Obviously the connection string you are using will have to change and hopefully the dev team knew enough to store it in one place only (web.config). You can find the connection string syntax for MySQL at connectionstrings.com.
Also, in certain places you may need to alter the actual SQL commands used, particularly if you have used parameters as MS SQL uses @ to preceed the variable while MySql uses ?.
But, change the connection string and run it in debug mode and watch as the IDE shows you all of the changes you need to fix:)
hericles
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