Re: combobox - C# Discussion Boards

Re: how to create a C# windows service which has a GUI.

oykica6-Jun-05 6:31

6-Jun-05 6:31

Windows Services do not have a user interface and are often run without a user logged on. To create a Windows Service derive from the System.ServiceProcess.ServiceBase class. To write a controller for your Windows Service create a WinForms application and use the System.ServiceProcess.ServiceController class. A little searching on those classes and you should be able to find plenty of samples.

combobox

webhay6-Jun-05 2:16

webhay

6-Jun-05 2:16

Hello All,

How can i dispaly the first recorde in the combobox blank when it is binded with the datasource

Regards
Hay

Re: combobox

MoustafaS6-Jun-05 2:36

MoustafaS

6-Jun-05 2:36

Change the dropdownstyle property to dropdownlist.

Re: combobox

webhay6-Jun-05 2:44

webhay

6-Jun-05 2:44

Yes i changed it but no impact it still dispaly the first record.

Thanks

Re: combobox

MoustafaS6-Jun-05 3:29

MoustafaS

6-Jun-05 3:29

.Text="";

Re: combobox

albCode6-Jun-05 4:33

albCode

6-Jun-05 4:33

ComboBox1.Items.Add("Washtington DC");
ComboBox1.Items.Add("second values");
ComboBox1.Items.Add("third value");

the ComboBox1.Items.Add("Washtington DC"); will be the first value in combobox when u run ur project.

But u have to fill ComboBOx in Form1_Load Event otherwise it will not works

Re: combobox

webhay6-Jun-05 4:36

webhay

6-Jun-05 4:36

Thanks for your reply

but the add method dosnt work when the combobox binded with datasource.

Hay

Re: combobox

albCode6-Jun-05 4:41

albCode

6-Jun-05 4:41

U have to fill it from DataBase or u trying to fill it manyally by filling urself.
if u not using dataBase the method Add have no way to do not work.
Or I suggeset you to open new C# Windows Application then drop one ComboBox and begin filling using Add method.

I hope this heslps you...

Re: combobox

webhay6-Jun-05 4:44

webhay

6-Jun-05 4:44

Thanks so much about your help.

The problem that i fill the combobox from the database and the add method dosnt work when the datasource work.

Thanks
Hay

Re: combobox

albCode6-Jun-05 6:38

albCode

6-Jun-05 6:38

i hope this helps u now

comboBoxState.DataBindings.Add("SelectedValue", customersDataSet1, "Customers.Region");

Data Overflow error

UdayShetty6-Jun-05 2:05

UdayShetty

6-Jun-05 2:05

hi,
When i am filling a dataset from oracle table, I am getting an error 'Overflow OCI-22053'. This caused by the numeric field. There is the solution available in microsoft site also. But I just can't understand.

Please help me.

VS 2003

Uday Shetty

Re: Data Overflow error

rocky_pulley6-Jun-05 2:24

rocky_pulley

6-Jun-05 2:24

It sounds like the number you are passing in is just too big. If the numeric field only supports a max value of say 65535 and you pass it in a long value that's say 1234567, then it will throw an overflow exception. I guess a way to fix it would be either to change the size of the numeric field in the database, or if that's not possible you can return an error to the user or just set it to the max size and ignore the rest of the number.

-- Rocky Dean Pulley

Run time specification of arguments to method

cmpipey6-Jun-05 2:01

cmpipey

6-Jun-05 2:01

Is there an elegant approach to specifying an argument list for a method at run time? I'm working on an app that makes a set of analysis of a data set. Which analysis and to make and in which order order is specified at run time. I'd like the class to be able to inform a class that calls it what arguments are needed.

Using a params object [] array in the argument will of course give me complete freedom for consuming what ever is submitted, but doesn't provide a mechanism for telling the program what to put into the array.

class MyData{}

class DataStudy{

MyData InputData;

}

class DataAnalysis{

static float Average(MyData InputData){}

static float WeightedAverage(MyData InputData, float weightfactor){}

static float WeightedMomentAverage(MyData InputData, float weightfactor, float momentfactor){}

}

Thanks.
cmayo

Re: Run time specification of arguments to method

Robert Rohde6-Jun-05 3:34

Robert Rohde

6-Jun-05 3:34

Have a look at the System.Reflection namespace.
If you have a Type object (can be got via object.GetType()) try the GetMethods and GetProperties functions. They will give you objects describing the methods with all their arguments.

pInvoke problem

ppp0016-Jun-05 1:15

ppp001

6-Jun-05 1:15

Hi,

I am trying to pInvoke a vc++ dll from c#, the c# code
try to pass an integer into the dll and change
the global variable declared in the c++ dll, but it failed.
The global variable (int) changed inside the c++ procedure called by
the c#, but once the program run outside the procedure, the global
variable restore to its original value, why ?
And how can I change the global variable declared in the c++ dll when pinvoke by c# ?

