C # hides open windows, opens a detailed introduction to the login window

C # hides open windows, opens a detailed introduction to the login window

  FormCollection FC = application.openforms;//Gets the open window//loop hidden            if (FC! = NULL && FC. Count > 0)            {                foreach (Form window in FC)                {                    window. Hide ();                }            } Empty saved user information            cachehelper.curusername = "";            Cachehelper.curuserrole = -1;//Open the login window            frmlogin fl = new Frmlogin ();            Fl. Show ();

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