Can VEM support for SQL Express?

I try to use ConnectionString="Server=(local);Database=DbName;Integrated Security=true;"

or

ConnectionString="Server=localhost\SQLEXPRESS;Database=DbName;Integrated Security=true;"

or

ConnectionString="Server=localhost\SQLEXPRESS;Initial Catalog=DbName;Integrated Security=true;"

Also cannot.

Need to login. SQL express no need to login. As we know, it uses windows authentication.

Then I try to read the source code.

I dont know how to remove the SqlCredentials because it related too much source files to be understood.

Please Help me