Boundary Testing of a Login page ..

Question

I couldn't find a relevant place to start this thread, could a mod please move it to the correct part, thank you.
Hi, 
my problem is that i am not sure whether i can boundary test my login page. It consists of a username inputs and password input. i understand that boundary testing can be done on the validation; such as only a username of 10 or less characters can be entered.
I also understand that normal data would be correct username and password and erroneous data would be blank filed(s).  The only thing i could think of for boundary testing would be correct username but incorrect password. however, this does not fit into
the definition of boundary data and now i am doubting if i can even carry it out on my system. 
any help would be great,
LTID

Answer 1

This is what i suspected, so does this means i will only be able to do normal (correct password and username) and erroneous (blank fields) on the login page.
Also, like you mentioned i have a register page. I have set textboxes to the maximum amount they can enter e.g. 10 characters for a username, but they have to have at least 1. so would this mean boundary testing would be 1 , 2 , 9 , 10, 11 and somewhere in
between? thanks for your help!
I don't know who you're addressing but if it's to me, then my point is that you need to enforce the rules (like the min/max number of characters, must include at least one upper and one lower case, or whatever else) when the user creates their login information.
For that you can use the .Validating event handler and set it up to enforce your rules there.
When the user logs in though, none of that applies. Your program will then just check that Username/Password combination (which should be instances of a class or structure) exists.
Still lost in code, just at a little higher level.