Can C# app linked to MySql or any other free db tool?

Nowadays customers wanted to have low cost product , its highly difficult when its come to Microsoft product as all are costly.

Please let me know  can the .Net code can be communicated with MySQL or any other free DB so that customer need not to buy SQL server to make the application working.
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In short yes, this is possible. Everything you need is different connection string in your app... (plus MySQL installed plus MySQL data connector:

Of course, there are differences between MS SQL and MySQL data engines and not everything will work without update in C# (if you have some code already).

You may check some code samples, e.g. here:

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MySQL Server

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