Question

I created a DBContext Initializer:

Public Class DropCreateInitializer(Of T As DbContext)
    Inherits DropCreateDatabaseIfModelChanges(Of T)
    Protected Overrides Sub Seed(context As T)
        context.Database.ExecuteSqlCommand("CREATE INDEX IX_EXPLAN ON DBO.EXPLANS (PROGNAME, BIND_TIME, ACCESSNAME)")
    End Sub
End Class

What I dont understand is how to control the SQL server the new context will create a database on. It gets created on localhost/SQLEXPRESS.

Answer 1

The DbContext class optionally takes a connection string as a constructor parameter, which means you can programatically build up a connection string using the System.Data.SqlClient.SqlConnectionStringBuilder class.

Here is an example, in C# (I know your sample is in vb.net, but the translation should be simple enough, and this should illustrate the approach):

public class MyContext : DbContext
{
    public MyContext(string serverName, string databaseName)
        : base(GetConnectionString(serverName, databaseName))
    {

    }

    private static string GetConnectionString(string serverName, string databaseName)
    {
        var connectionBuilder = new SqlConnectionStringBuilder
        {
            DataSource = serverName,
            InitialCatalog = databaseName,
            IntegratedSecurity = true
        };

        var connectionString = connectionBuilder.ToString();
        return connectionString;
    }
}