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chris fearnley wrote:
Has anyone else had similar experiences?
Nope, in fact the CLR is supposed to protected against this, and it's not like a socket listener application using ADO.NET is anything low-level enough to do something like this (and in fact, it's hard for any managed language to be low-level enough).
If you're P/Invoking code, then it's a different matter. In such a case, make sure you're marshaling parameters correctly and make sure you're not using out and ref keywords (unless the params are pointers to pointers) for reference types, including arrays of value types (since an array is always a reference type). On one occassion I did see someone's code which included this mistake unexpectedly unload the CLR (and hence crash the app) but never a BSOD. The last time I saw a BSOD was on XP with a bad Creative Labs driver (and aren't they all?). To note, I architect .NET solutions all the time and am responsible for many .NET programmers and developers.
Microsoft MVP, Visual C#
My Articles
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Same thing with me. I've doing .net development for few years now, and have never seem any crashes from it. It might be some bad driver on your machine. I've had similar crashes before (non .net development related) with display drivers for gforce video card.
How can you know it's your app crashing the system?
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It's happened on two machines (while running this app) and the machines have been fine at other times. Not much in common with them otherwise except both have XP pro and VS .NET loaded. They're different makes and they're not even in the same building!
Not using any interop services, only the Win32 serial port code as suggested by the JH:Combase class
[DllImport("kernel32.dll", SetLastError=true)]<br />
internal static extern IntPtr CreateFile(String lpFileName........ etc...
which I think I got from CodeProject but can't find now.
Thanks for suggestions so far anyway.
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Hi,
I load a hefty page of controls (loadcontrol), something that requires some time (business logic included). The click event of one of the webcontrols fires after the page_load has loaded all controls again.
Is it possible to handle the click of a webcontrol without having to load the whole set of controls again (if I don't load the control the click event will not fire)? Maybe with SENDER in page_load?
Regards,
Michel
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Dear Sir,
i am not sure but i think that you have to use some scripts to do the job in this web page cuse scripts works in the client side and in this case there are no need to reload all the web page controls
Regards
Mhmoud Rawas
------------
Software Eng.
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That's a part of the problem, we don't want extra client side script since we have webcontrols..
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Try overriding Page.RaisePostBackEvent and provide an implementation of IPostBackEventHandler that uses the information in the post back argument to simulate your control.
There would be a way, though. This isn't like in Windows Forms where the callback (event handler) points to a managed memory address on the heap. Post-back events all original from a simple HTTP POST with a little help from a small piece of client-side Javascript (__doPostBack).
Microsoft MVP, Visual C#
My Articles
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I have a program that runs as a service and needs to know when any user has successfully logged in.
Using the SystemInformation.UserName shows that 'this' process was stated by the 'SYSTEM'.
I have been forewarned about touching the security events by the end users IT management, so looking for a valid logon event with the current setting are out of the question.
Any ideas would be very much appreciated.
Rick
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A service always runs as the user under which it's configured to run. If your service is configured to run as SYSTEM, then it will always run as SYSTEM when the service is started (at startup if configured as such, which is the default behavior). Many services will implement APIs that impersonate users but still can only run as a certain account (like SYSTEM).
If you want to moniter when other users log in (since your service is continually running despites whether or not someone's logged in), then you need to monitor system events. The .NET FCL (Framework Class Library) exposes no such APIs, so you'll have to use unmanaged code through COM interop or P/Invoke.
If you're limited from checking security events, then you could use WMI and handle an event query for the Win32_LogonSession WMI class. The details are buried in Microsoft implementations and all you have to do is register to receive an event when something changes. See the class documentation for the System.Management namespace and see MSDN Magazine[^] for several good articles (including links to more information and a good WMI plugin for VS.NET's Server Explorer (beta for 2002, released for 2003 - but both work good).
Microsoft MVP, Visual C#
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Hello,
My name is Michael Davidov I am 17 years old and a junior in high school. I have been programming in C# since the .NET Framework was publically released. I want to teach a class at my highschool in Seattle about computers and programming and find no easier, or more useful language than C#. My school has never had any form of computer classes or anything remotely related to programming. It actually makes me quite upset considering it is a private school (Seattle Academy of Arts and Sciences)and every student has a nice win2k or XP laptop with a 802.11b connection.
What I really need is a book with lesson plans that other students can consult out of school when I am not available. I have recieved the go ahead to create such a class so I am in need of a text as soon as possible. Also any suggestions on how to GRADE assignments would be very welcome.
Thanks for your time!
Michael Davidov
( MichaelDavidov@seattleacademy.org )
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Sirusdv wrote:
Also any suggestions on how to GRADE assignments would be very welcome.
First, NEVER grade a student based on what they did compared to what you did. It's okay to put a little emphasis on how they accomplished a problem (there are good and bad ways and they should be encouraged for doing it in a good way). In college there were far too many professors that gave bad grades if you didn't do it "their way" (and in many cases some of us did it better). Good development is an art. Some people either have it or they don't and not everyone is cut out for it. In fact, most people in this field now don't belong here.
As far as picking out good books, you might consider visiting sites like http://www.efollet.com[^] and other sites that sell books for colleges. They often times sell the teachers manuals, too, although you might need a teacher at your school to get them. Some series require accreditation in order to get the teachers' manuals (otherwise dishonest students would have an unfair advantage). Others require that you get X copies of books and will send 1 or 2 teacher editions (my mom's a teacher so I've seen her go through this since she's responsible for college-level books).
