opening a new form question

[hawk1ns]

Hello .

 

I have used this line of code to open a new form :

 

Dim frmdataform3 As New DataForm3()

frmdataform3.Show()

 

This works fine but i find if user re-clicks on the button another copy of the form opens , it allows several copies of the same form to be open ...

 

How can i get it so that only 1 copy is to be open at any one time ?

 

sort of like :

 

if form open = true then dont open

 

:)

 

Thanks for help

 

Regards

Carl

[xSwan]

Maybe if U declarar the frmdataform3 in the class and just run the frmdataform3.Show() then U open the, i think it will do it.

[PlausiblyDamp]

in the DataForm3 you could add some thing like

Private Shared _IsOpen As Boolean

Public Shared ReadOnly Property ISOpen() As Boolean
	Get
		Return _IsOpen
	End Get
End Property

 

in the form load event add

_IsOpen = True

 

and

in the form closed event add

_IsOpen = false

 

in the code that creates the form you can now use code similar to

if DataForm3.Isopen = false then
'donothing
else
'create form here
end if

[xSwan]

U sure that work, PlausiblyDamp ? :confused:

I dont think it work becurse he declarar the form in the function, and it will be declarar again as a new then he call the function again.

[mutant]

Declare your form as new on the top of your class, then from where ever you are calling just call it as

FormName.Show()

It will keep calling the same instance.

[Heiko]

Why don't you keep your own boolean flag to indicate, whether form3 is already open or not ?

 

Or search for "Singleton" in this forum. The singletin design patter makes sure that a class is only instantiated once.

[JCreationsInc]

Sounds like you should set a boolean data type and check it when the button is clicked to make sure the procedure doesnt open another window. :D