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I need to populate a listbox named "subcategory" once the user clicks his desired selection in dropdownlist named "category" e.g. c++ has subcategories polymorphism,inheritance etc.
please help me thru code
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manugrg wrote: help to new Programmer
This is a useless subject line.
Everyone asking questions on this forum is looking for help
The fact you are a new programmer has no relevance to your problem.
A better subject line would be "Problem filling listbox on dropdownlist selection"
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Is there some way to use a maskedtextbox for percentages, so that validation would become easier.
There is mask for date, time, and etc., but no mask for percentages. Or does it have to be customized.
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I have made a usercontrol that is basically a container with a nice looking header and an area for content. How do I add the usercontrol to another window and allow me to add other elements to the content area of the control? More specifically, I would like to be able to add the control to a window in blend double click it (change the insertion point) and add other controls as children of the usercontrol and they appear in the correct area. What do I need to do?
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I have a DataTable with my data stored in it, as follow:
ID , Surname , Name
----------------------
null , Parker , Peter
null , Kent , Clark
in C# I create my SqlDataAdpater and SqlCommandBuilder and use adapter.Update(table) to populate the database with my two rows. So on the database side my two rows have their unique Id's now.
What I want to know is how can I update my table with those two Id's? I don't want to retrieve all the data in the database, just the 2 ID's or rows with their new ID's.
One solution I thought off(really a bad idea), is using adapter.Update(rows[] and after a update call "SELECT @@IDENTITY" for each row. I don't like it and don't want to do it but I don't have another way to retrieve the ID's, or do I?
Any help would be appreciated.
Regards,
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Hi all,
Currently I am making one win32 application using VC++.NET 2003. I am using screen color matching for some purpose in the application. But when I changes color depth of screen from 32 bits to 16 bits it is not working because color values of R, G and B are changes. Is that possible to map 32 bit colors to 16bit or vice versa so I can compare them?
Thanks in advance,
Priyank
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Hi,
I am using Asp.net and vb as code behind. I want to connect to Sybase database. I am using sybase sql anywhere . I hve draged and droped odbcconnection and odbc adapter and dataset but nothing is displaying.
if i give odbcadapter1.Fill(dataset11) its showing error
ERROR [IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified
Pls tell me how can i specify the connection sting and how to connect to sybase database
Can anybody help me plsssssss.
Thanks in Advance
Thanks and regards
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micydon wrote: I am using Asp.net and vb as code behind
Perhaps the ASP.NET forum would be helpful?
led mike
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Can any body tell me how i can convert a DOC file (word document) into a BMP image. Is there any Active-X control for this purpose.
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You do know that this is the .NET forum don't you?
Deja View - the feeling that you've seen this post before.
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With VisualStudio.Net, i'm using an installer class with a custom action
on my setup project to ask the user a serial number. A "Textboxes"
dialog on the "user interface" provides the serial number string to an
overrided version of then install procedure, inside my installer class.
My problem is that the install sub is able to verify the serial number
entered, but then i can't stop/cancel the installation procedure.
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Hi there,
I'm new to .net programming and I've been using C++/CLI to develop a new application. I now have the following problem:
I have a Timer which has an ElapsedEventHandler defined.
Acoustics::Acoustics()
{
timer = gcnew System::Timers::Timer();
timer->Elapsed += gcnew ElapsedEventHandler(this, &Acoustics::timerUpdate);
}
void Acoustics::timerUpdate(Object^ sender, ElapsedEventArgs^ e)
{
ch->LastRxSignalElapsedTime += TimeSpan::FromSeconds(0.1);
ch->LastTxSignalElapsedTime += TimeSpan::FromSeconds(0.1);
}
"ch->LastRxSignalElapsedTime" and "ch->LastTxSignalElapsedTime" are properties in this class.
In the GUI, I define some bindings to these properties:
Label ^labelchrxtimer = (gcnew Label());
labelchrxtimer->DataBindings->Add(gcnew Binding("Text", kvp.Value, "LastRxSignalElapsedTime"));
Label ^labelchtxtimer = (gcnew Label());
labelchtxtimer->DataBindings->Add(gcnew Binding("Text", kvp.Value, "LastTxSignalElapsedTime"));
Now, when ElapsedEventHandler is executed, it is in a different thread, so the labels are not automatically updated by the bindings because the properties were changed by a different thread than the one that created the labels.
How can I have the labels correctly updated?
Thanks,
Spulit
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Hey Guys,
I have a vb.net app that I would like to have upload a text file to an ftp server. Is there a .NET class for doing this? I can't find much on "the google".
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There's an FTP Client implementation in the System.Net namespace in the .NET Framework 2.0, called FtpWebRequest[^].
