[C# & ASP.net] Control instances as null - C# Discussion Boards

jgallen231-Feb-06 20:58

1-Feb-06 20:58

Can you give me some tips as what to look for? I haven't done c++ in about 5 years. I'm guessing I can't use any controls and I'd have to render all text in gdi or use images like rainlender.

Re: Transparency (like Rainlendar)

Dave Kreskowiak2-Feb-06 1:54

Dave Kreskowiak

2-Feb-06 1:54

Probably something to do with Layered and Transparent windows. Also, modifications to the windows EXSTYLE (Extended Style) attributes, like Alpha and ColorKey.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Quick Threading Question

Mr. Rogers1-Feb-06 13:02

Mr. Rogers

1-Feb-06 13:02

How do you spin a process off onto another thread and wait for it to complete? I'm looking for something like when you call ShowDialog and the process stops until the dialog has been closed.

Re: Quick Threading Question

S. Senthil Kumar1-Feb-06 13:21

S. Senthil Kumar

1-Feb-06 13:21

You are looking for the WaitForExit[^] method on the Process[^] class.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: Quick Threading Question

Mr. Rogers1-Feb-06 13:33

Mr. Rogers

1-Feb-06 13:33

Cool, thanks. I'll take a look at it.

Re: Quick Threading Question

Mark Greenwood1-Feb-06 13:54

Mark Greenwood

1-Feb-06 13:54

If your question was how to kick off a seperate process (e.g. another application) from within you current program then the previous answer will be the key, however it looked from your question as if you wanted to kick off a seperate THREAD from within your program, in that case you would create a new thread, start it off and then call Join to wait for it to finish.

e.g

<br />
ThreadStart ts = new ThreadStart(StartExtrapolation); // Name of some void function<br />
Thread thThread = new Thread(ts);<br />
thThread.Start();<br />
thThread.Join(); // Can take a timeout variable as well if you want<br />
<br />
// Any code after this will either happen after the thread has finished or if a timeout occured<br />
<stuff><br />

Re: Quick Threading Question

Mr. Rogers2-Feb-06 5:18

Mr. Rogers

2-Feb-06 5:18

Yeah, a separate thread yes. I've known how to start different threads and whatnot, just didn't ever know how to wait for one to finish without some kind of event. Thanks.

[C# & ASP.net] Control instances as null

Distinctive1-Feb-06 12:19

Distinctive

1-Feb-06 12:19

This is part of a class libary that I am creating for a web site. I've created a class for a HtmlGenericControl that I want to use on my pages. It creates a box object that I can format easily (via the use of built in methods) and use on my ASP.net web site.

I've created the class, and it all compiles correctly, I can set it's properties and access it's methods, but when I create an instance of the class and try to add the control to the page I get a "null object" error.

Here's my code for the object:

	/// <summary><br />
	/// Creates a customisable content box for use on the page<br />
	/// </summary><br />
	public class ContentBox : HtmlGenericControl<br />
	{<br />
		// The top container of the box<br />
		HtmlGenericControl BoxTop;<br />
		// The header "h2" tag<br />
		HtmlGenericControl BoxHeader;<br />
		// The bottom container of the box<br />
		HtmlGenericControl BoxBottom;<br />
<br />
<br />
		/// <summary><br />
		/// Gets or sets the header text in the box<br />
		/// </summary><br />
		public string BoxHeaderText;<br />
<br />
		/// <summary><br />
		/// Control collection for the inner content of this box<br />
		/// </summary><br />
		public HtmlGenericControl BoxContent;<br />
<br />
<br />
		// Css class of the box<br />
		string BoxStyle;<br />
		/// <summary><br />
		/// Change the box type to wide content box<br />
		/// </summary><br />
		public void SetToContentWide() { BoxStyle = "box-wide"; }<br />
		/// <summary><br />
		/// Change the box type to left side content box<br />
		/// </summary><br />
		public void SetToContentLeft() { BoxStyle = "box-left"; }<br />
		/// <summary><br />
		/// Change the box type to right side content box<br />
		/// </summary><br />
		public void SetToContentRight() { BoxStyle = "box-right"; }<br />
		/// <summary><br />
		/// Change the box type to a sidebar box<br />
		/// </summary><br />
		public void SetToContentRightSidebar() { BoxStyle = "box"; }<br />
<br />
<br />
		// Box header css class<br />
		string BoxHeaderStyle;<br />
		/// <summary><br />
		/// Changes the header to dark green to stand out<br />
		/// </summary><br />
		public void SetHeaderImportant() { BoxHeaderStyle = "header"; }<br />
		/// <summary><br />
		/// Changes the header to dark green to stand out<br />
		/// </summary><br />
		public void SetHeaderNotImportant() { BoxHeaderStyle = "top"; }<br />
<br />
<br />
		/// <summary><br />
		/// Initialise the box<br />
		/// </summary><br />
		public ContentBox()<br />
		{<br />
			// Set default values<br />
			BoxStyle = "box-wide";<br />
			BoxHeaderStyle = "header";<br />
			BoxHeaderText = "";<br />
<br />
			// Set up this box<br />
			this.TagName = "div";<br />
			this.Attributes["class"] = BoxStyle;<br />
<br />
			// Create the box top<br />
			BoxTop = new HtmlGenericControl("div");<br />
			BoxTop.Attributes["class"] = BoxHeaderStyle;<br />
			this.Controls.Add(BoxTop);<br />
<br />
			// Header for the box<br />
			BoxHeader = new HtmlGenericControl("h2");<br />
			BoxHeader.InnerText = BoxHeaderText;<br />
			BoxTop.Controls.Add(BoxHeader);<br />
<br />
			// Create the bottom of the box<br />
			BoxBottom = new HtmlGenericControl("div");<br />
			BoxContent = new HtmlGenericControl("div");<br />
			this.Controls.Add(BoxBottom);<br />
		}

