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Hi,
i must admitt that i dont undestand s##t how the new longhorn stuff is going to work ,
so im hoping someone can help me understand this 
1) this AVALON thing , is that the gui engine in longhorn?
2) is XAML a language that is intended to replace languages like c# , or what is the purpose of XAML?
3) can i code NON winforms controls in c# under longhorn? , meaning , if AVALON is a vectorbased gfx engine thinge , does it allow me to use c# to create custom controls for it?
4) is it correct that the XAML thinge is not the actual language , it is only indended to describe a UI , much like html , while i still use c# to make "codebehinds" , much like in asp.net but for winforms apps??
(and yes ive read the longhorn/win32 post in the lounge and i still dont get this)
//Roger
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1. MSDN describes Avalon as the "new Longhorn presentation subsystem." In other words, yeah, a new 3d-accelerated GUI engine specific to Longhorn.
2. XAML is not intended to replace any languages. XAML itself isn't a true programming language per se (example, you can't create functions, variables, etc.), it's very much like HTML and how it's used to describe web pages or XML and how it's used to describe relational data; they're all used to describe things, none of them actually perform things. In XAML's case, it will describe UI elements.
3. Yes, in addition to System.Windows.Forms.Controls, we'll also have the MSAvalon namespace. While I haven't read enough into the API to know if we can create custom Avalon controls in the traditional manner, we'll certainly be able to do custom controls by using a combo of MSAvalon and XAML.
4. XAML is a language, just like HTML or XML is. But yes, it's only intended to be used to describe UI elements, it can't be used by itself to create an app. MSDN describes typical Longhorn apps being comprised of your choice .Net language, like C#, with UI pages being written in XAML. Of course, we'll still have access to Windows Forms, but I'm guessing MS won't focus much on that.
The graveyards are filled with indispensible men.
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Judah H. wrote:
XAML is a language, just like HTML or XML is. But yes, it's only intended to be used to describe UI elements, it can't be used by itself to create an app.
That is not entirely true, since you can inline C# or VB code in a XAML file. Of course, for intermediate to big real world applications you would not want to use a declarative language such as XAML.
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apferreira wrote:
since you can inline C# or VB code in a XAML file
I guess you still need to compile the XAML file if it contained inline code whereas XAML in document format need not be compiled ?? 
regards,
Kannan
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Regarding your question, and quoting the Longhorn SDK[^]
...You can display pure "XAML" pages in a browser without compiling it. However, if your "XAML" page includes procedural code, you must compile the application before you can run it. "Avalon" cannot interpret uncompiled procedural code...
Also, to make my earlier remarks clear:
Another quote from the Longhorn SDK[^]
Procedural code can be part of the "XAML" file or be within a separate code-behind file..."XAML" has a corresponding object model that allows you to do anything in procedural code that you can do with markup. In fact, when you build an "XAML" application, the markup parser converts the markup into equivalent object model-based code...
And a quote from Don Box's blog[^]
...XAML is domain-neutral, so while it may be used to create desktop apps, web pages, and printable documents, it could also be used to create CRM apps, blogging backends, or highly concurrent web services provided you had a supporting CLR-based library to do the heavy lifting...
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Ok, I read the documentation on the Licensing things. How could I go about fixing this problem? Would I need to make changes programatically in my Mailer Code, the larger project? Thanks for helping out a newbie.
Frank 
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I wouldn't get rid of the licensing on the Mailer component. It's probably there for a reason. Instead, find out what you need to do to obtain a license for your tech writer.
If that isn't a viable option, remove the LicenseProviderAttribute from the Mailer component and recompile.
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I designed a class called Mailer that verifies passed strings holding email addresses against the Outlook Global Address List, and then uses simple SMTP protocol to send out email messages. This class was used as part of a larger project and I ran into this interesting error upon client use of the larger project. We sent an .exe of the larger project to a tech writer to document the software and when he attempted to run teh executable the program hangs all most immediatly. We beleive that it hangs right away due to the fact that in the larger project an object of type Mailer is being instantiated. We are fairly certain that this is the class that is throwing the exception on the client's machine. I am not sure of this helps but the client was running XP with the .NET framework 1.1, but .NET Development enviroment was not installed on this machine. Has anyone ever heard of a licensing error like this? We think it might have something to do with the MSMAPI.dll I am using in my mailer class. Thanks for your help, as a newbie I am not familiar with a lot of common or uncommon exceptions and how to go about fixing them.
Thanks again!
Frank Lepkowski
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This exception is usually associated with a class that is licensed. See the LicenseProvider, LicenseProviderAttribute, and related classes in the SDK docs for more information. Basically, your class was apparently marked with the LicenseProviderAttribute which referenced the type of a custom LicenseProvider. That license provider verifies that a client can - at either design-time or runtime - use the licensed class. The message you got is the default message used when a class is not licensed (i.e., whatever your license provider checks, your tech writer doesn't have it).
