my sql access denied in spite of granting privileges

I wanted to execute instructions to create and manipulate a data base so first I created a user as follow:

shell>cd program\xampp\mysql\bin;
shell>mysql -u root -h localhost
mariadb[(none)]>create user 'iw3htp@localhost'identified by 'sth';
grant all privileges on *.* to 'iw3htp@localhost';
flush privileges;

but when I want to execute instructions for creating and manipulating a database using source file or manually i face with error 1044 that says me "Access denied for user 'iw3htp'@'localhost'for database foo.

so whats wrong with this? what I have to do?