Many of these types of books focus on how to develop rather than a specific technology, which is sometimes good. Since this is a private school (i.e., most students - or their parents - have $$$) you might consider a companion book that focuses more on a specific technology (like .NET - not necessary C# since it's only a language that targets the CLR, something most people seem to not realize). So many academic books out there are pretty vague and only trying them (which many offer) will tell you which ones are good and which aren't. (BTW, books from Dietel and Dietel seem pretty good and both beginners and intermdiate/advanced programmers seem to like them).
Hope this helps.
Microsoft MVP, Visual C#
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I found the best approach is to actually buy/look at several books and learn the content yourself and then simply go from the Hello World operation to wherever it takes you!
One thing i have found, if you teach using VS.Net drag and dropping every little thing and using properties people tend to thing an object is limited to its properties rather then looking at the msdn and learning about the objects! Which seems a very bad thing to me!
Personally I would try and teach them using as much hand written code as possible, this may initially sound bad but for their future it is very good as they will turn out as more technically skilled programmers then a drag and dropper!
Books I would reccomend to you... well I always go by something an old tutor said to me check the spines of your books the more worn out they are the more useful the book is!
Wrox Professional C# 2nd Edition 1-86100704-3
If you contact me I have some extra information which would be useful
as.thakor@ntlworld.com
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I am using an active-x component (AxMediaPlayer) to use microsoft mediaplayer on winxp platform. It works fine but I can't play wma files with license files. It seams The it can't find the license on my computer, and the Internet Explorer is opend on the following page: http://relicensing.od2.com/emailaddress.asp?strISO639=eng&strTransProcID=1A20TH0076519669.
How can I tell the AxMediaPlayer that I have the rigth license.
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Hii
I want to downlaod a picture using my application.
I am able to download html pages. can u please tell me how to download picture.
i am using this code..
HttpWebRequest webRequest;
webRequest = (HttpWebRequest) WebRequest.Create
("http://www2.indiaresult.com/Uttar_Pradesh/uptech/Rollquery.aspx?id=1116&linkid=NRollNo&rollno=01035" + j.ToString ());
HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse ();
StreamReader sr = new StreamReader (webResponse.GetResponseStream(),Encoding.ASCII );
x = sr.ReadToEnd ();
StreamWriter writer = new StreamWriter ("c:\\results\\"+ YearCollegeCode + j.ToString ()+".html",false);
writer.Write (x);
sr.Close ();
writer.Close ();
please help me.
Thank u
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Well, the problem is that I fill a dataSet and in some functions I change the informacion of its Tables, but letter I want to return the data of one Table to the dateBase that it procced.
It's important because with it I'll only make two requests to a DataBase, to take the information and to put new information.
Thanks...
.............................
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please make your question more clear as i dont understand!
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See the DataAdapter derivative classes. You can use DataAdapter.Update (so long as the InsertCommand, UpdateCommand, and DeleteCommand properties are assigned) to update the database. If you plan ahead, keep the instance of the DataAdapter that filled your DataSet with fully-assigned properties that can fetch and update data.
Microsoft MVP, Visual C#
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Hi,
Can someone please help me, I have spend many hours trying to solve the problem...
I have an inherited TextBox control to which I added a custom bool property with Bindable(true) and DefaultValue(false) attributes. Using the IDE, the property is bound to a column in a Table within a DataSet. The databinding works fine.
The problem, during the form layout the 'Set' accessor of the property is mysteriously called with 'false', which seems to set the 'IsEdit' flag on the CurrencyManager for the row, forcing an update of the row while no data has actually changed.
Is there a way I can prevent this from happening?
Yours Sincerely
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Both BindableAttribute and DefaultValueAttribute are design-time attributes. They will not do anything for you at runtime. The former is used to put the property directly in the "Bindings" catagory instead of having to click on "..." in the "Advanced" design-time property. The latter is used by the designer to know when to serialize the property value and when not to. The specially named ShouldSerialize<PropertyName> is also helpful for this.
If your property is getting set mysteriously to false, put a breakpoint in your code and examine the stack trace. That will tell you what caller is calling your set accessor.
Microsoft MVP, Visual C#
My Articles
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Thanks, I will try your suggestions.
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Hi, is there anyway to make a TrackBar Control transparent? Ive tried all sorts of thing like for example:
this.SetStyle(ControlStyles.SupportsTransparentBackColor | ControlStyles.Opaque, true);
this.BackColor = Color.Transparent;
And I've tried setting the WS_EX_TRANSPARENT extended style:
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= WS_EX_TRANSPARENT;
return cp;
}
}
None of which works. Does anyone have any suggestions for me?
Thanks, Dan
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From MSDN for SupportsTransparentBackColor :
The control accepts a BackColor with an alpha component of less than 255 to simulate transparency. Transparency will be simulated only if the UserPaint bit is set to true and the parent control is derived from Control.
Have you set it to true?
Mazy
"Man is different from animals in that he speculates, a high risk activity." - Edward Hoagland
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Thats no good, if I set UserPaint the Control will become invisible because its expecting me to paint it.
Dan
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maybe you can just call the default paint function after setting the transparency of the tool bar ?
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