ASP.NET normally stores the connection string information in the web.config file. They are contained as a child element under the connectionStrings element.
<connectionStrings>
<add name="ConnectionStringName" providerName="System.Data.SqlClient" connectionString="Server=localhost;Database=pubs;Trusted_Connection=true" />
</connectionStrings>
The name/value pairs in the connectionString attribute are specific to the providerName class. This examle is for a SQL Server connection. I'm not sure what all the MySQL takes from ASP.NET.
James