C# Discussion Boards - CodeProject

Passing information from one form to another

kulile1-Oct-06 7:20

1-Oct-06 7:20

Good day

Im having a problem passing an object from one form to another. Im trying to achieve this by passing it through another form's constructor. It does not give me any errors but the form im passing the object to doesnt show anything. all my controls disappear, it's like a new created form.

Am i doing this the wrong way and which is the right way to do it.

Thank you in advance

Kulile --- RSA

Re: Passing information from one form to another

Michael P Butler1-Oct-06 8:45

Michael P Butler

1-Oct-06 8:45

kulile wrote:

Im having a problem passing an object from one form to another. Im trying to achieve this by passing it through another form's constructor. It does not give me any errors but the form im passing the object to doesnt show anything. all my controls disappear, it's like a new created form.

Am i doing this the wrong way and which is the right way to do it.

Without seeing your code, it is hard to spot what you are doing wrong. Have a read of
this article[^] which shows the best ways of passing information from one form to another.

Michael

CP Blog [^] Development Blog [^]

Re: Passing information from one form to another

kulile1-Oct-06 21:43

kulile

1-Oct-06 21:43

Thanks Michael. I found what the problem was. I was doing everything right except that in my new constructor, I didn't call the InitializeComponent(); method. that was the problem.

Thanks again

Kulile --- RSA

Handling ALT Key on Controls

Vertyg01-Oct-06 6:14

Vertyg0

1-Oct-06 6:14

Hello,
I want to create control(s) that would act like MS office 2007, so that when you press ALT key all controls that have hotkey will be repainted with hotkey drawn on itself.
I dont want to use KeyDown, KeyPress, KeyUp events.
Could it be all done trought some kind of extending of controls or so ?
overriding WndProc or so ?
Thanks.

Re: Handling ALT Key on Controls

Christian Graus1-Oct-06 9:55

Christian Graus

1-Oct-06 9:55

You could override the control classes, or you could use CreateGraphics to draw your keys direct to the screen, then call Invalidate in the key up, so the form gets repainted.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Re: Handling ALT Key on Controls

Vertyg01-Oct-06 10:12

Vertyg0

1-Oct-06 10:12

Chris,
Yes I want to paint them on control but how to handle pressing of ALT+KEY ?
I dont want to use KeyPress, KeyDown events?

Re: Handling ALT Key on Controls

Christian Graus1-Oct-06 10:19

Christian Graus

1-Oct-06 10:19

Vertyg0 wrote:
I dont want to use KeyPress, KeyDown events?

Why on earth not ?

You can use a WndProc to catch these events earlier, but you really have no option but to use them, you want to catch when a key is down, and when it's raised again.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Re: Handling ALT Key on Controls

Nader Elshehabi1-Oct-06 14:17

Nader Elshehabi

1-Oct-06 14:17

Hello

You can set a property called KeyPreview to truein your form itself. Then handle KeyDown event in the Form level. It will catch any KeyDown events in any control in that form before it is sent to that control.

Regards

Re: Handling ALT Key on Controls

Andrei Ungureanu1-Oct-06 21:20

Andrei Ungureanu

1-Oct-06 21:20

Try adding & in front of the letter that will be the hot key

Do your best to be the best

Location and access method for global connection strings

PeteConc1-Oct-06 5:26

PeteConc

1-Oct-06 5:26

Hello. I am developing some classes that access SQL and Oracle databases.
These classes are to be used by different applications, (windows and web applications).
Thus, I need to put the database connection strings on a global location so that all applications see them (this way if I need to do changes to a connection string all applications are affected).
I found that machine.config might be a proper location to do that, under the <connectionstrings> section.

- Is machine.config a good solution for global connection strings?
- If so, how can I access the <connectionstrings> section in my code?

Thanks.

Re: Location and access method for global connection strings

S. Senthil Kumar1-Oct-06 9:37

S. Senthil Kumar

1-Oct-06 9:37

Machine.config does seem like a good idea. You can use ConfigurationManager.OpenMachineConfig[^], which even has a ConnectionStrings[^] section to store and retrieve connection strings.

Regards
Senthil [MVP - Visual C#]
_____________________________
My Blog | My Articles | My Flickr | WinMacro

help with data access

Mridang Agarwalla1-Oct-06 1:20

Mridang Agarwalla

1-Oct-06 1:20

Dim loConn, lsSQL, loRs
Set loConn = CreateObject("ADODB.Connection")

' Open a connection to the database
loConn.Open("DSN=myDSN;UID=something;PWD=Something;")

' Insert a new record into the table
lsSQL = "SET NOCOUNT ON;" &_
"INSERT INTO tMembers (MemberName) VALUES ('Manohar');" &_
"SELECT @@IDENTITY AS NewID;"

' Execute the SQL statement
Set loRs = loConn.Execute(lsSQL)

' Get the inserted ID
llID = loRs.Fields("NewID").value

' Close the connection
loConn.Close()
Set loConn = Nothing

Hi guys,
What would be the equivalent code of the the above in C#? I have used ADO.NET a bit. How would i have to access the returend value (NewID). Would i have to pouplate a dataset or something? Is there a simple way to access single values returned by a database such as

SELECT DISTINCT store_name FROM Store_Information WHERE id = 5

Thanks!

