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juliodiz asked on

Form open more than 1 time c#

Hello. So i have a problem that my form more than 1 time.

How can i check if the form is open and if it opened i show?
.NET ProgrammingC#

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Alpesh Patel

8/22/2022 - Mon
Praveen Kumar

Dmitry G

If you are talking about the application in whole (main form) the following may help:

However, if you are talking about one of "secondary" forms, i.e. forms you are opening from your application, you may just check a reference to a form. You have to have an only variable to reference the form. If it is nothing - you create and open a new form. If not - show existing form.


        public static void OpenForm(Type frmType)
            bool bolCtl = false;
            foreach (Form form in Application.OpenForms)
                if (form.GetType().Equals(frmType))
                    bolCtl = true;

            if (!bolCtl)
                Form frm = (Form)Activator.CreateInstance(frmType);

        public static void LoadForm1()

            //Login _form1 = new Login();
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William Peck
Marcus Keustermans

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Alpesh Patel

Yes above both experts are right.