DaniWeb IT Discussion Community - Open Same forminstance Multiple times

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Jennifer84

Mar 24th, 2008 10:44 pm

Open Same forminstance Multiple times

I wonder how it is possible to open 2 instances at the same time of a Form.
Normally when you ex press a button to open another form, one instance of that form is opened.

If I put these 2 lines inside a buttoncontrol, first one instance is opened and when I close this opened form, then the next line executes and the same form opens again.

How could it be possible to open both at the same time, so I have 2 instances open ?

this->form2instance.ShowDialog();

this->form2instance.ShowDialog();

vijayan121

Mar 25th, 2008 12:31 am

Re: Open Same forminstance Multiple times

Form::ShowDialog()

shows the form as a modal dialog box. (the code following it is not executed until after the dialog box is closed.)
to show two instances of the same form:
a. create two instances of the Form (you seem to already have one instance, so create one more)
b. call

Form::Show()

on each of them.

Jennifer84

Mar 25th, 2008 3:16 pm

Re: Open Same forminstance Multiple times

Yes, that seems logic.. thanks. I have created 2 instances now like this where I try to open 2 at the same time with the button2_Click_3 below but the same thing is happening here again.
First form21instance is opened and then when I close this instance, form22instance is opened.
Any idéas what this could depend on ?

public ref class Form3 : public System::Windows::Forms::Form

{

        private: Form2 form21instance;

        private: Form2 form22instance;

}

private: System::Void button2_Click_3(System::Object^  sender, System::EventArgs^  e) 

 {

         this->form21instance.ShowDialog();

         this->form22instance.ShowDialog();

 }

Quote:

Originally Posted by vijayan121 (Post 568454)

Form::ShowDialog()

Form::Show()

on each of them.

Jennifer84

Mar 25th, 2008 7:56 pm

Re: Open Same forminstance Multiple times

I have also tried to open another form at the same time.
So in this case I will actually open 2 different "Forms" in my application.
(Form2 and Form4).
When pressing the button, first Form2 is opened and when closed, then Form4 will open.
I cant figure out what this is depending on, though I want both forms to open at the same time.

public ref class Form3 : public System::Windows::Forms::Form

{

        private: Form4 form4instance;

        private: Form2 form22instance;

}

private: System::Void button2_Click_3(System::Object^  sender, System::EventArgs^  e) 

{

         this->form22instance.ShowDialog();

         this->form4instance.ShowDialog();

}

mitrmkar

Mar 25th, 2008 8:18 pm

Re: Open Same forminstance Multiple times

Like vijayan121 already pointed out, you need to use the Show() method instead of the ShowDialog(). So try ...

private: System::Void button2_Click_3(System::Object^  sender, System::EventArgs^  e) 

{

         this->form22instance.Show();

         this->form4instance.Show();

}

Jennifer84

Mar 25th, 2008 8:51 pm

Re: Open Same forminstance Multiple times

Yes, I totally missed that. Ofcourse, .Show() works fine.
Thank you...

Quote:

Originally Posted by mitrmkar (Post 569085)

Like vijayan121 already pointed out, you need to use the Show() method instead of the ShowDialog(). So try ...

private: System::Void button2_Click_3(System::Object^  sender, System::EventArgs^  e) 

{

         this->form22instance.Show();

         this->form4instance.Show();

}

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