Re: help with data access

Rob Graham1-Oct-06 4:39

Rob Graham

1-Oct-06 4:39

The SQL would stay essentially the same in ADO.net.
Use an OledbCommand (or SqlCommand if using SQL Server) and do MyReader = mYcommand.ExecuteReader();
A datareader is analogous to a forward-only ADO recordset. I your examles above, you are reutuning recorsets that just happen to have only one row, one column. A datareader would do the same.

Zip Folder [modified]

dehghan198430-Sep-06 23:59

dehghan1984

30-Sep-06 23:59

hello all,
I want Compress a folder that contain some files and subfolders.
how can i do it in visual C#.Net

-- modified at 6:36 Sunday 1st October, 2006

Re: Zip Folder

User 66581-Oct-06 0:30

User 6658

1-Oct-06 0:30

Use the SharpZipLib

regards

modified 12-Sep-18 21:01pm.

Re: Zip Folder

Hamid_RT2-Oct-06 9:33

Hamid_RT

2-Oct-06 9:33

See here[^] maybe its some helpful for you

WhiteSky

timers in services

sianatia30-Sep-06 23:03

sianatia

30-Sep-06 23:03

hi,
I want to use timer in my service ,but the timer never starts although i have put the start code of the timer in the onstart() method of the service.

Re: timers in services

Stefan Troschuetz30-Sep-06 23:21

Stefan Troschuetz

30-Sep-06 23:21

I guess you're using the System.Windows.Forms.Timer. This one won't work as your service has no message pump. Try the System.Timers.Timer or System.Threading.Timer.

"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook

www.troschuetz.de

Controls's array

t_nedelchev30-Sep-06 22:07

t_nedelchev

30-Sep-06 22:07

Hello.
I want to make an array of several controls for example buttons in my windows application.
is that possible in VS 2005?

Thanks everyone.

Please, Send me an answers to t_nedelchev@abv.bg.

t_nedelchev@abv.bg

Re: Controls's array

Stefan Troschuetz30-Sep-06 22:17

Stefan Troschuetz

30-Sep-06 22:17

Sure you can. Simply declare the array and assign a new or existing Button reference to it.

Button[] buttonarray = new Button[5];
for (int i = 0; i < buttonarray.Length; i++)
  buttonarray[i] = new Button();

If you create the buttons dynamically don't forget to add them to the controls collection of your form or any container in it, so they get displayed.

Re: Controls's array

t_nedelchev30-Sep-06 23:06

t_nedelchev

30-Sep-06 23:06

Thanks for your fast reply, Stefan.

I wrote the code above.
this creates buttons, but they are invisible.

after your piece of code i wrote the following:
buttonarray.Location =...
buttonarray.size = ....
buttonarray.name = ...
buttonarray.tabindex = ...
buttonarray.text = ....
buttonarray.visible = ...

but again without success - there no buttons on my form.

what do i miss?

thanks.

Re: Controls's array

Stefan Troschuetz30-Sep-06 23:17

Stefan Troschuetz

30-Sep-06 23:17

As I said you have to add them to the controls collection of your form or any container in it. After all buttons are created, add the following line:

this.Controls.AddRange(buttonarray);

Re: Controls's array

t_nedelchev1-Oct-06 1:23

t_nedelchev

1-Oct-06 1:23

Dear Stefan Troschütz, Thanks a lot. I made it.

keys events

Kola Sokol30-Sep-06 22:05

Kola Sokol

30-Sep-06 22:05

hi i am try learn "push buttons events" & i stack on this.

i want on key ENETER push navigate on my pooor webBrowser Smile | :)

but this doesn work

1)
void Form1_KeyPress(object sender, KeyPressEventArgs e)
{
// Navigate if the ENTER key is pressed
if (e.KeyChar == '\r')
Navigate();
}

2)
private void Form1_KeyDown(object sender, KeyEventArgs e)
{

if(e.Alt && e.KeyCode == Keys.E)
}

please tell me where prolem?
i am using VC#2005
tnx for help

i am noob in c#

Re: keys events

Stefan Troschuetz30-Sep-06 22:29

Stefan Troschuetz

30-Sep-06 22:29

At first I'm not really sure whether the keychar resulting from pressing enter is "\r". It would be better to check for it inside the KeyDown event handler e.KeyCode == Keys.Enter. This way you will also have your keyboard event handling in one place.
Secondly, are you sure the events are really fired (You may debug it)? Most probably your entering text in some other control, so the keyboard events of your form are only fired, if you set KeyPreview true. Either do this, or much better IMO register the KeyDown event handler to the control that's getting edited.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.