When I add the box to the page I simply use:
ContentBox _thebox = new ContentBox();
I can create an instance of the class, I can access it's methods, I can set it's properties, but when I try and use it on the page I get a null object error.

I think that the problem is that although when I create an instance of the class "ContentBox" it isn't being created as a new HtmlControl, but rather a null object.

Can anybody tell me how I get the object itself to become a new HtmlGenericControl when I create an instance of it?

Thanks

Re: [C# & ASP.net] Control instances as null

Distinctive2-Feb-06 0:18

Distinctive

2-Feb-06 0:18

Ok just so I can clarify this.

When I defined the class, I defined it as a an extension of the "HtmlGenericControl" class (as you can see in my above code). I want it to behave like a HtmlGenericControl, I want to manipulate it like a HtmlGenericControl, I basically want it to be a regular HtmlGenericControl.

Since "ContentBox" inherits from the "HtmlGenericControl" class I assume that I am just missing some code that will make the system initialise it as a regular "HtmlGenericControl" (eg. "InitializeComponent()" ).

That's the info that I'm after, how do I tell ASP.net to initialise instances of the class "ContentBox" as a "HtmlGenericControl", so that I can treat it as a HtmlGenericControl in my application?

Thanks

VS 2005 C# Class Wizard - it is gone?

LuluSailor1-Feb-06 11:58

LuluSailor

1-Feb-06 11:58

VS 2005 C# Class Wizard - it is gone? Should I be able to use the class wizard or is it no longer an option?

Re: VS 2005 C# Class Wizard - it is gone?

James Gupta1-Feb-06 21:01

James Gupta

1-Feb-06 21:01

I think they removed it in the Express editions to be honest

SQLDMO for Oracle

sam3151-Feb-06 11:42

sam315

1-Feb-06 11:42

Is there an SQLDMO like product for Oracle? I want to be able to manage tables and views from C# code.

Thanks.

Using delegates with remoting in .net 2.0

Oyvind Hansen1-Feb-06 11:22

Oyvind Hansen

1-Feb-06 11:22

Hi.

I'm trying to hook on to an event which my remote object provides. client and server share the same common library where the event and delegate is defined in an interface.

Anyway, the remoting works, but when I try to use delegates (+=), I get the following message:

"Type System.DelegateSerializationHolder and the types derived from it (such as System.DelegateSerializationHolder) are not permitted to be deserialized at this security level."

I've been searching a lot and see that in 1.1 this could be fixed by setting the 'typeFilterLevel=Full'. However, I can not figure out to set this in .net 2.0 as the 'RegisterChannel' method has changed

Remove a Child Entry from AD

osamahmirza1-Feb-06 10:54

osamahmirza

1-Feb-06 10:54

Hi all,
I am very new to DirectoryServices. I created an ActiveDirectory user by using DirectoryServices. I can find that added entry later-on aswell. But I still couldnt figure out that how can I delete an added user later.

