I just want to launch my development environment's default database as soon as possible.
What is the most straightforward solution to this issue?
I've had this issue before and found a solution. Using SQL authentication rather than Windows' is crucial. The best approach to set the default database is in this manner.
Try the following connection string:
<add name="MFCConnectionString" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\MFC.mdf;Initial Catalog=MFC;Integrated Security=false;User ID=sa;Password=123" providerName="System.Data.SqlClient" />
Keep in mind to set the integrated security parameter to false and the default database of the SA to MFC. Aside from that, sa is often deactivated, so turn it on and test it in sql server management studio first.