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I have a VB.Net 2.0 custom control which allows me to pick a date and a 24 hour time. The control consists of a standard DateTimePicker to select the date and for the 24 hour time a textbox (txtHours) to display the selected hour, a label (lblSelectHours) which consists of an image of the standard dropdown icon and a Panel object. When the user clicks on the dropdown label the Panel, containing one button for each of the 24 hours in a day, should pop up. However, the panel is nowhere to be seen even though I know the label's Click event is firing. I am pretty puzzled about this as the popup panel for the standard DateTimePicker in the control appears perfectly. The Panel object is defined in the control as being off the main area being displayed but when the user clicks the dropdown arrow (the label) the event handler below should set the correct position to appear and set Visible to true:
Private Sub lblSelectHours_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lblSelectHours.Click<br />
<br />
pnlHours.Left = Me.Left + txtHours.Left<br />
pnlHours.Top = Me.Top + txtHours.Top + txtHours.Height<br />
pnlHours.Visible = True<br />
pnlHours.BringToFront()<br />
<br />
End Sub
So does anyone know why my popup panel won't appear? If I copy the various components of the control and just put them on a form (ie: without the use of a custom control) the panel appears fine with this same code.
TIA for any help...
Mike
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I am surprised to see Left+Left and Top+Top
maybe your coordinates are way off ?
Luc Pattyn
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I have an issue. I have a datagrid that includes a dropdownlist when I populate it. What I want to happen is, when I load the datagrid, I also preset the dropdownlist to the value (if any) that's in the row from my SQL Server.
Right now, the values in my dropdownlist are 1, 2, and 3 for Not Arrived, In Warehouse, and On Location respectively. In the table, a row may have any one of these three values. Everything else is populated just fine. I'm just at a loss as to how I can programatically preset the value of the dropdownlist to the column value.
Any help would be greatly appreciated. The only other thing I can do is to have the value loaded when they choose to edit the datagrid row. That would work, but it would be nice to have it preset.
Thanks very much! BTW, I'm using VS 2003.
Pat
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Hi,
Take the Value that is to be selected in the dropdownlist in a table that is binded to grid. And in grid you make that column visible=false.
We have an event ItemDataBound. in this event you write a code to cast the template Drop downlist to a dropdownlist and using the cell value you bind the selected one.
public void DataGrid1_OnItemDataBound(e EventArgs,Object Sender)
{
if(e.Item.ItemType==ListItemType.Item)
{
DropnDownList ddlGridDropDown=(DropDownList)e.Item.FindControl("ContolName");
ddlGridDropDown.SelectedValue=Convert.ToInt32(e.Item.Cells["CellName"].Value);
}
}
Hope this will work for you.
Thanks & Regards.
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Well this all looks very impressive.
the last thing I want to see is some pasty-faced geek with skin so pale that it's almost translucent trying to bump parts with a partner - John Simmons / outlaw programmer
Deja View - the feeling that you've seen this post before.
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And the question is ?
Luc Pattyn
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I see that you got a 1 vote for this. May I suggest that you create an article (or two) about it. This is much more likely to drum up interest.
the last thing I want to see is some pasty-faced geek with skin so pale that it's almost translucent trying to bump parts with a partner - John Simmons / outlaw programmer
Deja View - the feeling that you've seen this post before.
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Beating my head with this one...
How can I add a command line argument to a service written in .Net or, for that manner, can it be done?
Thanks,
Tim
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When you create a WindowsService project the wizard generates an OnStart handler for you.
protected override void OnStart(string[] args)
Doesn't get much easier than that.
led mike
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That's good.. but I am trying to find out how to modify the service startup to pass a command line argument, not the code in the service itself.
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Well you select the service in the "Services" MMC Snap-in and right click, select the "Properties" menu item. In the properties dialog there is a "Start Parameters" Text Box.
led mike
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I was typing a reply to that effect when I received your reply; the only problem with that is that the parameter is not persistent. If the service is stopped/started, the parameter is removed.
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Well you asked for the wrong thing then didn't you? What you want is a configuration solution for a Windows Service. Try looking at this article[^]
led mike
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I am creating my first control.
I am exposing a collection which I can edit perfectly via the property grid (We'll call this names).
Into this collection I can add Forename, Surname, Address etc.
I wish however to have another property exposed where, when the names collection has at least one member, I am able to select a default address from a drop-down populated with the contents of the 'names' collection.
