c# - mysql backup error using mysqldump -


i have mysql database name "booksdb" , want take backup file i'm using mysqldump

i write line below: c:\program files\mysql\mysql server 5.6\bin>

mysqldump -uroot -pbooks booksdb >  backupfile.sql

but got message :

access denied

where problem? , best way backup file? i'm using c# in project


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