thank you..Let me try

thanks for reply.you code for Exit the application.But i need a form close automatically while we clicking for another form. Example I am working with Sales form and Also clicked for Invoice form.So we have two forms already opened state.I just need Sales form Close itself when i click for another form.in Clearly I need only two forms(Parent form and one child form)active at time. hope your reply

Dear All, I have simple project,has many forms.I just need to close all other forms if they active(Ex:Need to close Sales Form automatically When Clicking Invoice Form).I am not using MDI Forms.I just need an idea about Code How to implement this.