Passing value from one form to another OPENED form

[JustRun]

Hi,

I have two form, MainForm has link do the following:
frmChild.showDi alog();

the frmChild process some data then should return value to MainForm at TxtBox control

How can i do this?

I need a quick reply plzzz
Thanks

[GaryTexmo]

Thlintoq has been involved in a few discussions on this very topic around here, have a look and see if they help you out :)

http://bytes.com/topic/c-sharp/answers/875371-how-do-i-carry-out-command-control-one-form-another

http://bytes.com/topic/c-sharp/answers/875356-accessing-components-one-form-another

Also, since the form is being shown as a dialog, you can always expose some public properties that your main form can read when you're finished. Just remember that you can't directly read the value of a control because, as the form has closed, those controls are now disposed. You'd have to copy the value of the textbox to a private member when the form closes (or in some other circumstance of your choosing).

Good luck!

[tlhintoq]

Good memory Gary. I'm impressed.

[guimel]

Also, since the form is being shown as a dialog, you can always expose some public properties that your main form can read when you're finished. Just remember that you can't directly read the value of a control because, as the form has closed, those controls are now disposed.

Is this true ? (that you can't access the controls once ShowDialog has returned). I often have the following:

void Configure(){
frmConfigure frmconf = new frmConfigure(Title, setting1, setting2);
if (frmconf.ShowDialog() == DialogResult.OK){
  setting1 = frmconf.Setting1;
  setting2 = frmconf.Setting2;
}

where

partial class frmConfigure{
public string Setting1 { get {return TextBox1.Text; } }
public string Setting2 { get {return TextBox2.Text; } }
}

My reading of the designer generated code for frmconf is that the components are only disposed when the form is disposed. Now, since I still have a reference to frmconf after ShowDialog returns, the form should not be disposed and the controls still exists.
Is this correct, or have I just been lucky that my program hasn't crashed so far ?

[GaryTexmo]

You're absolutely correct... I had a problem a while back with a modal dialog disposing on me when I didn't want to and my brain must have associated it with that, but I just did a quick test and that code is fine. The IsDisposed property is also false, doubly confirming that you're correct.

Looking at that code, I see where I got mixed up. If you're interested in the details, throw me a PM, but I don't think it belongs in this thread (I don't want to confuse things further!). About all I'll say is that a form called with ShowDialog() will return and the reference will stay active, but a form called with Show() will return and dispose.

Either way, you're correct, you don't need to worry about your form disposing and your code is just fine :)

[JustRun]

Sorry for the late reply, I really was so sick.
Thanks Guimel and Gary, you helped a lot :)