&#39;t exist, I&#39;m putting together my own generic &lt;code&gt;EncodeForXml(string data)&lt;/code&gt; method, and I&#39;m thinking about the best way to do this.  

The data I&#39;m using that prompted this whole thing could contain bad characters like &amp;amp;, &amp;lt;, &amp;quot;, etc.  It could also contains on occasion the properly escaped entities: &amp;amp;amp;, &amp;amp;lt;, and &amp;amp;quot;, which means just using a CDATA section may not be the best idea.  That seems kinda klunky anyay; I&#39;d much rather end up with a nice string value that can be used directly in the xml.

I&#39;ve used a regular expression in the past to just catch bad ampersands, and I&#39;m thinking of using it to catch them in this case as well as the first step, and then doing a simple replace for other characters.  

So, could this be optimized further without making it too complex, and is there anything I&#39;m missing? :

&lt;!-- language: vb.net --&gt;

    Function EncodeForXml(ByVal data As String) As String
        Static badAmpersand As new Regex(&quot;&amp;(?![a-zA-Z]{2,6};|#[0-9]{2,4};)&quot;)

        data = badAmpersand.Replace(data, &quot;&amp;amp;&quot;)

        return data.Replace(&quot;&lt;&quot;, &quot;&amp;lt;&quot;).Replace(&quot;&quot;&quot;&quot;, &quot;&amp;quot;&quot;).Replace(&quot;&gt;&quot;, &quot;gt;&quot;)
    End Function

_Sorry for all you C# -only folks-- I don&#39;t really care which language I use, but I wanted to make the Regex static and you can&#39;t do that in C# without declaring it outside the method, so this will be VB.Net_

Finally, we&#39;re still on .Net 2.0 where I work, but if someone could take the final product and turn it into an extension method for the string class, that&#39;d be pretty cool too.

**Update** The first few responses indicate that .Net does indeed have built-in ways of doing this.  But now that I&#39;ve started, I kind of want to finish my EncodeForXml() method just for the fun of it, so I&#39;m still looking for ideas for improvement.  Notably: a more complete list of characters that should be encoded as entities (perhaps stored in a list/map), and something that gets better performance than doing a .Replace() on immutable strings in serial.

Best way to encode text data for XML

Using C# .NET 2.0, I have a composite data class that does have the `[Serializable]` attribute on it.  I am creating an `XMLSerializer` class and passing that into the constructor:

    XmlSerializer serializer = new XmlSerializer(typeof(DataClass));

I am getting an exception saying: 

&gt; There was an error reflecting type.

Inside the data class there is another composite object.  Does this also need to have the `[Serializable]` attribute, or by having it on the top object, does it recursively apply it to all objects inside?


XmlSerializer - There was an error reflecting type

`System.IO.Directory.GetFiles()` returns a `string[]`.  What is the default sort order for the returned values?  I&#39;m assuming by name, but if so how much does the current culture effect it?  Can you change it to something like creation date? 

**Update:** MSDN points out that the sort order is not guaranteed for .Net 3.5, but the 2.0 version of the page doesn&#39;t say anything at all and neither page will help you sort by things like creation or modification time.  That information is lost once you have the array (it contains only strings).  I could build a comparer that would check for each file it gets, but that means accessing the file system repeatedly when presumably the .GetFiles() method already does this.  Seems very inefficient.

Sorting Directory.GetFiles()

Can a LINQ enabled app run on a machine that only has the .NET 2.0 runtime installed?

In theory, LINQ is nothing more than syntactic sugar, and the resulting IL code should look the same as it would have in .NET 2.0.

How can I write LINQ without using the .NET 3.5 libraries? Will it run on .NET 2.0?

LINQ on the .NET 2.0 Runtime

I need to determine the number of pages in a specified PDF file using C# code (.NET 2.0).  The PDF file will be read from the file system, and not from an URL.  Does anyone have any idea on how this could be done?  Note: Adobe Acrobat Reader is installed on the PC where this check will be carried out.

Determine number of pages in a PDF file

I&#39;m refactoring some objects that are serialized to XML but need to keep a few properties for backwards compatibility, I&#39;ve got a method that converts the old object into the new one for me and nulls the obsolete property. I want to use the `Obsolete` attribute to tell other developers not to use this property but it is causing the property to be ignored by the `XmlSerializer`.

Similar Code:

    [Serializable]
    public class MySerializableObject
    {
        private MyObject _oldObject;
        private MyObject _anotherOldObject;
        
        private MyObject _newBetterObject;

        [Obsolete(&quot;Use new properties in NewBetterObject to prevent duplication&quot;)]
        public MyObject OldObject
        {
          get { return _oldObject; }
          set { _oldObject = value; }
        }

        [Obsolete(&quot;Use new properties in NewBetterObject to prevent duplication&quot;)]
        public MyObject AnotherOldObject
        {
          get { return _anotherOldObject; }
          set { _anotherOldObject = value; }
        }

        public MyObject NewBetterObject
        {
          get { return _anotherOldObject; }
          set { _anotherOldObject = value; }
        } 
    }

Any ideas on a workaround? My best solution is to write obsolete in the XML comments...

**Update: I&#39;m using .NET 2.0**

Obsolete attribute causes property to be ignored by XmlSerialization

I&#39;m getting the error: &quot;This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.&quot;

I have a .NET 4.0 dll project that is being called by a .NET 2.0 project.  Is there a way to reconcile the difference in framework?

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