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Hello again!
Now the error is not showed (thanks! =)) but, nothing is added to the combobox =/. When the application starts I can hear a: (the floppy drive) but it is not added to the combobox and neither is anything else =/
~~~~~~~~~~~~~~
Martin Lundberg
Student, Sweden
I have to thank every member of the Code Project for making it such a great place for a beginner to learn!
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Found out why, I had not named my disks, but still in Explorer they look like: Local Disk (C , Local Disk (D , etc.
Should I get what kind of disk it is, and then if volume is empty add like Local disk, myself or is local disk something else then "VolumeName"? =)
Thanks in advance!
~~~~~~~~~~~~~~
Martin Lundberg
Student, Sweden
I have to thank every member of the Code Project for making it such a great place for a beginner to learn!
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You'd best get the drive letter and optionally get the name. What you see by default in Explorer is the drive type.
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Software Design Engineer
Developer Division Sustained Engineering
Microsoft
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Hello!
But the DriveType I get by using ["DriveType"] is an int meaning different stuff like: 2 = Removable disk, 3 = local disk, 5 = compact disk. In Explorer it diferences from CD and DVD. I've got a swedish version of winXP so I'm not really sure what it says in the english ones.
~~~~~~~~~~~~~~
Martin Lundberg
Student, Sweden
I have to thank every member of the Code Project for making it such a great place for a beginner to learn!
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Your subject reads "Getting the volume names of disks", so why do you care about the drive types? To accurately get the drive types you should be using a different set of APIs that encapsulate getting the drive type based on what media is in there. These require P/Invoke and can be found in the "Windows Management" section of the Platform SDK, available for download or you can find the documentation online at http://msdn.microsoft.com/library[^].
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Software Design Engineer
Developer Division Sustained Engineering
Microsoft
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Sorry that I was confused from start (and still am). I thought that what I saw was the Volume names. I've been trying to find the Windows Management and P/Invoke section. I've found the Windows Management Instrumentation (WMI) but still not P/Invoke or how to get the srive types. I'll search some more, thanks once again for the help! =)
Edit: I found something here: http://www.dotnet247.com/247reference/msgs/19/99154.aspx I have not tested it yet but it uses P/Invoke so it may be what your talking about.
~~~~~~~~~~~~~~
Martin Lundberg
Student, Sweden
I have to thank every member of the Code Project for making it such a great place for a beginner to learn!
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The volume names are what you use to read/write from/to the volume, like C: or A:, or - if it has specified an actual volume name (like I name my root drive with Windows installed on it "System") - it is the name given to the volume. The API you found in that post - GetVolumeInformation - explains it quite well.
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Software Design Engineer
Developer Division Sustained Engineering
Microsoft
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Can someone show me C# code to save and get an image data from/in a mdb database.
Please i can't use SQL SERVER code or VB.NET code, thanks.
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How can I have codebehind file for global.asax file and how to reference it in global.asax as I want to execute some application start up code in Application_Start so I can access global variables like Global.HostName, Global.portalName and so on.
I am using VS005 beta1 - TecheEd 2004
REgards.
MaulikCE.
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Whidbey (.NET 2.0) introduced partial classes, which allow a class to be defined by two different source files. VS Whidbey (VS 2005) uses this to replace code-behind files.
To see hidden files like the partial classes (also used by forms designers to separate user code from designer code), click the Project -> Show Hidden Items (or something similar - I don't remember the exact text off-hand) menu items while a file in your project is selected.
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Software Design Engineer
Developer Division Sustained Engineering
Microsoft
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I have tried with "Show all files" and "Refresh" button in the solution explorer but couldn't see the form designers' codebehind and global.asax.cs...
Here's my story:
VS 2005 doesn't offer global.asax file, when I create File>New>Website...So, I have tried adding it mannually..So, I went to Add new item...so, it shows visual studio installed templates...I selected "Global Application Class"...but what's this!!!! ( Place code in seperate file checkbox is already disabled ) So, I have to have acccept inline coding ( it gives Application_start, Session_start in global.asax file itself) but I want sepearate class i.e. codebehind file..
Any help regarding this would greatly be appreciated!!!
REgards
MaulikCE.
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You'll need to define a class that extends HttpApplication in your project and set the Inherts attribute to that fully-qualified class name:
<%@ Application Language="C#" Inherits="MySite.Application" %> You can then code in a separate file, although I wonder why. Whidbey extends IntelliSense to server-side script and the class is still compiled when parsed. You can even pre-compile an entire site, now. See ASP.NET 2.0 Internals[^] for this and more information.
For a look at the differences between tradition "code-behind" and how it will work in Whidbey, see ASP.NET 2.0 Compilation Model Changes[^].
