Weird situation about static file

I just change some style of css, but after runserver, the css is
nothing change.
I not only deleted the image file in the static folder, but deleted
whole static folder and the website still show the image and css.
only use in localhost, even doesn't deploy to server yet.
I don't know why that happened

Below is my setting

MEDIA_ROOT = 'C:/Python27/Lib/site-packages/django/bin/mysite/media'

# URL that handles the media served from MEDIA_ROOT. Make sure to use
a
# trailing slash.
# Examples: "http://media.lawrence.com/media/", "http://example.com/
media/"
MEDIA_URL = '/media/'

# Absolute path to the directory static files should be collected to.
# Don't put anything in this directory yourself; store your static
files
# in apps' "static/" subdirectories and in STATICFILES_DIRS.
# Example: "/home/media/media.lawrence.com/static/"
STATIC_ROOT = 'C:/Python27/Lib/site-packages/django/bin/mysite/static'

# URL prefix for static files.
# Example: "http://media.lawrence.com/static/"
STATIC_URL = '/static/'

# URL prefix for admin static files -- CSS, JavaScript and images.
# Make sure to use a trailing slash.
# Examples: "http://foo.com/static/admin/", "/static/admin/".
ADMIN_MEDIA_PREFIX = '/static/admin/'

# Additional locations of static files
STATICFILES_DIRS = (
r'C:\Python27\Lib\site-packages\django\bin\mysite\blog\static',
r'C:\Python27\Lib\site-packages\django\bin\mysite\media',
# Put strings here, like "/home/html/static" or "C:/www/django/
static".
# Always use forward slashes, even on Windows.
# Don't forget to use absolute paths, not relative paths.
)

Thanks!

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