visual studio 2015 c# not break on unhandled exception in formload method

Question

my main method like these:

static void Main()
        {
            throw new Exception("dsfs");
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new ImageSettings());
        }

and when debug,it will be stop and tips like the following:

but when i try to throw a exception in form load method like these:

private void ImageSettings_Load(object sender, EventArgs e)
        {
            throw new Exception("sdfds");
            ...
}

visual studio won't stop and tip, it will directly exit the program. so how can i set the visual studio and let it also stop a unhandled exception in form lifecycle method ? (and handled exception i do not want to stop and break)

thanks in advance.