I tried
DirectoryEntries.remove("username", DirectoryEntry.SchemalClassName);
as mentioned on MSDN, but its keep on givng me an error like:
Invalid DN name assigned
Can anybody help me?

Thanks in Advance!!!!

Controlling the focus

3Dizard1-Feb-06 9:27

3Dizard

1-Feb-06 9:27

Hi,
I have a form and I don't want it to get focus. Is there a possibility with .net (like setting the focus to a certain window) or do I have to use the win32 api? I'm using visual c# 2005 express edition, so I could make use of .net 2.0.
Thanks

tabcontrol glitchy

jasonmog1-Feb-06 9:26

jasonmog

1-Feb-06 9:26

my tabcontrol's selectedindexchanged event handler runs some code and if an exception is thrown, i set my selectedindex to 0 (the first tab page). but only the tab changes, not the page. the page remains on what was originally changed to. what is going on? i also tried .selectedtab = tpStart; and .selecttab(0); which produces the same weird effect.

Re: tabcontrol glitchy

Mark Greenwood1-Feb-06 13:47

Mark Greenwood

1-Feb-06 13:47

Hmmm not sure why this failing for you - I created a very simple little application and within the SelectedIndexChanged event handler I created an exception and then reset the Tab index to zero and it worked ok.

I have had a look at the System.Windows.Forms.Tabcontrol DLL using Reflector and it seems that the Windows message for SelectedIndexChangING is handled and not passed on so you could override the WndProc for a derived Tab control and handle the code which could potentially cause an exception by trapping the SelectedIndexChanging message and only pass it on to the base Wndproc if no exception was thrown.

Alternatively stick up some code and lets see if there is anything obviously wrong with the code.

Mark.

Re: tabcontrol glitchy

jasonmog2-Feb-06 2:48

jasonmog

2-Feb-06 2:48

the tab it self switches fine. stick some controls in each tab page and you'll see the tab resets to index 0 but not the page. the code i had was simply a tab control, a button, and a label in each tab page. the button click event does "tabControl1.SelectedIndex++;" and the tabcontrol's selectedindexchanged event does "tabControl1.SelectedIndex = 0;" clicking the button or the second tab switches to the first tab as expected and as function but the tab page panel is still at tab page 2. this same code worked fine and also switched the tab page in visual studio 2003, but now in 2005 it does not. however, i found a workaround. visual studio 2005 has a Selecting event for tabcontrol and responds appropriately when setting SelectedIndex to zero. not to mention i can conditionally cancel a tab change Big Grin | :-D

Aproximate string matching

Elvio Fernandez1-Feb-06 9:14

Elvio Fernandez

1-Feb-06 9:14

Hi,

I'm working on aproximate string matching detecting trademark similarity. I use NGrams, Lev, Editex and
Longest Common Substring algorithm. Recently I find a set of records from another system based on trademark
watching too. The set of records looks like:

(ASELTIN,SLTN,AEI,AEILNST,AS,IN)
(AMBERLITE,MBRLT,AEIE,ABEILMRT,AM,TE)
(ABBEI,B,AEI,ABEI,AB,EI)

where first field is the real trademark name, third field vowels letters, second non vowels, fifth field
are first two letters of trademark and sixth two ending letters.

The fourth field I think is all letters (no repetition) sorted in ascending order.

How can I use this scheme for detecting similiarity??

One way could be take word A and B and use vowels and non-vowels letter with Levenshtaein algorithm.
Like this:

float sim(string wordA, string wordB)<br />
	{<br />
<br />
	  string AVowels = extractVowelsFrom(wordA);<br />
	  string BVowels = extractVowelsFrom(wordB);<br />
	  int distance = Levenshtein.distance(AVowels,BVowels);<br />
<br />
	  // Same idea for non-vowels<br />
	  ...<br />
	  ...<br />
	  <br />
	  // procces and return some metric<br />
	  ...<br />
	  ...<br />
	  return metric;<br />
	 }

this is fine im working on it, but,
How can I use the fourth field (all letters no repetition sorted in ascending order) for detect similarity??
Any idea???

Thanks in advance

Elvio Fernandez

Re: Aproximate string matching

Ingo1-Feb-06 21:39

Ingo

1-Feb-06 21:39

I think there are some ways you can use this information for detecting similiarity.

