How to migrate the database from SQL Server to MySQL

i am using sql server 2012 for my asp.net application , now my owner want this application not to be independent on SQL only , if a user wants to use mysql as a database then he could import all settings , tables e.t.c everything from SQL to MySQL and then use it the same way .... 

how to do that , also what steps i had to take for switching from sql to mysql ?

also tell me will mysql reduce my application efficiency ? and will it be harmful for my app ?