how can i get the event from filesave dialog

I want to save the 3D part with the same name and same dirctory, so i have one add-in and load the windows SaveFileDialog ,

then how can i get the event when i click the file save button ?

here is my code:

Public powerSave As Microsoft.Win32.SaveFileDialog

     .....

powersave.title= "test"

        powerSave.ShowDialog()

SolidworksApi macros