@Brandon: OP is talking about Windows Forms (see the link he has provided).
@Nacho108: I assume you have understood the basic concept of passing data between forms. Now coming to your issues: 1) In this article, every time I click the button it creates another instance of the forms. Ans: Because each time the button is clicked, new instance of form is created which is then shown. Solution #1: Use Application.OpenForms or create your own list of open forms. Iterate through them to see whether the form is still open, if it is then set focus on it. Solution #2: Use the class/module level variable of form and check the variable if Form still exists (i.e. NOT closed and disposed) then set focus on it. Solution #3: Use the "ShowDialog()" method of Form. 2) In my case I'm trying to access the main form (in this case a simple label) that was created by the visual studio and which is already opened, from another form that is opened after that. Ans: If you are trying to access the "First" form "Second" form then you need a reference of "First" form on "Second" form. Solution #1: If you have used the "ShowDialog()" method, then (after you call the "ShowDialog()" method) check the properties of "Second" form and make Changes on "First" form appropriately. Solution #2: If you have used the "Show()" method, then you need to use the delegates/events in order to notify the "First" form that some changes have occurred. Regards, Arsalan Tamiz On Feb 12, 8:25 pm, Nacho108 <[email protected]> wrote: > Hi! > > I'm having the c# typical beginner's problem (as far as I can read in > forums) of passing data between forms. > I was reading a lot about the subject but all the solutions I read are > about creating a NEW instance of a form and then use delegates, or > objects or class properties, etc. Like in this article: > > http://www.codeproject.com/KB/cs/pass_data_between_forms.aspx > > But the problems I'm having are: > 1) In this article, every time I click the button it creates another > instance of the forms. > 2) In my case I'm trying to access the main form (in this case a > simple label) that was created by the visual studio and which is > already opened, from another form that is opened after that. > > Maybe I'm missing very basic but I cannot understand how to face this > problem. > > Thanks in advance! > Nacho
