No. Your editbox (in the login form) is named "Username" so the string that is passed over to the verification script is "Username". Under this point of view, your script correctly has "username" but you need to change the editbox name in "username" with lowercase "u" .

And, why you inserting in the database only the username and not the password also ?

Also, as a good rule, the database fields should be the same as the php script and form variables. So, if you use "username" for the form and script, it would be wise that the database field for the username should be also "username" and not "Username" so that you will not get confused and make mistakes.

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