Cannot implicitly convert type 'System.Linq.IQueryable' to 'System.Data.Entity.DbSet'

Question

I\'m new in Linq and so I have these situation below.

Now below error during compilation, says Cannot implicitly convert type \'System.Linq.IQuery

Answer 1

var query = _db.Products.Where(x => true);
if (bool) {
  query = query.Where(p => p.Id == id);
}