Check if open is already open

[soneliso]

How to check if the form is already open, so that it cannot be duplicatly openned

[fang_eric]

do it with the form load event that like this: if (Process.GetProcessesByName(yourprocessname).Length >=1){ MessageBox.show("already opened!"); return; }

[Giorgi Dalakishvili]

I think he meant some form he has in his application, not the application itself

[fang_eric]

if that is like you said, that needs to use Mutex.

[soneliso]

Thanks but my problem i want to close form1 before opening form2

[soneliso]

Yes is like that

[Nouman Bhatti]

Use singleton design pattern and it'll solve your problem for example u want form1 to be checked if it's already opened take a object of form1 with in your form1 class make the constructor private of your form1 class make a public static method with in that method check if the object is null or not if null assign a new instance of your form1 and if not null then return the already initialized instance

[Aron Miserda]

Best way to solve this is to to make your class constructor private and put static method that returns reference to only instance of your class Code example: class Example { private static Example THIS = null; public static Example CREATE_FORM() { if (THIS == null) THIS = new Example(); return THIS; } private Example() { } }

[AFSEKI]

if( myForm != null && !myForm.Disposing && myForm.IsHandleCreated) return; else myForm.Show();