Hello Nadav, how are you?
I guess that the steps below are the idea of your test.
1) Login
2) If login didn't fail, keep with your tests on the page you are in
3) If login failed, use go to another page
To go to another page you can use the Browser.Navigate(URL) method.
To check if the login failed, you'll need to see if the page returns any message to the user or have any different behavior as usual.
For an example: let's suppose that when the login fails it returns a message, so you'll have to check if the message is VisibleOnScreen. If it is, go to the other page.
Something like that.