Hi,
From your description what i understood is you need to use SQL Server database in C# application.
For this you need to connect to Mysql Server.There are various ways to connect using connection strings.Please follow this link for more details :
http://www.connectionstrings.com/[
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Kindly let me know if you have any doubts or need more help.Will be happy to help more.
Thanks & Regards,
Zeeshan.