Updating forms

geek74 · 06-04-2009, 08:54 AM

I have two forms one of them I use it to show the contents of a data base in a DataGridView , the other one do I use it to add , to edit and to eliminate the data that I show in the first form , my question is , who I do than when you close second form update the data of the first form

theoobe · 06-04-2009, 09:35 AM

Geek74, I'm confused as to how your question relates to this thread.

Anyway, you've not given much details of your project, therefore I will assume that your main form class is called Form1, and that your form which you want to close is called Form2.

First thing to do is create the event FormClosing in your Form2:

Code:

protected override void OnFormClosing(FormClosingEventArgs e)
{
    base.OnFormClosing(e);
}

Next have a method in Form1 which, when called, will perform the updates you require:

Code:

public void UpdateData()
{
    // do update stuff here
}

Lastly, go back to your FormClosing event in Form2, and call the UpdateData method from there:

Code:

protected override void OnFormClosing(FormClosingEventArgs e)
{
    ((Form1)this.Parent).UpdateData();
    base.OnFormClosing(e);
}

**laserlight** · 06-04-2009, 09:38 AM

Posts moved to a new thread.

Magos · 06-04-2009, 10:54 AM

If the subform is a dialog (modal form) then you could do this:
Form1 - Main form
Form2 - Sub form (dialog)

Code:

//This code is called when you want to open the sub form

//Create the sub form
var Dialog = new Form2();

//Show the sub form
if(Dialog.ShowDialog() == DialogResult.Ok)
{
  //If the user pressed Ok, update the data
  //(don't update if he pressed Cancel or closed it)
  UpdateData();
}

You generally should avoid dependencies, like touching Form1 from Form2.

theoobe · 06-05-2009, 01:53 PM

Quote:

You generally should avoid dependencies, like touching Form1 from Form2.

OK, while taking Magos' point into consideration, it's still possible to have an event based solution:

Code:

using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private Form2 f2;

        public Form1()
        {
            InitializeComponent();
            this.f2 = new Form2();
            this.f2.FormClosing += new FormClosingEventHandler(this.Form2Closing);
            this.f2.Show();
        }

        private void Form2Closing(object sender, FormClosingEventArgs e)
        {
            // do update stuff here
        }
    }

}

DrGuitar · 10-15-2009, 03:17 PM

Is there a way to add the OnformClosing event through th UI instead of writing the code

valaris · 10-16-2009, 06:43 PM

Open the form in editor. Look at your properties window, click on the lighting bolt (events), find your event, type an event name, select a pre-existing one, or double click to have it generate one for you.

Again I would handle updates how magos suggested. Handle input verification on the form.

06-04-2009, 08:54 AM	#1
geek74 Registered User Join Date: Jun 2009 Posts: 1	Updating forms I have two forms one of them I use it to show the contents of a data base in a DataGridView , the other one do I use it to add , to edit and to eliminate the data that I show in the first form , my question is , who I do than when you close second form update the data of the first form
geek74 is offline

06-04-2009, 09:35 AM	#2
theoobe Registered User Join Date: Mar 2009 Location: england Posts: 76	Geek74, I'm confused as to how your question relates to this thread. Anyway, you've not given much details of your project, therefore I will assume that your main form class is called Form1, and that your form which you want to close is called Form2. First thing to do is create the event FormClosing in your Form2: Code: protected override void OnFormClosing(FormClosingEventArgs e) { base.OnFormClosing(e); } Next have a method in Form1 which, when called, will perform the updates you require: Code: public void UpdateData() { // do update stuff here } Lastly, go back to your FormClosing event in Form2, and call the UpdateData method from there: Code: protected override void OnFormClosing(FormClosingEventArgs e) { ((Form1)this.Parent).UpdateData(); base.OnFormClosing(e); }
theoobe is offline

06-04-2009, 09:38 AM	#3
laserlight C++ Witch Join Date: Oct 2003 Location: Singapore Posts: 10,362	Posts moved to a new thread. __________________ C + C++ Compiler: MinGW port of GCC Build + Version Control System: SCons + Bazaar Look up a C/C++ Reference and learn How To Ask Questions The Smart Way
laserlight is online now

06-04-2009, 10:54 AM	#4
Magos Confused Join Date: Sep 2001 Location: Sweden Posts: 3,122	If the subform is a dialog (modal form) then you could do this: Form1 - Main form Form2 - Sub form (dialog) Code: //This code is called when you want to open the sub form //Create the sub form var Dialog = new Form2(); //Show the sub form if(Dialog.ShowDialog() == DialogResult.Ok) { //If the user pressed Ok, update the data //(don't update if he pressed Cancel or closed it) UpdateData(); } You generally should avoid dependencies, like touching Form1 from Form2. __________________ MagosX.com Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime.
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10-15-2009, 03:17 PM	#6
DrGuitar Registered User Join Date: Oct 2009 Posts: 1	Is there a way to add the OnformClosing event through th UI instead of writing the code
DrGuitar is offline

10-16-2009, 06:43 PM	#7
valaris Registered User Join Date: Jun 2008 Location: RING 0 Posts: 462	Open the form in editor. Look at your properties window, click on the lighting bolt (events), find your event, type an event name, select a pre-existing one, or double click to have it generate one for you. Again I would handle updates how magos suggested. Handle input verification on the form.
valaris is offline

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