private DbContextOptionsBuilder <TDbContext> ChangeConnectionString(string tenantId) //where TDbContext : DbContext
{
// 1. Obtain Connection String from DataBaseManager and Add new DB name to
var connectionString = dataBaseManager.GetConnectionString(tenantId);
// 2. Create DbContextOptionsBuilder with new Database name
var contextOptionsBuilder = new DbContextOptionsBuilder <TDbContext>();
databaseType.SetConnectionString(contextOptionsBuilder, connectionString);
return(contextOptionsBuilder);
}