I have seen examples of using GetStandardValues to return a static list of values from inside the type converter, but I cannot figure out how to reference my 'parent' object in order to iterate through the names collection and return values from that.
Many thanks in advance.
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Hi All,
I have written a Windows application in C# running on Windows XP/2000 for .NET version 1.1 . When i execute the code, and load one of the modules for the first time, it takes around 3 sec.
After unloading, when the same module is reloaded with all the same parameters, it takes only about 1 sec. All the conditions to reload the module are the same, all the SP's called are the same, which i cross verified by the ANTS performance profiler!!! But still there is considerable time difference!!!
I thought that this difference was because of the JIT compilation which CLR does for the first time and for the successive times, JIT doesnt come into the picture, hence the time difference.
But I tried generating the Native images (pre-compile the code) of the complete code using "ngen", and after observation, concluded that the behavior still pertained.
I am now unable to locate the problem as in why the time difference exists?
1. Is it that im using "ngen" wrongly?
2. Is there some other reason for the strange behavior?
I would be extremely thankful on receiving valuable inputs from the forum,
Rajesh
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RajeshGuptha wrote: 2. Is there some other reason for the strange behavior?
The hardware and OS caching of the files that are loaded into memory? You should see the same sort of difference with a native EXE.
led mike
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Hi Led Mike,
Sorry i could not understand the comparison you are trying to mention here...If you dont mind could you please elaborate on that??
Regads,
Rajesh
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Hi Led Mike,
Thanks for the guidance,
Ill read the article, and get back if needed.
Cheers,
Rajesh
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For one thing, there is the file system's cache; whatever file is read, it ends up in this
cache (its size could be something like 25% of your total memory, which can well be bigger
than your application's exe file) so later executions of that exe (or its dlls) may be
faster.
Second, there are the security checks (of which I dont know any details); they may
execute a lot faster second time around, probably also due to some caching.
Third, Visual seems to require a few seconds when your application throws its very first
exception (I dont know why this is), so be careful about any debugging/observation tool
that is active during your tests.
Further concerns:
- is your exe very big ?
- are there many many other files required (dlls, ....) ?
- do they all reside on local disks ?
- is any networking involved (which typically contains rather big timeouts) ?
Finally, I would not suspect the JIT, I never had to really wait for it.
Hope this helps.
Luc Pattyn
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Hi Luc Pattyn,
Thanks for your valuable inputs..
While testing, none of the debugging tools were active.. i had ran the .exe of my application.
My exe is not that big, though it requires around 20 dlls (20 projects in Visual Studio), one among them is really huge around 20MB, as it contains hundreds of images required by the application, and 4 COM components registered locally... Do you think this is a large number? And yes all these DLLs reside on local disks. If this is a large number, then should i think of redistributing code and reduce the number of DLLs??
I connect to DB on network, do you think this might create problems only for the first time?
And for the remaining probabilities you said, is there a work around for those problems?? Have you come across situations like these???
I would be very thankful in getting further inputs from you,
Regards,
Rajesh
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Hi Rajesh,
well I never did a 20 DLL project, so I cant tell you that is the culprit. And I sure
would hope it is not, since DLLs are needed for component based development...
But I suspect one of these two:
- connecting to the DB could be the culprit; you might modify some code
and try a run without DB (i.e. fake some data locally and watch the start-up speed).
- Assuming you are starting your app (including loading images, and connecting to the DB)
all sequentially, you could try to do (large parts of) the initialization asynchronously
and in parallel, using a few separate threads.
If this does not help, I would start looking to the DLLs.
A possible experiment there is replace the big images DLL by something much smaller.
For all of the above:
- either keep the code as is, but include some logging
a couple of lines such as
Console.WriteLine(DateTime.Now.ToString("HH:mm:ss.fff")+" Starting/ending operation 3");
could reveal the bottleneck(s)
- or change the functionality of the code, but dont spend the time to modify everything
thoroughly (until you know for sure it needs the change), change just enough to be able
to judge start-up speed differences.
Regards,
Luc Pattyn
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Hi Luc Pattyn,
Thanks a lot for your guidance.
Ill try all the possibilities, and read the articles which you have suggested. Hope to get some positive results..
Will get back to you!
Thanks and Regards,
Rajesh
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FYI I just rediscovered an MSDN article that might interest you:
Improving Application Startup Time[^]
but be warned most of its suggestions fall in the category: "if you like some feature
because it is fancy, useful, powerful, you may not like its performance consequences."
Luc Pattyn
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