CommonDialog.ShowDialog Method (IWin32Window)
Runs a common dialog box with the specified owner.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
This version of the ShowDialog method allows you to specify a specific form or control that will own the dialog box that is shown. If you use the version of this method that has no parameters, the dialog box being shown would be owned automatically by the currently active window of your application.