c# - How to call method from all opened forms

Question

I want call a method in the all opened forms

this code call MyUpdateFnc() on the last csutomer Opened Form:

if (Application.OpenForms["frmCustomer"] != null)
{
     (Application.OpenForms["frmCustomer"] as frmCustomer).MyUpdateFnc();
}

Several forms may be open.

Answer 1

You could get all forms of desired type using the Application.OpenForms.OfType<T> method. Next you need to iterate through the forms collection. For instance, using the foreach loop as follows:

foreach (frmCustomer frm in Application.OpenForms.OfType<frmCustomer>())
    frm.MyUpdateFnc();