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how to avoid creating same form objects

Hello Experts,
I am busy with visual c# project on win mobile 2003 se.

I have a main form which sync with the server through web service and get the recent list of orders.

for this action I call another class syncDB and that class do the synchronization and writes the records locally.

The process is going fine.

When I want to go to the detail form to see the details I do the main form hide and show the detail form like bellow.

// MainForm.cs

EKS_comsy.detailFrom df=new detailForm(orderNr);
df.Show();
this.Hide();

then if i want to come back to the main form again i say in the datail form
//detailForm.cs

EKS_comsy.MainForm mf=new MainForm();
mf.Show();
this.Close();

Here i am creating a new object of the main form it initalize all the elements before it come there. How can i avoid this problem and call the form that i have already. The way i use the code now makes the preformence of the program very low.

Can anyone help me to solve this issue.

thanks in advance.

AlexFM

EKS_comsy.detailFrom df=new detailForm(orderNr);
df.FormClosed += new FormClosedEventHandler(df_FormClosed);
this.Hide();
df.Show();

void df_FormClosed(object sender, FormClosedEventArgs e)
{
this.Show();
}

For C# version before 8.0 use Closed event instead of FormClosed.

Ludo_Dirckx

ASKER

I have to use Closed then
should i use it like
df.Closed += new FormClosedEventHandler(df_FormClosed);

is it right

ASKER CERTIFIED SOLUTION

AlexFM

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Ludo_Dirckx

ASKER

The code you wrot is working fine.
Now in the detailForm should i remove the new main form command.

EKS_comsy.MainForm mf=new MainForm();
mf.Show();

i removed the command above in the detailForm.
When i click the back to main form button the program just quit itself.

What went wrong.

AlexFM

You need to remove all code related to main form from details form. If details form is closed by button, use only
this.Close();

Main form waits for Closed event and shows itself again.

Ludo_Dirckx

ASKER

I think i made it.
I had put it in the right place.
It was my mistake.
thanks a lot.

Ludo_Dirckx

ASKER

hi AlexFM,
I got one more question.
How can i refresh the mainform when i show it again

AlexFM

I don't know what is "Refresh" in your program, this is application-specific. In any case, you can add this code to df_Closed function, after this.Show line.

Ludo_Dirckx

ASKER

No it is ok.
I have a timere wihich refreh the form and every 2 minutes i refresh the mainForm to whow the new records.
It is ok.
It was not related to the df_Closed.

thanks.