There are some factors, if there are enough fullfilled, you accept this as a string matching:
- beginning of the word / ending of the word
- are all vowels in the word
- are all nonvowels in the word
- order of vowels correct / order of nonvowels
- length of the word (+- 1)
- are all letters matching

These are 8 possibilities. If you check the word, you want enough to be right. For example:
(AMBERLITE,MBRLT,AEIE,ABEILMRT,AM,TE)

AMBRELITE is ok. All 8 factors are ok. So you suggest the word is Amberlite. If someone writes Amberlit the beginning is ok, are all nonvowels are in there the vowels are in correct order (even one is missing), the nonvoewls are in correct order, the length of the word is nearly the same and alle th letters are matching ABEILMRT. You would suggest this is the word Amberlite.

The question is how to weight this factors and how many must be fullfilled (weighted). I don't work on string matching, but without any further background I would weight is like:
3 points for (beginning of the word / ending of the word) if one is missing two points for the other.
5 points for (are all vowels in the word / are all nonvowels in the word) if one is missing 3 points for the other
5 points for (order of vowels correct / order of nonvowels) if one is missing 3 points for the other. If a letter is missing than the fact is still fullfiled
3 point for (length of the word) substract 1 point for each extra or missing
1 point for all the letters are matching

This would be 17 points. Perhaps you must accept when there are 12 points (but this have to be testes out).

Greetings,
Ingo

Re: Aproximate string matching

Elvio Fernandez2-Feb-06 17:52

Elvio Fernandez

2-Feb-06 17:52

Hey Ingo,

Thanks for your time. I will test it!!

Elvio Fernandez

Additional C# 2005 Code Snippets From Microsoft

Kevin McFarlane1-Feb-06 8:46

Kevin McFarlane

1-Feb-06 8:46

http://msdn.microsoft.com/vstudio/downloads/codesnippets/default.aspx[^]
This more-or-less matches the additional snippets that VB got out of the box.

Kevin

Crystal Viewer 9 RDC

Bedevian1-Feb-06 8:33

Bedevian

1-Feb-06 8:33

here is my code

CRAXDRT.Application crxApp = new CRAXDRT.Application();
CRAXDRT.Report crxRpt = new CRAXDRT.Report();
crxRpt = crxApp.OpenReport(@Application.StartupPath+"\\Report_1.RPT",null);
string myExportFile = Application.StartupPath+"\\Report.txt";
crxRpt.ExportOptions.DiskFileName = myExportFile;
crxRpt.ExportOptions.FormatType = CRAXDRT.CRExportFormatType.crEFTText;
crxRpt.ExportOptions.DestinationType = CRAXDRT.CRExportDestinationType.crEDTDiskFile;
crxRpt.ExportOptions.RTFExportAllPages = true;
crxRpt.Export(false);

after i export, i want to close the crxRPT and crxApp object.
because i want to copy the latest database from the server to the my PC but i can't because these object are still connected to the database

i try this but didn't work.
crxRpt = null;
crxApp = null;

Saving and viewing XML Files

StevieGowland1-Feb-06 8:24

StevieGowland

1-Feb-06 8:24

Can anyone give me any guidance on how to store details from a windows form, entered via user input, into an XML file and then display those details to a DataGrid in the form of a table?

Also, how do I populate a drop down menu with a list from an XML file?

Steve G

Re: Saving and viewing XML Files

malharone1-Feb-06 11:23

malharone

1-Feb-06 11:23

Btw, the code below was typed directly into this textbox.. it is prone to have syntax/compilation errors!

<br />
XmlDocument xd = new XmlDocument();<br />
xd.Load("c:\\myxml.xml");<br />
foreach (XmlNode xn in xd.SelectNodes("/Root/Item"))<br />
{<br />
   myForm.myCombo1.Items.Add(xn.SelectSingleNode("@ItemNumber").InnerText);<br />
}<br />

To store user values in Xml document you may use XmlTextWriter

XmlTextWriter xtw = new XmlTextWriter("c:\\output.xml");<br />
xtw.WriteStartDocument();<br />
xtw.WriteStartElement("MyRoot");<br />
xtw.WriteAttributeString("UserName", myForm.textBox1.text);<br />
xtw.WriteEndElement();<br />
xtw.WriteEndDocument();<br />
xtw.Close();

- Malhar

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