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There is:
DateTime a = new DateTime(2004, 11, 15, 12, 30, 15, 22);
DateTime b = new DateTime(2004, 11, 15, 13, 33, 15, 22);
double minutes = ((TimeSpan) (b - a)).TotalMinutes;
www.troschuetz.de
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Hi,
I developed a User Control (B) that inherits from another User Control (A).
At first, the control worked fine. Thus, I continued development.
Currently, the control (B), that I initially dragged on the form in the test app, still works.
However, when I try to drag an additional instance of the same control to the same form, I get the error "Object reference not set to an instance of an object", showing on the form a picture saying "System.NullReference" with a red icon with a white cross.
When I try to drag the control to a new test project's form, I get this same error.
Still, the original instance I dragged on the form still works. When I step through that control, I can see that in the constructor all values are initialised to the intended values.
The user control (A), that the null-reference user control (B) inherits from, still works fine; I can still drag additional instance of that control (A) to my form without problems.
Both controls do not contain other controls; I just draw things on them and react on mouse actions.
I don't understand why this user control claims to be a null reference, when I drag a new instance on the form, while the initially created instance of the same control, referencing the same source code, still works.
Closing down the developer environment and restarting it, didn't help either.
Has anyone else experienced a problem like this?
Regards,
Jannigje
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I've had cases like this as well. It sounds like there may be an issue with versioning. What happens if you remove the <@Register> tag and references for the control, then re-add them to your containing page?
It may be easier (during development) to add the controls manually by editing the HTML until the control is stable.
The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!' ('I found it!') but 'That's funny...’
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I had tried that, too, several times, without any effect.
After adding a try-catch in my OnPaint, I could run it without problems and it worked at run-time, but it still displayed with an error on my form in design mode.
Then, while, again, checking if all properties had been intialised - without doing any changes (as far as I know), the control suddenly displayed on the form in design mode, as it should.
I've got the feeling that it has something to do with the initialisation of some value. While the value is wrong, it cannot draw anything in design mode (and, apparently, gives a null reference), but at run time, the value is filled in and no problems occur. Still, all values seem to be properly initialised in the constructor.
Strange...
Jannigje 
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Are u sure u are not making any reference to the control's parent|container in the contructor?
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when set c#(windows2000) form`s FormBorderStyle=None,and run the application,it show in appbar only with application name ,why no applicaiotn icon?
How can i reset the icon and with FormBorderStyle=None,
or
How to change the appbar item`s icon?
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With FormBorderStyle=None you don't have any header on your form, so neither an application name visible, nor an icon.
Can you clearly specify what problem is?
> when set c#(windows2000) form`s FormBorderStyle=None,and run the
> application,it show in appbar only with application name ,why no
> applicaiotn icon?
Jannigje 
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FormBorderStyle=None
run it
at appbar(taskbar) ,the application button one with Text of applecation name.why has not application icon?
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The taskbar displays both the title and the icon set to the form.
Still don't see any problem.
Two icons:
1. You can set an icon to the form itself.
2. You can set an icon to the app in the project settings
(common properties, general).
I tested with a simple app, running a form with FormBorderStyle = None,
in the taskbar the header and icon of the form were shown.
Jannigje
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Dear, Sir and Madam
I bind a TextBox to a Binding.
My problem is how to cancel the text I have edit and return to the previous (value in database) when I press Esc.
Sorry for bad English.
Thank You.
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I've bought a Microsft book on using ASP.NET with C#.NET. I've just started coding using ASP>NET. At the top of each page is a menu. I need to include the menu file. In the old ASP I used a include file. Is this still valid in ASP.NET? The reason why I ask is because they didn't mention once about include files. Is this still the same when using ASP.NET?
I usually include a file like this in ASP:
How would I do this in ASP.NET using C#?
Thanks
Brendan Vogt
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Take a look at UserControls. I'm pretty sure your book also covers this issue.
By the way, the ASP.NET would be more appropriate for futher questions regarding this or similar topics.
www.troschuetz.de
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Look at www.sahometraders.co.za. When I mean menu I'm refering to Buying, Renting, Timeshare, Developments, Farms. Would you still use a usercontrol for this?
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Hmm, I think it's a bit difficult in this case.
The menu appears on all pages and the look stays more or less the same. But on the other hand the lower row of your menu contains different links on each page.
So when using a UserControl it would be easy to apply changes to the look of your menu but it would have to be costumizable during runtime (apply different links for each page).
Implementing the menu on each page would be the easier way until you decide to change the look.
So mainly this is a design question and up to you. How did you solve this when using the include file?
www.troschuetz.de
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Yes, UserControls are still best for this. You have complete control over what they contain at runtime and with proper caching will get performance similar to #includes.
In fact, if you want conditional includes, you can't use the old ASP method. #includes are processed before the script is interpretted. You would have to create conditionals that assume each #include is already included (like including the raw HTML or something).
UserControls give you must more control and are the recommended replacement of #includes in ASP.NET.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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I'm looking for some nice tool to make uml modeling and then convert it into C# project with roundtrip ability. I've tried ArgoUML which looks pretty good, but I've no idea how to genetrate XMI file from my project to import it. C# Generation works well, but I'm not sure if this may be roundtripped.
Regards
h.
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If you want nice - i.e. integration with the VS.NET IDE, roundtrip updates, and much more - and have the money to spend, try Rational Rose XDE for Visual Studio[^]. It's a bit pricy and requires a pretty decent machine to run it, but with my evaluation it was very nice.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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Yes, it's great solution. Pricy and heavy, but it's a standard.
But I meant something lightweight, handy and easy to use
but thanx for your answer
h.
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Hello,
I have created a solution that has the main project and a installer project. The installer works great but it is missing a couple things.
1. (most importantly) I would like to automatically start the application after it is installed. I need a dialog box for this and there would be one checkbox. If the user select the checkbox, application should start otherwise not.
2. I would like to launch a webpage in the browser after install.
Any Help would be appreciated!
Thanks!
Ravi
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raviran wrote:
The installer works great but it is missing a couple things.
What have you been smoking?
As someone that's worked with Windows Installer (including beta-testing and consulting) since MSI 1.0, I can tell you that VS.NET's installer project is missing a whole hellofa lot. It gives you the basics, but it's definitely not meant for commercial deployment. For that there's Wise for Windows Installer[^] (my preferrence based on experience, price, performance, and robustness) or InstallShield Developer[^]. There's also the WiX[^] toolset (generating MSIs and MSPs from XML files), one of Microsoft's open-source projects. It's also got a magnificent Custom Action library that would accomplish the very things you want. You could actually just use the Custom Action library and integrate with whatever MSI you want to produce.
With VS.NET's installer project just add a file to your project (like the WiX custom action DLL) then switch to the Custom Action view. Right-click either the root node (to add to all install actions) or to whichever install action(s) you want and select "Add new custom action" (or whatever it says). Browse to the DLL you added and add it. Then switch to the PropertyGrid, specify the EntryPoint, and provide any custom action data (in whatever format you want) required (like a URL to launch).
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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good day!! is there a way to retrieve values / changes from documentproperties? the screen is shown when you press 'properties' under the 'Print' window. these can be derived from winspool.drv. I was able to show the screen but my only problem is, as I have mentioned before,how to get the changes made by the user. sample values are the number of pages, and orientation, etc.. many thanks!!!
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hi there
my application crashes when i use Application.EnableVisualStyles()
the app runs fine but as soon as i exit a dialog form the app crashes.
what might be the problem?
VisionTec
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is that in 2005
ByMindOnlyYouCanDoIt
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