Prevent from opening two instance of child form

[sethindeed]

I haven't been able to retrieve this information when searching on the forum...

My question is simple :

 

How can I prevent my program of opening two instance of the same child form ?

 

thx

[dynamic_sysop]

could you not use something like a boolean?

maybe Dim FrmLoaded as Boolean

then on start up the boolean = False and when you load the first instance of the child form the boolean = True ,

then if the boolean = true tell it not to be able to load a childform ( ie: if frmLoaded = True then exit sub , else frmChild = new form2 , frmChild.Show blabla )

[divil]

My suggestion would be to expand on dynamic_sysop's suggestion by making that boolean variable a static ("shared" in vb.net) member of the form class. Then in the form's constructor you could set it to true, and check it before creating a new instance of the class.

[sethindeed]

There is no possibilities to seek throughtout all open forms and notice if one of them is already opened ?

 

Something like For each frm in forms blabla ?

[wyrd]

Well, there is with a MDI form, but I don't think there is with a regular application aside from using System.Diagnostics.Process.GetProcessesByName() and GetProcessById() methods.

[Nerseus]

The Forms collection from VB6 is no longer available. As wyrd mentioned, an MDI form knows about it's children, but looping through them all is not the .NET way - I'd go with divil's and dynamic_sysop's suggestions.

 

-Nerseus

[sethindeed]

OK then

I will use this method

Thanx guys

[dynamic_sysop]

i always like the blabla explanation lol.

the boolean has been a god send in vb6 for me so i carried it over and have used it for various instances in .net already.

anyway glad to have finally been of assistance to someone on here instead of me asking a question.

[EliCat]

My collegue and I were looking into a similar problem and he ran across this online:

 

 

http://archive.devx.com/dotnet/discussions/043002/accesscontrols.asp

 

 

 

Maybe you can get some tips from it as well.

 

 

 

 

 

 

 

BTW lovely signature dynamic_sysop .. congrats. :)

[dynamic_sysop]

ty elicat :) , quite ironic really, cuz i run a chat room and met my wife through chat, her nickname was "cat" and i'm originally from holland not uk ( almelo to be precise )