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hi all,
I have a form that contains one button and one textbox, the textbox will take a number that will be passed to another form. I have done this successfully.
The thing is that I need the second form to create a number of pictureboxes = the number received from the first form.
Any ideas?
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sarah_malik wrote: Any ideas?
You have not really asked any question!
Creating Picture box is well documented in the MSDN
PictureBox picBox = new PictureBox();
picBox.Location = new Point(0, 0);
picBox.Size = new Size(10, 10);
picBox.TabStop = false;
picBox.SizeMode = PictureBoxSizeMode.StretchImage;
picBox.BorderStyle = BorderStyle.Fixed3D;
this.Controls.Add(picBox);
and you can loop to the number required and create any many as you wish.
If your question is on positioning of the picture boxes, then if you are using .NET 2 then consider using any of the Layout Panels objects like TableLayoutPanel.
Best regards,
Paul.
Jesus Christ is LOVE! Please tell somebody.
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I had written my program, but it work so slow, that all work looks like one big photo album. I tried optimizate with visual studio, but it gave nothig.
What could I do to increse program working speed?
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Well without knowing anything about your program it is hard to say. But here are some things to look at.
What graphics methods are you using? I don't know alot about all of them but I know that setpixel and getpixel are really slow.
Do you have unnecisary calculations inside of a loop? In other words if you have a value that will remain the same for the duration of a loop, calculate its value outside the loop so your program doesn't have to repeat the operation thousands or millions of times.
Are you rediming large arrays constantly? In particular redim preserve is slow because the computer is actually making a new array and copying the contents over from the old one.
I hope this helps,
Mike
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I use two picturebox's arrays, wich have 10 elenemts, two timers. My form is maximized and transparent. Then the form wasn't trasnparent, program was going on the right speed.
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There are any number of reasons as to why your program could run slowly. We don't have enough information to give you an informed opinion. I would guess, though, that you may have memory issues. Take a look in Task Manager and see how much memory your application is using. If it looks as though it's chugging memory like Duff beer, take a look at this article:
http://www.marcclifton.com/tabid/79/Default.aspx[^]
Deja View - the feeling that you've seen this post before.
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Best thing to do would be to post the sub/function that you think is acting slowly (not the whole program) with a little explaination of what you are trying to do with it. Even if I don't have the answer someone else may. Otherwise we can only guess what the problem is.
If you are not sure which sub/function is the problem then try setting some breakpoints and run through your program and see where it is getting hung up.
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private: System::Void tmr_for_move_Tick(System::Object^ sender, System::EventArgs^ e) {
Move_usr();
if(b_usr.pct->Visible == true) Move_bl_usr();
for(int i=0; i<n; i++){
Move_em(i);
if(b_em[i]->pct->Visible == true) Move_bl_em(i);
if(b_usr.pct->Visible == true) Check_hit_em(i);
if(b_em[i]->pct->Visible == true) Check_hit_usr(i);
else if(em[i]->pct->Visible == true) Shooting_em(i);
}
}
private: void Move_em(int i){
if(em[i]->pct->Left + em[i]->step_x > min_x && em[i]->pct->Left + em[i]->step_x < max_x)
em[i]->pct->Left += em[i]->step_x;
else em[i]->step_x *= -1;
if(em[i]->pct->Top + em[i]->step_y > min_y && em[i]->pct->Top + em[i]->step_y <= max_y)
em[i]->pct->Top += em[i]->step_y;
else em[i]->step_y *= -1;
if(em[i]->pct->Left == max_x) em[i]->step_x = - em[i]->step_x;
if(em[i]->pct->Top == max_y - 58) em[i]->step_y = - em[i]->step_y;
if(em[i]->step_x > 0) em[i]->pct->Load("e_r.jpg");
else if(em[i]->step_x < 0) em[i]->pct->Load("e_l.jpg");
if(em[i]->step_y > 0) em[i]->pct->Load("e_d.jpg");
else if(em[i]->step_y < 0) em[i]->pct->Load("e_u.jpg");
}
Other procedures are same, but move different object.
private: object usr, b_usr;
private: static unsigned short int hits = 0;
private: static unsigned short int n = 10;
private: static unsigned short int m = 32;
private: static array<object^>^ em;
private: static array<object^>^ b_em;
ref struct object {
int step_x, step_y;
System::Windows::Forms::PictureBox^ pct;
};
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Hi,
So the form's transparancy is the key factor. Does it have to be transparant ?
And are you using double-buffering ? If not, I would recommend you try it.
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what do you mean saying "double-buffering" ?
-- modified at 10:39 Tuesday 13th March, 2007
I find out what is double-buffering, and added. It really helped. Tank you all for your help.
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