Thanks

Re: pInvoke problem

Carsten Zeumer6-Jun-05 1:49

Carsten Zeumer

6-Jun-05 1:49

To me it does not sound like a pInvoke problem but a generic dll problem.
How did you declare you local variable in c++? is it a static int?
Did you check if your c++ dll is unloaded after the pInvoke? (try to add trace code to the _main)

/cadi

24 hours is not enough

save a windows form object inside a SCII text file

Anonymous6-Jun-05 1:12

Anonymous

6-Jun-05 1:12

i would save and object as a treeview inside a ASCII textfie so can i read it again and assign to a new treeview:

tfile = myOldTreeVew.toTextFile();
.... close the applicaion

.... open again the application
myNewTreeView.ReadFromTextFile(tfile);

Obvialy these functions don't exist, but i need something like them.

Re: save a windows form object inside a SCII text file

Robert Rohde6-Jun-05 3:37

Robert Rohde

6-Jun-05 3:37

Have a look at this article. I think it provides everything you need.

Saving windows form's screen

angeltsoi6-Jun-05 0:28

angeltsoi

6-Jun-05 0:28

I would like to save the screen of windows form as an image, would you please advice on how can I do so?

Print Screen may not work as I may need the screen of form that is not currently using. Besides, I do not have button on the form that I want to print, i.e. I invoke the print screen function from another form.

Thanks very much.

Re: Saving windows form's screen

Corinna John6-Jun-05 1:12

Corinna John

6-Jun-05 1:12

You could get the DC of the form and do a bit block transfer:

<br />
//get window handle<br />
IntPtr hwndDesktop = GetDesktopWindow(); //function from user32.dll<br />
<br />
//get size of the form to copy<br />
Size s = form.DesktopBounds.Size;<br />
<br />
//get the form's graphics<br />
Graphics graphicsForm = Graphics.FromHwnd(hwndDesktop);<br />
<br />
//creaste bitmap from form's graphics<br />
Bitmap bitmap = new Bitmap(s.Width, s.Height, graphicsForm);<br />
<br />
//get graphics of the new image<br />
Graphics graphicsBitmap = Graphics.FromImage(bitmap);<br />
<br />
//get hDC of form and bitmap<br />
IntPtr dcForm = graphicsForm.GetHdc();<br />
IntPtr dcBitmap = graphicsBitmap.GetHdc();<br />
<br />
bool result = BitBlt( //function from gdi32.dll<br />
dcBitmap,<br />
0, 0,<br />
form.DesktopBounds.Width, form.DesktopBounds.Height,<br />
dcForm,<br />
form.DesktopBounds.Left, form.DesktopBounds.Top,<br />
SRCCOPY);<br />
<br />
//dispose all object ...<br />

_________________________________
Please inform me about my English mistakes, I still try to learn your language!

How to Replicate 2 Databases using C#?

pubududilena5-Jun-05 23:04

pubududilena

5-Jun-05 23:04

hi all,
I need to replicate Two Databases using C#?
One Database is in "pubudu\MSDE" SQL Server ..Other Database is in "kushan\MSDE" Server.
Can any body please tell me How to replicate above two databases?

any anwers would be greately appreciated.

regards,
pubudu.

Re: How to Replicate 2 Databases using C#?

oykica6-Jun-05 6:38

oykica

6-Jun-05 6:38

Are you talking about SQL Server Replication or some sort of manual process?

Re: How to Replicate 2 Databases using C#?

pubududilena6-Jun-05 17:37

pubududilena

6-Jun-05 17:37

hi,

I know that SQL Server 2000 has some functions for Data Replication.But I need to know there are other free softwares for Data Replication?
Or can we do it as manual way?

regards,
pubudu.

Re: How to Replicate 2 Databases using C#?

oykica7-Jun-05 6:27

oykica

7-Jun-05 6:27

I am not familiar with any free software that does this but you might be able to find something. Are you looking to have the data replicated immediately as it is changed?

MDI Behaviour

Maqsood Ahmed5-Jun-05 22:03

Maqsood Ahmed

5-Jun-05 22:03

Hello,
Usually when I drop some controls at the MDI Parent and later open Mdi Child forms, I can see MDI Parent controls on the top of child forms. Is there any way that we can display Child forms without displaying MDI Parent controls. I know that SetWindowPos can make a child form topmost. but It'll be on the top of all other forms too which is not a good solution to the problem.
Any suggestions in this regard will be appreciated.

TIA

Maqsood Ahmed [MCP,C#]
Kolachi Advanced Technologies
http://www.kolachi.net

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