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Software Design Engineer
Developer Division Sustained Engineering
Microsoft
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Thanks Heath, I have tried to apply what I can perceieve from your comment but It constantly gives build error - "Could not load type 'MySite.Application'."...Its tiresome!!!
So, At last I have decided to put all code here rightaway(though I feel its bad), so you can throw some light where I am making mistakes in adapting Whidbey...
//Applicaiton class
<br />
using System;<br />
using System.Web;<br />
<br />
public class Application: HttpApplication<br />
{<br />
public Application()<br />
{<br />
}<br />
<br />
public void Application_Start(Object sender, EventArgs e)<br />
{<br />
<br />
}<br />
...<br />
}
Here's the only line I have in global.asax
<%@ Application Language="C#" Inherits="MySite.Application" %>
I have even tried, <%@ Application Language="C#" Inherits="Application" %> but same error!!!
REgards.
MaulikCE..
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"MySite.Application" is what you're supposed to replace. If you read the documentation for the @Application element, the Inherits attribute is the namespace + class name. Whatever namespace you use for your code you must add before Application, as you've defined your class.
I still recommend you use the file itself. You still get IntelliSense and you can compile the entire site using the links I gave you. If it's a matter of protecting your code 1) a developer could easily use something like ildasm.exe or ".NET Reflector" or any other disassembler or decompiler to see your code, or 2) simply change the Inherits attribute to point to a different type if you're concerned about security (and remember that security through obscurity is no security at all).
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Software Design Engineer
Developer Division Sustained Engineering
Microsoft
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Thanks again Heath,
well "MySite" is the dummy website I have created and I dont see the namespace keyword in newly created website - "MySite"...What I have is one default page with declaration like "public partial class" enclosed by no namespace declaration thats why I have tried applying "Application" and "MySite.Application"...
Its great to hear security stuff and vulnerability of .NET from ildasm. Anyways let me cleary stat the problem.
problem:
Presently I have full fledged portal based web application running up and fine in VS2003. There I have my global.asax.cs which does some processing in global events and sets few variables of this class to name, "ConnectionString", "hostpath" and many more, so can easily be accessed in all pages by Classname.VariableName (global.ConnectionString)...And this application also does initliazation of 2-3 classes in global events..
So, I need to have 2 things in inline scripting i.e. writing all code in global.asax),
1) Setting public variables as I said for Connectionstring, so I don need to change code in all my pages which currently references them with "global.Variable" way
2) Inititalizing other classes from global events..
I think main problem is "Codebehind" attribute which is taken away in Whidbey, And I think what you are saying could be an workaround to my problem. If it works then my last question would be "Is it true that you cant have codebehind feature with global.asax which's being considered a great boon to ASP.NET against ASP?"
Look forward to hearing from you.
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Things written below are with respect to "Whidbey"
So, I need to have 2 things in inline scripting i.e. writing all code in global.asax),
1) Setting public variables as I said for Connectionstring, so I don need to change code in all my pages which currently references them with "global.Variable" way
2) Inititalizing other classes from global events..
I think main problem is "Codebehind" attribute which is taken away in Whidbey, And I think what you are saying could be an workaround to my problem. If it works then my last question would be "Is it true that you cant have codebehind feature with global.asax which's being considered a great boon to ASP.NET against ASP?"
REgards.
MaulikCE
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The default namespace for a file in C# (which works differently than VB.NET in this regard) is the combination of the root project namespace you can find in the Project properties plus any folders you define. Of course, in C# you can change the namespace regardless of the location or even the project root namespace, unlike VB.NET that combines these things in the same way but in a cummulative manner, meaning that you never repeat the root or parent namespace in a source file otherwise you'll get a much longer, practically doubled namespace!
"Code-behind" wasn't removed in Whidbey, it was redefined to use partial classes instead of the previous method, which was multiple inheritence. The page (.aspx file) inheritted from the code-behind class, which inheritted from the Page class. Scary, and an unnecessary burden on the CLR.
Both goals could be solved by using another class, perhaps called Globals (seems to be common), rather than overloading the HttpApplication class unnecessarily. Since any changes to Web.config for the application (in the application root) or certain other events will tear down the AppDomain, you must make sure you re-initialize your properties correctly. Pretty much any way you do it will work.
If you don't need global.asax don't use it. This wasn't nearly used as much as originally intended (I gather) which is probably why it was removed from the default project files.
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Software Design Engineer
Developer Division Sustained Engineering
Microsoft
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Hi all 
I am C# programmer.. For my project i want to create a textbox like in Mspaint,which restrict the entering of characters upon reaching the Size.
I tried with MeasureString.. But not works
Pls tell if anyone knows how to do it..