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I want to get the label of a local disk, using System.ManagementObject. The code below help me
to get out the name of each disk ("c:\", "d:\", ...), not the label of it.
ManagementObjectCollection queryCollection = getDrives();
foreach ( ManagementObject mo in queryCollection){
Console.WriteLine(mo["Name"].ToString());
}
How to get the label?
Thanks.
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You need to use "win32_logicaldisk" as your ManagementObject and use
"VolumeName" to get the info you need.
Regards,
Kannan
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Use the following WMI property ads illustrated...
Console.WriteLine(mo["VolumeName"].ToString());
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thanks.
But I want to know the full-list of propertyName of it.
VolumeName
Name
DriveType
...
and so?
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Hi
I need some help with some code i making. I´m making an FTP Server, an need to make a Socket were I can be listening for new connections. The problem is, that I can not use a static port number because, there will be many clients, and therefor I need a new port for each client connecting with a passive connection.
In other languages (java) you just make a new ServerSocket() with the portnumber 0, and then you´ll get a ServerSocket running on a new available port every time..
How can I do this in C#.... please help me - a FTP server which can only handle one passive connection at the time is not very efficient..
thx in advance
Søren
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It's almost as easy. Create a new IPEndPoint with the IPAddress to listen on and 0 for the port:
IPEndPoint ip = new IPEndPoint(IPAddress.Loopback, 0); In your case, you won't want to use the loopback for a server that accepts outbound connections, though.
Then, create your Socket and call it's Bind method, passing the IPEndPoint. You could, instead, use a TcpListener, passing the IPEndPoint into the constructor. This is geared more toward TCP servers, which , of course, FTP uses.
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Version: 3.21
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Thank you it worked.
Søren Christensen..
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Hi All,
I am building a web application and would like to know if I can request a "Read Receipt" for the mails I send from the application.
Basically my application will send mails to various addresses and I want to request "Read Receipts" to find out if the message was read and on what date.
I know that in asp using CDONTS, we can do something like "Disposition-Notification-To". I am seeking the C# and ASP.NET equivalent or better if possible, without using third-party components.
Thanks in advance.
Raj
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What are you using to generate the mail headers?
It should be possible to add either a "Disposition-Notification-To:" or a "Read-Receipt-To" into that easily enough.
Bear in mind, of course, that some sites have software that filters out one or more of these to stop spam.
Steve S
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My program is watching for a directory on any incoming file and then move it to other places. Another application produce the data file to that directory. The problem is: my program always get the error message:
access violation
So, how can I know from program point of view that the file is accessed by another process? Is there any related API? Thanks in advance.
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For files opened over a share, you can use NetFileEnum. For the local system, there is a function or two in the Win32 API but they are undocumented and unreferenced. There is a program called "handles" available at http://www.sysinternals.com/ntw2k/freeware/handle.shtml[^] that can show you open handles. I have examined this executable for the exports it uses but there are a lot of undocumented functions with somewhat ambiquous names.
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That's because C# (rather, the CLR) doesn't recognize the [optional] automation attribute like VB/VBScript does, and COM doesn't support overloads. If VB doesn't supply these optional parameters, though, defaults are used. These defaults for each parameter are documented so just pass those defaults for the parameters in C#. It'll have the same effect.
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hi, friends.
I want to ask how can I compose serval bitmaps or images into one image file?
suppose I have 2, 3, or 4 bitmap files, each file has the same contents but different color, now I want to compose them to one new bitmap. Is there any easy method or fast way to do this?
anyone has tried this application, please give me some idea... Thank you
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Read my image processing articles. Ultimately, you probably want to merge the pixel values and build a new bitmap.
Christian
I have drunk the cool-aid and found it wan and bitter. - Chris Maunder
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Ok this may or may not be possible and if it's possible then it may be so easy to do that I go and hide under the covers of my bed for asking such a stupid question but here goes.
Is it possible to create Attriobutes at runtime for a method or function. The main reason I want to do this is that I want to create an Attribute class that will work in a similiar way to the Obselete Attribute class. So my first question is - how does the Obsolete attribute work so that during compilation it causes an error if a function that has been created with the Obsolete Attribute and is then called from elsewhere in the code.
Secondly is it possible within the constructor of my attribute class to create an instance of the Obsolete attribute class and for this to then work the same way as if I had placed the Obsolete Attribute before the method/class/variable.
Thirdly can you create an Attribute at run time that you can apply to a method, in a similiar way that you can access what Attributes have been applied to a method.
Please note that where I have used method in this text please replace with Method/Class/Variable etc.
Thanks in advance if anyone has any information on this,
Mark
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Hi Mark. There are some articles on attributes here on CodeProject that you may want to check out (do a search for "attributes"). I particularly liked this one from sadaf alvi
http://www.codeproject.com/csharp/attributes.asp[^]
I haven't tried it, but it seems reasonable that an Attribute could be created at runtime... how would it be applied? I see the GetCustomAttributes method, but nothing to set them...
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