Warm regards
Krishnan
If u can Dream... U can do it
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MeasureString is graphics, which is why it's defined on the Graphics class. To limit text in a TextBox, you can post-validate the control (which fires when the focus is lost for that control) by handling the Validating event. If you want to limit which characters will even work, override the IsInputChar method for the TextBox:
public class NumericTextBox : TextBox
{
protected override bool IsInputChar(char charCode)
{
return charCode >= '0' &&charCode <= '9';
}
}
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
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In my case i want to know how many charcaters can be enter in the textbox . How it can be know. So when reaching that number i can disable entering characters..
The problem here is to find the number of characters that can be enter in the text box (No scrolls)..
What u think ?
Regards
Krishnan
If u can Dream... U can do it
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The MaxLength property of the TextBox lets you set a maximum number of characters that the user can enter, no matter the width (it can be 10 m's or 10 i's).
But if you set the TextBox to be, say, 100 pixels wide, and you want only 100 pixels of letters, be it 5 m's or 8 i's, it's a bit more difficult. As an option, try using the MaxLength property and making the TextBox wide enough.
But if you absolutely need to allow only a certain width of characters, try getting the font of the control, and using some graphics function (MeasureString could be, I am no expert.) to measure the current contents plus the new character in the KeyDown event, and if the new text is wider than the control, don't accept the key.
I hope to have given you some pointers. Good luck!
-- LuisR
Luis Alonso Ramos
Intelectix - Chihuahua, Mexico
Not much here: My CP Blog!
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Hey, for some reason I'm having trouble trying to figure out what the best practice would be for my situation. Let me explain my situation and then I'll explain where I'm stuck. I'm creating a skinning engine, somewhat like Winamps. It uses xml as the "scripting language", I then parse the xml into objects. Heres a simple XML of what a script might look like...
<code>
<pre> <skin_info>
<name>acDesk Default Skin</name>
<version>1.0</version>
...........
</skin_info>
<element id="main_window" source="main_window.xml" />
..............
<element id="tab_strip" source="tab_strip.xml" /></pre>
</code>
I would then parse the skin.xml into an object called SkinDocument wich has all the info in the skin_info node and a collection of SkinElement objects defined by the element tags. The SkinElement then looks at the source file of the element and parses that into SkinComponents (layers, buttons, etc..).. heres what an element source file looks like...
<code>
<pre><!-- Set the properties for this window -->
<setproperty id="folder_path" value="main_window" />
<setproperty id="size" value="205,437" />
<setproperty id="minsize" value="205,437" />
<setproperty id="transkey" value="255,0,255" />
<!-- Create the border layers -->
<layer id="top"
location="0,0"
width="$WIN_WIDTH"
height="5"
image="top_bar.png" /> <!-- This is a SkinComponent -->
<layer id="left"
location="0,0"
width="5"
height="$WIN_HEIGHT"
image="left_bar.png" />
<layer id="right"
location="0,compute($WIN_WIDTH - 5)"
width="5"
height="$WIN_HEIGHT"
image="right_bar.png" />
............
<!-- Create the title bar buttons container -->
<container id="title_buttons" location="compute($WIN_WIDTH - {$WIDTH}), 5" width="autosize-left" height="autosize-down" padding="5">
<button id="close_button"
width="10"
height="10"
action="CLOSE"
toolTip="Close acDesk"
image_strip="close_button.png" />
<button id="minimize_button"
width="10"
height="10"
action="MINIMIZE"
toolTip="Minimize acDesk"
image_strip="minimize_button.png" />
</container>
<!-- Create the content container -->
<container id="content"
location="5,5"
width="compute($WIN_WIDTH - 5)"
height="compute($WIN_HEIGHT - 5)"
padding="0"
source="$WORKSPACE" />
............</pre>
</code>
So, now theres a little background of what I'm doing. And heres my issue.. I'm going to be creating a UI to work around these objects, IE: SkinForm, SkinProgressBar, SkinPanel, etc.. So I need these objects to be exposed only internally, BUT anyone using this component will need the ability to "hot-swap" skins. They might not have access to the internal library to access these objects. So this forces me to make most of them public. My problem with this is that I don't want users to be able to "screw" with the skin. I don't know what some people might do, and I don't wanna even give them the chance to add SkinElements, SkinComponents, etc... at run time. So what I'm thinking of doing is creating another object called SkinManager wich will act as a wrapper for these objects. Then make all the other objects internal only. The SkinManager would contain only static fields so that it could be accessed across a whole application without having a crap load of instaces being created and alot of parsing going on. My question to everyone is what is the best practice here? Should I make all the object public and trust the user won't mess with the skin at runtime and trust they will create their own manager so that they aren't parsing everytime a skin UI object is loaded, or should I go with the SkinManager idea? Maybe both? Any help is appreciated! Thanks in advance!!!
BTW: This is going be under the GPL license, so anything I do will prolly be changed and made better down the road by someone else 
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Ignore those <pre> tags.. I was trying to get the forums to show the xml as code, but yet still allow the use of < and > for html code (ie: <code>) 
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